Patent Publication Number: US-2023147823-A1

Title: Control Techniques for Multiple Alternating-Input Devices

Description:
TECHNICAL FIELD 
     This disclosure relates generally to the field of control systems, and more specifically relates to control systems for devices used in flexible displays. 
     BACKGROUND 
     Development of flexible displays has progressed in recent years. Flexible displays can incorporate devices that are suitable for attachment to fabric, curved walls, or other surfaces that can be curved. In some cases, devices for flexible displays can be physically small, or require relatively low levels of voltage. In addition, devices for flexible displays can be independently controllable, such as devices that can be individually activated via a control signal or other input. 
     In some cases, contemporary control systems for flexible display devices may be inadequate for controlling larger quantities of devices. For example, contemporary control systems may require rigid circuit boards or other inflexible elements to mount multiple devices. The rigidity of such contemporary control systems can be unsuitable for clothing or other flexible items. In addition, contemporary control systems may be incapable of independently controlling a larger quantity of flexible display devices. For example, a contemporary control system can utilize individual switch components to manage a relatively small number of devices, such as one or two per switch. Such contemporary systems that utilize individual switch components may be expensive to manufacture or maintain. In addition, contemporary systems that utilize individual switch components may be excessively heavy or otherwise uncomfortable to wear, and thus could also be unsuitable for clothing or other flexible items. 
     SUMMARY 
     According to certain embodiments, a control system for independent alternating-input (“IAI”) devices may include an IAI device and an analog switch component. The IAI device includes a first voltage input point and a second voltage input point. The analog switch component includes a first input connection point, a first switch, a second input connection point, and a second switch. The first switch is configured to selectively connect and disconnect the first input connection point and the first voltage input point. the second switch is configured to selectively connect and disconnect the second input connection point and the second voltage input point. The analog switch component is configured to, in a first state of the IAI device, provide a first voltage signal to the first voltage input point via the first switch. The analog switch component is further configured to, in the first state of the IAI device, provide a second voltage signal to the second voltage input point via the second switch. The analog switch component is further configured to, in a second state of the IAI device, provide the first voltage signal to the first voltage input point via the first switch and to the second voltage input point via a third switch of the analog switch component. 
     According to certain embodiments, a control system for IAI devices may include an IAI device, a bus-generating component, and an analog switch component. The IAI device includes a first voltage input point and a second voltage input point. The bus-generating component includes a first signal output point configured to provide a first voltage signal. The first signal output point and the first voltage input point have an electrical connection. The bus-generating component further includes a second signal output point configured to provide a second voltage signal. The analog switch component includes a first input connection point and a second input connection point. The second input connection point and the second signal output point of the bus-generating component are electrically connected. The analog switch component further includes a switch that is configured to selectively connect and disconnect the second input connection point and the second voltage input point of the IAI device. The bus-generating component is configured to provide the first voltage signal to the first voltage input point via the electrical connection. The analog switch component is configured to, responsive to a digital control signal indicating a first state, close the switch such that the second voltage signal is provided to the second voltage input point via the switch. The analog switch component is further configured to, responsive to the digital control signal indicating a second state, open the switch such that the second voltage input point is electrically disconnected from the switch. 
     According to certain embodiments, a control system for IAI devices may include a first IAI device, a second IAI device, and an analog switch component. The first IAI device has a first voltage input point and a second voltage input point. The second IAI device has a third voltage input point and a fourth voltage input point. The second voltage input point and the third voltage input point are electrically connected. The analog switch component includes a first input connection point, a second input connection point, a first switch, a second switch, and a third switch. The first switch is configured to selectively connect and disconnect the first input connection point to the second voltage input point and the third voltage input point. The second switch is configured to selectively connect and disconnect the second input connection point to the second voltage input point and the third voltage input point. The third switch is configured to selectively connect and disconnect the first input connection point to the fourth voltage input point. The first IAI device is configured to receive a first voltage signal via the first voltage input point. The analog switch component is configured to, responsive to a digital control signal indicating that the first IAI device has a first state, open the first switch and close the second switch such that a second voltage signal is provided to the second voltage input point and the third voltage input point via the second switch. The analog switch component is further configured to, responsive to the digital control signal indicating that the second IAI device has a same state as the first state of the first IAI device, close the third switch such that the first voltage signal is provided to the fourth voltage input point via the third switch. 
     These illustrative embodiments are mentioned not to limit or define the disclosure, but to provide examples to aid understanding thereof. Additional embodiments are discussed in the Detailed Description, and further description is provided there. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Features, embodiments, and advantages of the present disclosure are better understood when the following Detailed Description is read with reference to the accompanying drawings, where: 
         FIG.  1    is a diagram depicting an example of a multi-device control system in which multiple IAI devices can be controlled, according to certain embodiments; 
         FIG.  2    is a diagram depicting example voltage signals provided by a multi-device control system, according to certain embodiments; 
         FIG.  3    is a diagram depicting an example of a multi-device control system configured to control multiple IAI devices utilizing a 1:1 configuration, according to certain embodiments; 
         FIG.  4    is a diagram depicting an example of a multi-device control system configured to control multiple IAI devices utilizing a 2:1 configuration, according to certain embodiments; 
         FIG.  5    is a flow chart depicting an example of a process for providing voltage signals to multiple IAI devices, such as in a multi-device control system with a 2:1 configuration, according to certain embodiments; 
         FIG.  6    is a diagram depicting an example of a multi-device control system in which voltage signals generated via a bus-generating component are provided to one or more analog switch components in a 4:1 configuration, according to certain embodiments; 
         FIG.  7    is a diagram depicting an example of a multi-device control system in which voltage signals generated via a bus-generating component are provided to one or more analog switch components in an 8:1 configuration, according to certain embodiments; 
         FIG.  8    is a flow chart depicting an example of a process for providing voltage signals to multiple IAI devices, such as in a multi-device control system with a 4:1 configuration or an 8:1 configuration, according to certain embodiments; 
         FIG.  9    is a diagram depicting an example of a multi-device control system configured to control multiple IAI devices utilizing a neighbor control configuration, according to certain embodiments; and 
         FIG.  10    is a flow chart depicting an example of a process for providing voltage signals to multiple IAI devices, such as in a multi-device control system with a neighbor control configuration, according to certain embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     As discussed above, prior techniques for controlling devices used in flexible displays include rigid or heavy materials, and are not physically suitable for use in wearable electronics or curved surfaces. In addition, prior techniques for controlling devices used in flexible displays are limited in how many devices can be independently controlled. Contemporary control systems that require individual switch components for each device are relatively expensive to manufacture, and can also be expensive or otherwise troublesome to maintain, requiring testing or replacement of a relatively large number of switch components per flexible display. 
     Certain embodiments described herein provide control systems for multiple devices that can be included in flexible displays. Multi-device control systems described herein can provide independent control of multiple devices via a particular switch component. Controlling multiple devices via a particular switch device can reduce weight and expense associated with flexible displays. In addition, multi-device control systems can increase the quantity of devices that may be attached to a flexible display, improving configurability of the flexible display. In some cases, increased configurability provided via a multi-device control system can improve a user experience for the flexible display, such as by expanding the quantity or type of devices used in creative expression. For example, if the flexible display is included in a wearable electronics item, such as a fashion item, a fashion designer or owner of the wearable item electronics could create relatively complex visual patterns (or other interactions) by utilizing a larger quantity of controllable devices. 
     The following examples are provided to introduce certain embodiments of the disclosed techniques. In this example, a multi-device control system includes at least one analog switch component and multiple independent alternating-input (“IAI”) devices. The multi-device control system and the multiple IAI devices could be included in a flexible display, such as a wearable electronics clothing item that includes the multiple IAI devices. The multi-device control system can control the IAI devices to, for instance, provide a visual pattern, generate sound, or other controllable modifications of the example clothing item. The example analog switch component is configured to receive at least one voltage signal, such as a voltage signal of 5V, 7V, 15V, 30V, or another level that is suitable for IAI devices. In some cases, the one or more voltage signals include alternating voltage levels, such as a signal bus or an inverted signal bus. 
     Continuing with this example, the analog switch component includes multiple switches. Each of the switches is controllable responsive to a digital control signal received by the analog switch component. In addition, each of the IAI devices is electrically connected to one or more of the switches. For example each IAI device could have respective voltage input points that are electrically connected to one or more switches. In the example multi-device control system, the analog switch component individually controls each of the multiple IAI devices via the switches that are respectively connected to each IAI device. Responsive to the digital control signal, the analog switch component modifies the switches, e.g., opening or closing one or more switch. Based on a particular IAI device being electrically connected to opened or closed switches, one or more voltage signals are received by (or withheld from) the particular device. For example, if the example multi-device control system has a 4:1 configuration, the particular IAI device includes a first voltage input point that receives a signal bus. The particular IAI device also includes a second voltage input point that is electrically connected to at least two switches of the analog switch component. In the example 4:1 configuration, the analog switch component can modify the two switches such that the second voltage input point receives the signal bus or an inverted signal bus. In this example, the particular IAI device could be activated responsive to receiving the signal bus at the first voltage input point and the inverted signal bus, via one of the two switches, at the second voltage input point. In addition, the particular IAI device could be deactivated responsive to receiving the signal bus at the first voltage input point and also at the second voltage input point, via another of the two switches. The analog switch component can also independently control additional ones of the multiple IAI devices, via the switches electrically connected to the additional devices. 
     In some implementations described herein, an IAI device includes a device suitable for wearable electronics. Examples of IAI devices for wearable electronics include light-emitting diodes (“LEDs”), polymer dispersed liquid crystal (“PDLC”) devices, polychromic material devices, speakers or other sound devices, motors (e.g., low-voltage motors), solenoids (e.g., electromagnets), or any other type of device suitable for including in a flexible display or other flexible arrangements. Additional information related to PDLC devices is described in U.S. Pat. No. 10,935,861 issued Mar. 2, 2021, entitled Modular Reflective Light-Diffused Devices, the entirety of which is incorporated herein by reference. An IAI device is configured to receive, for example, at least one voltage signal with alternating voltage levels, such as a square wave, a triangle wave, a sinusoidal wave, a non-periodic digital signal (e.g., rising or falling based on a control signal), or other types of voltage signals that alternate levels. In some cases, an IAI device is configured to receive a voltage signal that alternates at a particular frequency, such as at about 50 Hz. An IAI device can operate based on a voltage signal at positive and/or negative 1.5V, 3.3V, 5V, 7V, 15V, 30V, 60V, or another suitable level of relatively low voltage (e.g., within a range of about +60V to about −60V). In some cases, a particular range of relatively low voltages may be suitable for a particular type of flexible display. For example, a voltage range of about +60V to about −60V may be suitable for a flexible display on an architectural wall. In addition, a voltage range of about +15V to about −15V may be suitable for a flexible display on a wearable electronics item. 
     Implementations described herein are generally described in relation to wearable electronics, but example multi-device control systems as described herein can be utilized in other configurations. For example, an example multi-device control system could be used to control multiple IAI devices in an architectural space (e.g., on curved walls), on artistic installations, in a garden environment, or other implementations that include flexible, multi-planar (e.g., polyhedrons), or irregularly shaped surfaces. 
     Referring now to the drawings,  FIG.  1    is a diagram depicting an example of a multi-device control system  100  in which multiple IAI devices can be controlled. The multi-device control system  100  includes at least one controller  105  and a voltage source  110 . In addition, the multi-device control system  100  includes one or more analog switch components, such as an analog switch component  120  or an analog switch component  160 , and one or more IAI devices, such as a group of IAI devices  140  or a group of IAI devices  180 . Each of the device groups  140  and  180  includes multiple IAI devices, such as between  2  to  8  IAI devices. In the multi-device control system  100 , the IAI devices  140  are connected to the analog switch component  120  and the IAI devices  180  are connected to the analog switch component  160 . In some cases, the multi-device control system  100  includes one or more additional analog switch components connected to additional groups of IAI devices. For example, one or more additional analog switch components may be connected in a serial configuration (e.g., “daisy chain”) to the analog switch component  160 . In some cases, each additional analog switch component may be connected to a respective group of additional IAI devices. An example analog switch component could be a serially controlled octal SPST (“single-pull single-throw”) switch component, such as a component ADG1414, but other types of analog switch components may be suitable. 
     In  FIG.  1   , the controller  105  is a microprocessor (or other suitable control component) that is configured to generate a control signal. The control signal may be a digital control signal, such as a digital control signal that utilizes synchronous communication protocol. An example protocol for a digital control signal includes a serial peripheral interface (“SPI”) communication protocol, but other suitable protocols for digital control signals may be utilized. In the multi-device control system  100 , one or more of the analog switch components  120  or  160  may receive a digital control signal from the controller  105 . In some cases, a particular digital control signal is provided from a particular analog switch component to an additional analog switch component. For example, the digital control signal from the controller  105  is provided from the analog switch component  120  to the analog switch component  160  via a control line  103 . In addition, the analog switch component  160  can be configured to provide the digital control signal to an additional analog switch component in the multi-device control system  100 , such as via an additional control line. In some cases, a digital control signal is generated or repeated by one or more components in the multi-device control system  100 , such as applying signal conditioning techniques to a received digital control signal that has fallen below a threshold voltage level. For example, an example multi-device control system could include one or more components configured to refresh a digital control signal, store the digital control signal in a buffer, or other suitable configurations for signal conditioning of a digital control signal. In some implementations, a digital control signal protocol that can be signal-conditioned by an analog switch component (or other component) may improve manufacturability or reduce costs of a multi-device control system, such as by reducing a number of controllers or signal-repeating components included in the example multi-device control system.  FIG.  1    is described as having a particular digital control signal from the controller  105 , but other implementations are possible. For example, a multi-device control system may include multiple controllers configured to provide respective digital control signals. In addition, a multi-device control system may include a particular controller that is configured to provide multiple digital control signals, or a digital control signal having multiple components (e.g., time division, frequency division) that are received and/or interpreted by respective analog switch components. In addition, a multi-device control system may receive a digital control signal from an additional component, such as via an antenna configured to communicate wirelessly with a controller located remotely from the multi-device control system. 
     In  FIG.  1   , the voltage source  110  is configured to provide one or more voltage signals to at least one analog switch component in the multi-device control system  100 . For example, the voltage source  110  provides a first voltage signal, such as a positive voltage level, and a second voltage signal, such as a negative voltage level, to one or more of the analog switch components  120  and  160 . The analog switch components  120  and  160  may receive the first and second voltage signals via a particular electrical connection (e.g., a single input) or via multiple connections (e.g., an input for the first voltage signal and an additional input for the second voltage signal). In some cases, the first and second voltage signals respectively have a constant (or substantially constant) level, such as about +15V and −15V.  FIG.  1    describes the voltage source  110  as providing +/−15V, but other implementations are possible, such as voltage levels of +5V and −5V, +30 V and −30V, +15V and 0V, or other suitable levels for a voltage signal. In some cases, a multi-device control system may include a voltage source that provides an alternating voltage signal, such as a square wave, a triangle wave, a sinusoidal wave (e.g., AC waveform), or another alternating voltage signal that is suitable for IAI devices controllable by the example multi-device control system. 
       FIG.  1    depicts the analog switch components  120  and  160  as being configured to receive voltage signals from the voltage source  110 , but other implementations are possible. For example, a multi-device control system can include a signal-generating analog switch component, such as a particular analog switch component that generates at least one voltage signal (e.g., a square wave signal) based on one or more voltage signals received from a voltage source. In some cases, one or more additional analog switch components can receive the at least one voltage signal from the signal-generating analog switch component, as described in regard to, at least,  FIGS.  6 - 7   . 
     In some implementations, each of the analog switch components  120  and  160  provides control voltage signals to multiple IAI devices. The control voltage signals to the IAI devices may be based on the one or more voltage signals received by the analog switch components  120  and  160 . For example, the analog switch component  120  provides, to each IAI device in the group of devices  140 , a respective set of control voltage signals. A particular IAI device in the group of devices  140  receives, for instance, a first voltage signal via a first voltage input point and a second voltage signal via a second voltage input point. In addition, each additional IAI device in the group of devices  140  receives from the analog switch component  120  a respective voltage signal and additional voltage signal via respective voltage input points. In addition, the analog switch component  160  provides, to each IAI device in the group of devices  180 , a respective set of control voltage signals. A particular IAI device in the group of devices  180  receives, for instance, a first voltage signal via a first voltage input point and a second voltage signal via a second voltage input point. In addition, each additional IAI device in the group of devices  180  receives from the analog switch component  160  a respective voltage signal and additional voltage signal via respective voltage input points. 
     In some cases, each of the analog switch components  120  and  160  provides the respective voltage signals to each of the IAI devices  140  and  180  responsive to the digital control signal from the controller  105 . For instance, the digital control signal includes data for each of the IAI devices  140  and  180 , such as data indicating whether each particular IAI device is activated or deactivated. In some cases, the data in the digital control signal can indicate an address (or other identification data) for each of the IAI devices  140  and  180 . In addition, the data in the digital control signal can indicate whether one or more switches in the analog switch components  120  and  160  are activated or deactivated (e.g., open or closed). For example, the digital control signal can include data indicating activation for a set of switches associated with a particular IAI device in the group of devices  140 , such as a set of switches electrically connected to voltage input points of the particular device. Each switch in the set of switches can be configured to selectively connect and disconnect a voltage input point of the particular IAI device with a respective input connection point of the analog switch components  120  or  160 . Responsive to the digital control signal, for example, the analog switch component  120  activates the set of switches for the particular IAI device, such that the particular device receives the input voltage signals via the voltage input points. In addition, the particular IAI device activates (or deactivates) responsive to receiving the control voltage signals. States of activation or deactivation may include powering on, powering off, adjusting an output level (e.g., adjust volume, modify color), entering a standby state, or other suitable types of operation for an IAI device. 
       FIG.  1    describes the IAI devices  140  and  180  as receiving the control voltage signals via switches in the analog switch components  120  and  160 , but other implementations are possible. For example, a multi-device control system can include a multiplexer component, a component having one or more single-pull multi-throw relays, or other components suitable to provide a voltage control signal to an IAI device via an electrical connection. 
       FIG.  2    is a diagram depicting example voltage signals that are provided by a multi-device control system, such as the multi-device control system  100 . In some cases, the example voltage signals are used to provide control to one or more IAI devices, such as an IAI device  240 . The IAI device  240  is electrically connected to an analog switch component, such as a particular one of the IAI devices  140  that is connected to the analog switch component  120 . 
     In  FIG.  2   , a first voltage signal V 1  and a second voltage signal V 2  include respective voltage levels. The respective voltage levels may alternate between (or otherwise include) a relatively higher voltage V+ and a relatively lower voltage V− (e.g., about +15V to about −15V, or other suitable voltages). For example, first the voltage signal V 1  includes the lower voltage V− at time periods t 1 , t 3 , t 5 , and t 7 , and includes the higher voltage V+ at time periods t 2 , t 4 , and t 6 . In addition, the second voltage signal V 2  includes the higher voltage V+ at the time periods t 1 , t 3 , t 5 , and t 7 , and includes the lower voltage V− at the time periods t 2 , t 4 , and t 6 . In some cases, the voltage signals V 1  and V 2  alternate at a particular frequency, such as a frequency of about 50 Hz. In some implementations, a voltage signal of about 50 Hz may reduce or prevent degradation of some types of IAI devices, such as a PDLC device. For convenience, and not by way of limitation,  FIG.  2    depicts waveforms associated with V 1  using a solid line and waveforms associated with V 2  using a dotted line. 
     In some implementations, the first voltage signal V 1  and the second voltage signal V 2  are generated by one or more components of the example multi-device control system, such as by an analog switch component. In some cases, the example analog switch component generates the voltage signals V 1  and V 2  by activating or deactivating (e.g., opening or closing) multiple switches that are included in the example analog switch component. For example, each of the analog switch components  120  and  160  generates the voltage signals V 1  and V 2  by opening and closing switches that are electrically connected to the voltage source  110 . In some cases, the voltage signals V 1  and V 2  are generated by a signal-generating analog switch component. The example signal-generating analog switch component can be configured to provide the voltage signals V 1  and V 2  to one or more additional components in a multi-device control system, such as via a signal bus or an inverted signal bus. 
     In some implementations, the first voltage signal V 1  and second voltage signal V 2  are provided to the IAI device  240 , such as via a first voltage input point  241  or a second voltage input point  242 . The voltage input points  241  and  242  are electrically connected to, for example, a set of switches included in the analog switch component  120 . In addition, the analog switch component  120  modifies switch states (e.g., activates or deactivates) of the set of switches to generate a temporal combination of the voltage signals V 1  and V 2 . The combinations of the voltage signals V 1  and V 2  generate a first control voltage signal  201  and a second control voltage signal  202 . For example, the analog switch component  120  modifies switch states such that the first control voltage signal  201  includes the voltage signal V 1  during time periods ti through t 7 . In addition, the analog switch component  120  modifies switch states such that the second control voltage signal  202  includes the voltage signal V 2  during time periods ti through t 4  and includes the voltage signal V 1  during time periods t 5  through t 7 . Other combinations of voltage signals may be generated via additional suitable modifications to switch states. 
     In  FIG.  2   , the first control voltage signal  201  is received by the IAI device  240  via the voltage input point  241 . The second control voltage signal  202  is received by the IAI device  240  via the voltage input point  242 . In some cases, the IAI device  240  enters an activated state  210  during time periods t 1  through t 4 , responsive to the control voltage signals  201  and  202 . For example, the IAI device  240  may enter the activated state  210  responsive to receiving a voltage differential across the voltage input points  241  and  242 , such as a differential between the different voltage levels of signals V 1  and V 2  during the time periods t 1  through t 4 . In addition, the IAI device  240  enters a deactivated state  215  during time periods t 5  through t 7 , responsive to the control voltage signals  201  and  202 . For example, the IAI device  240  may enter the deactivated state  215  responsive to a reduced or absent voltage differential (e.g., similar voltage levels) across the voltage input points  241  and  242 , such as the similar voltage levels of signal V 1  during the time periods t 5  through t 7 . In some cases, the IAI device  240  is controlled, e.g., activated or deactivated, via a presence or absence of a sufficient voltage differential across the voltage input points  241  and  242 , such as differentials between the voltage levels included in the control voltage signals  201  and  202 . In addition, the analog switch component  120  controls the IAI device  240  individually, such that the IAI device  240  can have different, identical, or partly related activity as compared to other IAI devices, e.g. in the group of devices  140 . As used herein, a voltage differential that is “sufficient” is a voltage differential with a value that activates a IAI device receiving the voltage differential across multiple voltage input points. In some cases, particular types of IAI devices may activate responsive to a sufficient voltage differential with a particular value. In addition, particular types of IAI devices may activate with particular responses (e.g., faster/slower activation, color selection activation) based on a value of a sufficient voltage differential. For example, a PDLC device could activate responsive to a sufficient voltage differential of about 30 V. In addition, a speaker device could activate at a first frequency responsive to a sufficient voltage differential of about 20 mV and at a second frequency responsive to a sufficient voltage differential of about 5 mV. Other IAI devices (or types of IAI devices) with additional sufficient voltage differentials may be utilized. 
     In some cases, the example multi-device control system configures one or more switches such that the IAI device  240  does not receive a voltage signal. For example, the analog switch component  120  could open one or more switches such that at least one of the voltage input points  241  or  242  are electrically disconnected, e.g., are allowed to float. In some cases, one or more voltage input points of the IAI device  240  is allowed to float subsequent to the deactivated state  215 . For instance, following deactivation (e.g., powering off) of the IAI device  240 , switches in the analog switch component  120  may be opened such that one or more of the control voltage signals  201  or  202  is withheld from the voltage input points  241  or  242 . 
     In some implementations, one or more of the voltage signals V 1  and V 2  or the control voltage signals  201  or  202  are modified via pulse width modulation (“PWM”). For instance, an example multi-device control system could include a PWM component configured to modify a voltage signal provided by a voltage source or an analog switch component. In addition, an analog switch component could modify switch states such that a control voltage signal has a particular voltage level for relatively shorter or longer amounts of time. In some cases, an IAI device modifies an output responsive to receiving a PWM-modified control voltage signal, such as activating a motor or light-emitting component for relatively shorter or longer periods of time. 
     1:1 Configuration 
       FIG.  3    is a diagram depicting an example of a multi-device control system  300  in which an analog switch component  320  is configured to provide control voltage signals to a particular IAI device, such as an IAI device  340 . The IAI device  340  includes a first voltage input point  341  and a second voltage input point  342 . The multi-device control system  300  includes a controller  305 . In some cases, for convenience and not by way of limitation, the multi-device control system  300  is referred to as a 1:1 configuration, such as a configuration in which a particular analog switch component provides control for a single IAI device. In some cases, one or more additional analog switch components are included in the multi-device control system  300 , such as additional analog switch components connected (e.g., daisy-chained) to the analog switch component  320 . 
     In  FIG.  3   , the analog switch component  320  is an octal switch component including eight switches, including switches  331 ,  332 ,  333 ,  334 ,  335 ,  336 ,  337 , and  338 . In the analog switch component  320 , the switch  331  has an input connection point  311   a  and an output connection point  311   b.  In addition, the switch  332  has respective input and output connection points  312   a  and  312   b,  the switch  333  has respective input and output connection points  313   a  and  313   b,  the switch  334  has respective input and output connection points  314   a  and  314   b,  the switch  335  has respective input and output connection points  315   a  and  315   b,  the switch  336  has respective input and output connection points  316   a  and  316   b,  the switch  337  has respective input and output connection points  317   a  and  317   b,  and the switch  338  has respective input and output connection points  318   a  and  318   b.    
     Each of the switches  331 - 338  can be configured to receive, via respective ones of the input connection points  311   a - 318   a,  one or more voltage signals. For instance, the input connection points  311   a  and  314   a  are configured to receive a first voltage signal V A . In addition, the input connection points  312   a  and  315   a  are configured to receive a second voltage signal V B . Further, the input connection points  313   a  and  316   a  are configured to receive a third voltage signal V C . In  FIG.  3   , one or more of the voltage signals V A , V B , or V C  may be received from a voltage source, such as the voltage source  110  described in regards to  FIG.  1   . For example, the voltage signal V A  is a constant (or substantially constant) first voltage level, such as +15V or another suitable voltage level. In addition, the voltage signal V B  is a constant (or substantially constant) second voltage level, such as 0V or another suitable voltage level. Further, the voltage signal V C  is a constant (or substantially constant) third voltage level, such as −15V or another suitable voltage level.  FIG.  3    describes the voltage signals V A , V B , and V C  as being constant or substantially constant, but other implementations are possible. For example, a multi-device control system in a 1:1 configuration could receive voltage signals that alternate levels during multiple time periods, such as the voltage signals V 1  and V 2  described in regard to  FIG.  2   . In  FIG.  3   , one or more of the switches  337  or  338  (and the respective input and output connection points) could be electrically disconnected, or could be used to selectively connect or disconnect additional components, e.g., providing the voltage signals V A , V B , V C , or an additional voltage signal. 
     In  FIG.  3   , the IAI device  340  is configured to receive at least one of the voltage signals V A , V B , or V C  at each respective voltage input point, such as via the switches  331 - 338 . For instance, the voltage input point  341  is electrically connected to the output connection points  311   b,    312   b,  and  313   b.  The IAI device  340  is configured to receive, at the voltage input point  341 , one or more of the voltage signals V A , V B , and V C  via, respectively, the switches  331 ,  332 , and  333 . In addition, the voltage input point  342  is electrically connected to the output connection points  314   b,    315   b,  and  316   b.  The IAI device  340  is configured to receive, at the voltage input point  342 , one or more of the voltage signals V A , V B , and V C  via, respectively, the switches  334 ,  335 , and  336 . 
     In the multi-device control system  300 , the controller  305  provides to the analog switch component  320  a digital control signal, such as a signal using an SPI communication protocol. Responsive to the digital control signal from the controller  305 , the analog switch component  320  modifies states of one or more of the switches  331 - 338 , such as to provide one or more control voltage signals to the IAI device  340  via one or more of the switches  331 - 336 . For example, responsive to the digital control signal indicating a first state (e.g., activated) for the IAI device  340 , the analog switch component  320  closes the switches  331  and  336 , such that the IAI device receives the voltage signal V A  (e.g., +15V) via the voltage input point  341  and the voltage signal V C  (e.g., −15V) via the voltage input point  342 . In addition, responsive to the digital control signal indicating a second state (e.g., deactivated) for the IAI device  340 , the analog switch component  320  closes the switches  332 , and  335  such that the IAI device  340  receives the voltage signal V B  (e.g., 0V) via the voltage input points  341  and  342 . In some cases, the analog switch component  320  modifies one or more of the switches  331 - 336  during the first state, such as opening or closing the switches  331  and  333  (or the switches  334  and  336 ) in an alternating pattern at about 50 Hz. Based on the modified states of the switches  331  and  333 , the analog switch component  320  provides the voltage signals V A  or V C , e.g., in an alternating pattern, to the voltage input point  341 . In addition, based on the modified states of the switches  334  and  336 , the analog switch component  320  provides the voltage signals V A  or V C , e.g., in an alternating pattern, to the voltage input point  342 . In some cases, during the first state, the analog switch component  320  opens the switches  332  and  335 . In some cases, during the second state, the analog switch component  320  opens the switches  331 ,  333 ,  334 , and  336 . 
     In some cases, the analog switch component  320  modifies states of the switches  331 - 336  such that the voltage input points  341  and  342  receive control voltage signals, such as described in regards to  FIG.  2   . For example, the IAI device  340  activates (e.g., powers on) responsive to receiving control voltage signals that generate a voltage differential across the points  341  and  342 , such as receiving, at time periods in an alternating signal pattern, the voltage signal V A  via the switches  331  and  334  and the voltage signal V C  via the switches  333  and  336 . In addition, the IAI device  340  deactivates (e.g., powers off) responsive to receiving similar control voltage signals (e.g., a voltage differential that is not sufficient for activation) via the points  341  and  342 , such as receiving the voltage signal V B  (e.g., 0V) via the switches  332  and  335 . In some cases, the IAI device  340  deactivates responsive to one or more of the voltage input points  341  or  342  being allowed to float (e.g., electrically disconnected). In  FIG.  3   , the analog switch component  320  is described as providing voltage control signals via one or more of the switches  331 - 338 , but other implementations are possible, such as a multi-device control system that provides one or more voltage control signals via a single-pull multi-throw relay, a multiplexer, or another suitable component. In some cases, the multi-device control system  300  could include a PWM component configured to modify one or more of the voltage signals V A , V B , or V C . In addition, the example analog switch component could modify switch states such that one or more of the voltage signals V A , V B , or V C  has a particular voltage level for relatively shorter or longer amounts of time. 
     2:1 Configuration 
       FIG.  4    is a diagram depicting an example of a multi-device control system  400  in which an analog switch component  420  is configured to provide control voltage signals to multiple IAI devices, including an IAI device  440  and an IAI device  445 . The IAI device  440  includes a first voltage input point  441  and a second voltage input point  442 . The IAI device  445  includes a first voltage input point  446  and a second voltage input point  447 . The multi-device control system  400  includes a controller  405 . In some cases, for convenience and not by way of limitation, the multi-device control system  400  is referred to as a 2:1 configuration, such as a configuration in which a particular analog switch component provides control for two or fewer IAI devices. In some cases, one or more additional analog switch components are included in the multi-device control system  400 , such as additional analog switch components connected (e.g., daisy-chained) to the analog switch component  420 . 
     In  FIG.  4   , the analog switch component  420  is an octal switch component including eight switches, including switches  431 ,  432 ,  433 ,  434 ,  435 ,  436 ,  437 , and  438 . In the analog switch component  420 , the switch  431  has an input connection point  411   a  and an output connection point  411   b.  In addition, the switch  432  has respective input and output connection points  412   a  and  412   b,  the switch  433  has respective input and output connection points  413   a  and  413   b,  the switch  434  has respective input and output connection points  414   a  and  414   b,  the switch  435  has respective input and output connection points  415   a  and  415   b,  the switch  436  has respective input and output connection points  416   a  and  416   b,  the switch  437  has respective input and output connection points  417   a  and  417   b,  and the switch  438  has respective input and output connection points  418   a  and  418   b.    
     Each of the switches  431 - 438  is configured to receive, via respective ones of the input connection points  411   a - 418   a,  one or more voltage signals. For instance, the input connection points  411   a,    414   a,    415   a,  and  418   a  are configured to receive a first voltage signal V A . In addition, the input connection points  412   a,    413   a,    416   a,  and  417   a  are configured to receive a second voltage signal V B . In  FIG.  4   , the voltage signals V A  and V B  may be received from a voltage source, such as the voltage source  110  described in regard to  FIG.  1   . For example, the voltage signals V A  and V B  are a constant (or substantially constant) voltage level, such as +15V and −15V, 15V and 0V, or other suitable voltage levels.  FIG.  4    describes the voltage signals V A , and V B  as being constant or substantially constant, but other implementations are possible. For example, a multi-device control system in a 2:1 configuration could receive voltage signals that alternate levels during multiple time periods, such as the voltage signals V 1  and V 2  described in regard to  FIG.  2   . 
     In  FIG.  4   , the IAI devices  440  and  445  are configured to receive at least one of the voltage signals V A  and V B  at each respective voltage input point, such as via the switches  431 - 438 . For instance, the voltage input point  441  is electrically connected to the output connection points  411   b  and  412   b.  The IAI device  440  is configured to receive, at the voltage input point  441 , one or more of the voltage signals V A  and V B  via, respectively, the switches  431  and  432 . In addition, the voltage input point  442  is electrically connected to the output connection points  413   b  and  414   b.  The IAI device  440  is configured to receive, at the voltage input point  442 , one or more of the voltage signals V A  and V B  via, respectively, the switches  433  and  434 . Furthermore, the voltage input point  446  is electrically connected to the output connection points  415   b  and  416   b.  The IAI device  445  is configured to receive, at the voltage input point  446 , one or more of the voltage signals V A  and V B  via, respectively, the switches  435  and  436 . In addition, the voltage input point  447  is electrically connected to the output connection points  417   b  and  418   b.  The IAI device  445  is configured to receive, at the voltage input point  447 , one or more of the voltage signals V A  and V B  via, respectively, the switches  437  and  438 . 
     In the multi-device control system  400 , the controller  405  provides to the analog switch component  420  a digital control signal, such as a signal using an SPI communication protocol. Responsive to the digital control signal from the controller  405 , the analog switch component  420  modifies states of one or more of the switches  431 - 438 . In some cases, the analog switch component  420  is configured to provide control voltage signals to the IAI devices  440  and  445  via one or more of the switches  431 - 438 . For example, responsive to the digital control signal from the controller  405 , the analog switch component  420  modifies the switches  431  and  432 , such as opening or closing in an alternating pattern at about 50 Hz. Based on the modified states of the switches  431  and  432 , the analog switch component  420  provides the voltage signals V A  or V B , e.g., in an alternating pattern, to the voltage input point  441 . In addition, the analog switch component  420  modifies the switches  433  and  434 , such that the analog switch component  420  provides the voltage signals V A  or V B  to the voltage input point  442 . In some cases, the analog switch component  420  modifies states of the switches  431 - 434  such that the voltage input points  441  and  442  receive control voltage signals, such as described in regard to  FIG.  2   . For example, the IAI device  440  activates (e.g., powers on) responsive to receiving control voltage signals that generate a voltage differential across the points  441  and  442 , such as receiving, at a particular time period in an alternating signal pattern, the voltage signal V A  via the switch  431  and the voltage signal V B  via the switch  433 . In addition, the IAI device  440  deactivates (e.g., powers off) responsive to receiving similar control voltage signals (e.g., a voltage differential that is not sufficient for activation) via the points  441  and  442 , such as receiving, at a particular time period in an alternating signal pattern, the voltage signal V A  (or V B ) via the switches  431  and  433  (or via the switches  432  and  433 ). In some cases, the IAI device  440  deactivates responsive to one or more of the voltage input points  441  or  442  being allowed to float (e.g., electrically disconnected). 
     Responsive to the digital control signal from the controller  405 , the analog switch component  420  modifies states of one or more of the switches  435 - 438 . For example, the analog switch component  420  modifies the switches  435  and  436 , such that the voltage input point  446  receives a first control voltage signal that is based on the voltage signals V A  or V B . In addition, the analog switch component  420  modifies the switches  437  and  438 , such that the voltage input point  447  receives a second control voltage signal that is based on the voltage signals V A  or V B . In some cases, the IAI device  445  activates responsive to receiving, at a particular time period, control voltage signals that generate a voltage differential across the voltage input points  446  and  447 , or deactivates (e.g., powers off) responsive to receiving, at a particular time period, similar control voltage signals via the voltage input points  446  and  447 , or if one or more of the points  446  or  447  is allowed to float. 
     In some cases, the analog switch component  420  modifies the switches  435 - 438  independently of the switches  431 - 434 . For example, the IAI device  445  receives control voltage signals that are different from, similar to, or partly similar to control voltage signals received by the IAI device  440 . In the multi-device control system  400 , the analog switch component  420  provides individual control to the multiple IAI devices  440  and  445 .  FIG.  4    describes the analog switch component  420  as providing voltage control signals via the switches  431 - 438 , but other implementations are possible, such as a multi-device control system that provides one or more voltage control signals via a single-pull multi-throw relay, a multiplexer, or another suitable component. 
     In some implementations, one or more of the voltage signals V A  and V B  are modified via PWM. For instance, the multi-device control system  400  could include a PWM component configured to modify the voltage signals V A  and V B . In addition, the analog switch component  420  (or a PWM component in the system  400 ) could modify switch states such that one or more of the control voltage signals (e.g., provided via the input connection points  411   b - 418   b ) has a particular voltage level for relatively shorter or longer amounts of time. In some cases, one or more of the IAI devices  440  or  445  modifies an output responsive to receiving a PWM-modified control voltage signal, such as activating a motor or light-emitting component for relatively shorter or longer periods of time. 
       FIG.  5    is a flow chart depicting an example of a process  500  for providing voltage signals to multiple IAI devices, such as in a multi-device control system with a 2:1 configuration. In some embodiments, such as described in regard to  FIGS.  1 - 4   , a processing device implementing a multi-device control system implements operations described in  FIG.  5   , by executing suitable program code. For illustrative purposes, the process  500  is described with reference to the examples depicted in  FIGS.  1 - 4   . Other implementations, however, are possible. 
     At block  510 , the process  500  involves receiving a digital control signal. For example, an analog switch component in a multi-device control system, such as the analog switch component  420 , receives a digital control signal from a controller, such as the controller  405 . In some cases, the digital control signal includes data indicating one or more states associated with an IAI device that is electrically connected with the analog switch component. For example, the digital control signal received by the analog switch component  420  includes data describing one or more states associated with the IAI device  440  or the IAI device  445 . 
     At block  520 , the process  500  involves modifying multiple switches responsive to the digital control signal, such as respective states of a first switch and a second switch. The first and second switches are associated, for instance, with a particular IAI device or a particular voltage input point of the device. In some cases, responsive to the digital control signal indicating a first state of the particular IAI device, the analog switch component modifies the first switch (e.g., switch  431 ) to provide a first voltage signal to a first voltage input point of the particular IAI device. In addition, the analog switch component modifies the second switch (e.g., switch  433 ) to provide a second voltage signal to a second voltage input point of the particular IAI device. For example, responsive to the digital control signal indicating a first state (e.g., activated) for the IAI device  440 , the analog switch component  420  modifies the switches  431  and  433  to have closed states. In addition, the switches  432  and  434  may be modified to have open states. In some cases, the IAI device  440  receives the first voltage signal V A  via the switch  431  and the second voltage signal V B  via the switch  433 . 
     At block  530 , the process  500  involves modifying at least one additional switch responsive to the digital control signal. For example, responsive to the digital control signal indicating a second state of the particular IAI device, the analog switch component may modify a state of a third switch associated with the particular IAI device. For example, responsive to the digital control signal indicating a second state (e.g., deactivated) for the IAI device  440 , the analog switch component  420  modifies (at least) the switch  434  to have a closed state. In addition, the switch  433  may be modified to have an open state. In some cases, the IAI device  440  receives the first voltage signal V A  via the switch  431  and via the switch  434 . 
     In some cases, the analog switch component controls the first and second switches such that the particular IAI device does not receive the first voltage signal and second voltage signal at a particular voltage input point during a particular time period. For example, the analog switch component  420  controls the switches  431 - 438  such that  431  and  432  (or other pairs connected to a particular voltage input point) are not closed during a same time period. 
     Bus/Inverted Bus Configurations 
     In some implementations, a multi-device control system includes a signal-generating analog switch component (also referred to herein as a “bus-generating component”). A bus-generating component can be configured to generate one or more voltage signals, such as a signal bus (also referred to herein as a “bus”) or an inverted signal bus (also referred to herein as an “inverted bus”). The bus can include a voltage signal having voltage levels that alternate based on a time period, such as a square wave that alternates at a frequency of 50 Hz. In addition, the inverted bus can include a voltage signal having voltage levels that alternate based on the time period of the bus. The voltage levels of the inverted bus can be different from the voltage levels of the bus. For example, a bus and an inverted bus may alternate voltage levels at same (or similar) time periods. In this example, during a first time period, the bus has a relatively high voltage level and the inverted bus has a relatively low voltage level. Continuing in this example, during a second time period immediately subsequent to the first time period, the bus has a relatively low voltage level and the inverted bus has a relatively high voltage level. In some cases, the voltage signals V 1  and V 2  described in regard to  FIG.  2    are examples of a bus and an inverted bus. 
     In some implementations, the example multi-device control system can include one or more additional analog switch components configured to provide the bus or inverted bus to one or more IAI devices. For example, to activate a particular IAI device, an example analog switch component could provide the bus and inverted bus to respective voltage input points of the particular IAI device. In addition, to deactivate the particular IAI device, the example analog switch component could provide the bus (or the inverted bus) to multiple voltage input points of the particular IAI device. In addition, to deactivate the particular IAI device, the example analog switch component could allow a voltage input point of the particular IAI device to float, such as by opening all switches electrically connected to the voltage input point. In some cases, the example multi-device control system having the bus-generating component can provide control for an increased number of IAI devices by a particular analog switch component, potentially increasing efficiency or decreasing manufacturing costs related to the example multi-device control system. In some cases, a bus/inverted bus signal pair is generated by a bus-generating component and provided to one or more IAI devices via an additional component, such as an analog switch component as described in regard to, at least,  FIGS.  6 - 10   . 
       FIG.  6    is a diagram depicting an example of a multi-device control system  600  in which a signal-generating analog switch component (also referred to herein as a “bus-generating component”) is configured to generate one or more voltage signals. The voltage signals generated via a particular bus-generating component can be provided to one or more analog switch components in the multi-device control system  600 . For example, the multi-device control system  600  includes a signal-generating analog switch component  650  (“bus-generating component  650 ”). The bus-generating component  650  is configured to generate at least one signal bus and at least one inverted signal bus. In addition, the bus and the inverted bus are provided to at least one analog switch component, such as an analog switch component  620 . In some cases, the analog switch component  620  is configured to provide control voltage signals to multiple IAI devices, including an IAI device  640 , an IAI device  642 , an IAI device  644 , and an IAI device  646 . In addition, the bus (or the inverted bus) is provided to one or more of the IAI devices  640 ,  642 ,  644 , or  646 . In some cases, for convenience and not by way of limitation, the multi-device control system  600  is referred to as a 4:1 configuration, such as a configuration in which a particular analog switch component provides control for four or fewer IAI devices. In some cases, one or more additional analog switch components are included in the multi-device control system  600 , such as additional analog switch components connected (e.g., daisy-chained) to the analog switch component  620 . 
     The bus-generating component  650  may be a switch component including at least four switches, including switches  652 ,  654 ,  656 , and  658 . The switches  652  and  658  are configured to receive a first voltage signal, such as V+. In addition, the switches  654  and  656  are configured to receive a second voltage signal, such as V−. In  FIG.  6   , the voltage signals V+ and V− may be received from a voltage source, such as the voltage source  110  described in regard to  FIG.  1   . For example, the voltage signals V+ and V− are a constant (or substantially constant) voltage level, such as +15V and −15V, 15V and 0V, or other suitable voltage levels. 
     In some implementations, the bus-generating component  650  generates one or more voltage signals by modifying switch states of one or more of the switches  652 ,  654 ,  656 , or  658 . For instance, by opening switch  652  and closing switch  654  during a first time period and closing switch  652  and opening switch  654  during a second (e.g., subsequent) time period, the component  650  generates the signal bus. The signal bus is provided, for example, via a first signal output point of the bus-generating component  650 . In the multi-device control system  600 , the signal bus includes a voltage signal with multiple voltage levels (e.g., V+ and V−) that alternate at a particular frequency, e.g., 50 Hz. In addition, by opening switch  656  and closing switch  658  during the first time period and closing switch  656  and opening switch  658  during the second time period, the component  650  generates the inverted signal bus. The inverted signal bus is provided, for example, via a second signal output point of the bus-generating component  650 . In the multi-device control system  600 , the inverted signal bus includes an additional voltage signal with multiple voltage levels that alternate at the particular frequency, such that the bus and inverted bus include different voltage levels (e.g., V+ and V−) during a particular time period. In some cases, the voltage signals V 1  and V 2  described in regard to  FIG.  2    are examples of the bus and the inverted bus generated by the bus-generating component  650 . For convenience, and not by way of limitation,  FIG.  6    may identify the bus and inverted bus generated by the component  650  as BUS and !BUS, respectively. 
     In some cases, the bus-generating component  650  is an octal switch component that includes eight switches. In some implementations, the bus-generating component  650  is configured to generate multiple buses or inverted buses. For example, in addition to the bus and inverted bus described above in regard to  FIG.  6   , the bus-generating component  650  could be configured to generate, via additional switches of the octal switch component, an additional bus and an additional inverted bus. The example additional bus and additional inverted bus may, but need not, have characteristics that are similar to, different from, or partly similar to characteristics of the example bus and inverted bus. For instance, the additional bus and additional inverted bus may have additional voltage levels, alternate at an additional frequency, or have other characteristics that vary from characteristics of the bus and inverted bus. In some cases, the bus-generating component  650  is configured to provide multiple bus/inverted bus signal pairs to multiple types of IAI devices via multiple analog switch components. For example, the bus-generating component  650  provides the bus and inverted bus to a group of PDLC IAI devices (e.g., devices  640 ,  642 ,  644 , and  646 ). In addition, the bus-generating component  650  could provide the additional bus and additional inverted bus to a group of speaker IAI devices. 
     In  FIG.  6   , the analog switch component  620  is an octal switch component including eight switches, including switches  631 ,  632 ,  633 ,  634 ,  635 ,  636 ,  637 , and  638 . In the analog switch component  620 , the switch  631  has an input connection point  611   a  and an output connection point  611   b.  In addition, the switch  632  has respective input and output connection points  612   a  and  612   b,  the switch  633  has respective input and output connection points  613   a  and  613   b,  the switch  634  has respective input and output connection points  614   a  and  614   b,  the switch  635  has respective input and output connection points  615   a  and  615   b,  the switch  636  has respective input and output connection points  616   a  and  616   b,  the switch  637  has respective input and output connection points  617   a  and  617   b,  and the switch  638  has respective input and output connection points  618   a  and  618   b.    
     Each of the switches  631 - 638  is configured to receive, via respective ones of the input connection points  611   a - 618   a,  one or more voltage signals. For instance, the input connection points  611   a,    613   a,    615   a,  and  617   a  are configured to receive the signal bus (e.g., BUS). In addition, the input connection points  612   a,    614   a,    616   a,  and  618   a  are configured to receive the inverted bus (e.g., !BUS). 
     In  FIG.  6   , the IAI devices  640 ,  642 ,  644 , and  646  are configured to receive at least one of the bus or the inverted bus at a respective voltage input point. In addition, the IAI devices  640 ,  642 ,  644 , and  646  are configured to receive the bus at an additional respective voltage input point. In  FIG.  6   , the IAI devices  640 ,  642 ,  644 , and  646  are described as receiving the signal bus at an additional respective voltage input point, but other implementations are possible, such as a multi-device control system in which one or more IAI devices are configured to receive an inverted signal bus at respective voltage input points. 
     The IAI device  640  has, for example, a voltage input point  671  and a voltage input point  672 . The voltage input point  671  is electrically connected to the output connection points  611   b  and  612   b.  The IAI device  640  is configured to receive, at the voltage input point  671 , one or more of the bus or inverted bus via, respectively, the switches  631  and  632 . In addition, the voltage input point  672  is electrically connected to the bus-generating component  650 . The IAI device  640  is configured to receive, at the voltage input point  672 , the signal bus from the bus-generating component  650 . 
     Furthermore, the IAI device  642  has a voltage input point  673  that is electrically connected to the output connection points  613   b  and  614   b,  and a voltage input point  674  that is electrically connected to the bus-generating component  650 . The IAI device  642  is configured to receive, at the voltage input point  673 , one or more of the bus or the inverted bus via, respectively, the switches  633  and  634 . In addition, the IAI device  642  is configured to receive, at the voltage input point  674 , the signal bus from the bus-generating component  650 . 
     Furthermore, the IAI device  644  has a voltage input point  675  that is electrically connected to the output connection points  615   b  and  616   b,  and a voltage input point  676  that is electrically connected to the bus-generating component  650 . The IAI device  644  is configured to receive, at the voltage input point  675 , one or more of the bus or the inverted bus via, respectively, the switches  635  and  636 . In addition, the IAI device  644  is configured to receive, at the voltage input point  676 , the signal bus from the bus-generating component  650 . 
     Furthermore, the IAI device  646  has a voltage input point  677  that is electrically connected to the output connection points  617   b  and  618   b,  and a voltage input point  678  that is electrically connected to the bus-generating component  650 . The IAI device  646  is configured to receive, at the voltage input point  677 , one or more of the bus or the inverted bus via, respectively, the switches  637  and  638 . In addition, the IAI device  646  is configured to receive, at the voltage input point  678 , the signal bus from the bus-generating component  650 . 
     In the multi-device control system  600 , one or more of the bus-generating component  650  or the analog switch component  620  receives a digital control signal, such as a signal using an SPI communication protocol. The digital control signal (or signals) can be received from at least one controller, such as the controller  105 . For example, the bus-generating component  650  generates the bus and inverted bus responsive to a first digital control signal received from the controller, such as by modifying states of one or more of the switches  652 ,  654 ,  656 , or  658 . In addition, the analog switch component  620  modifies states of one or more of the switches  631 - 638  responsive to one or more of the first digital control signal or a second digital control signal from the controller (or an additional controller). 
     In some cases, the analog switch component  620  is configured to provide control voltage signals to the IAI devices  640 ,  642 ,  644 , and  646  via one or more of the switches  631 - 638 . For example, responsive to the digital control signal indicating a particular state of the IAI device  640 , the analog switch component  620  modifies the switches  631  and  632 . Based on the modified states of the switches  631  and  632 , the analog switch component  620  provides to the voltage input point  671  a control voltage signal that is based on the bus or the inverted bus. The voltage input point  671  receives a control voltage signal that is similar to (e.g., the bus) or different from (e.g., the inverted bus) the bus received at the voltage input point  672 . For example, the IAI device  640  enters a first state (e.g., activates) responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  671  and  672 , such as receiving the signal bus from the bus-generating component  650  and the inverted signal bus via the switch  632 . In addition, the IAI device  640  enters a second state (e.g., deactivates) responsive to receiving similar control voltage signals (e.g., a voltage differential that is not sufficient for activation) via the voltage input points  671  and  672 , such as receiving the signal bus from the bus-generating component  650  and via the switch  631 . In some cases, the IAI device  640  enters the second state responsive to one or more of the voltage input points  671  or  672  being allowed to float (e.g., electrically disconnected). 
     Responsive to the digital control signal, the analog switch component  620  modifies states of one or more of the switches  631 - 638 . For example, the analog switch component  620  modifies the switches  633  and  634 , such that the voltage input point  673  receives a first control voltage signal that is based on the bus or the inverted bus. In some cases, the IAI device  642  enters a first state responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  673  and  674 , such as receiving the signal bus from the bus-generating component  650  and the inverted signal bus via the switch  634 . In addition, the IAI device  642  enters a second state responsive to receiving similar control voltage signals (e.g., a voltage differential that is not sufficient for activation) via the voltage input points  673  and  674 , such as receiving the signal bus from the bus-generating component  650  and via the switch  633 . In some cases, the IAI device  642  enters the second state responsive to one or more of the voltage input points  673  or  674  being allowed to float. 
     In addition, the analog switch component  620  modifies the switches  635  and  636 , such that the voltage input point  675  receives a first control voltage signal that is based on the bus or the inverted bus. In some cases, the IAI device  644  enters a first state responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  675  and  676 , such as receiving the signal bus from the bus-generating component  650  and the inverted signal bus via the switch  636 . In addition, the IAI device  644  enters a second state responsive to receiving similar control voltage signals via the voltage input points  675  and  676 , such as receiving the signal bus from the bus-generating component  650  and via the switch  635 . In some cases, the IAI device  644  enters the second state responsive to one or more of the voltage input points  675  or  676  being allowed to float. 
     Furthermore, the analog switch component  620  modifies the switches  637  and  638 , such that the voltage input point  677  receives a first control voltage signal that is based on the bus or the inverted bus. In some cases, the IAI device  646  enters a first state responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  677  and  678 , such as receiving the signal bus from the bus-generating component  650  and the inverted signal bus via the switch  638 . In addition, the IAI device  646  enters a second state responsive to receiving similar control voltage signals via the voltage input points  677  and  678 , such as receiving the signal bus from the bus-generating component  650  and via the switch  637 . In some cases, the IAI device  646  enters the second state responsive to one or more of the voltage input points  677  or  678  being allowed to float. 
     In some cases, the analog switch component  620  modifies each of the switches  631 - 638  independently of additional ones of the switches  631 - 638 . For example, each of the IAI devices  640 ,  642 ,  644 , and  646  receives control voltage signals that are different from, similar to, or partly similar to control voltage signals received by additional ones of the IAI devices  640 ,  642 ,  644 , and  646 . In the multi-device control system  600 , the analog switch component  620  provides individual control to the multiple IAI devices  640 ,  642 ,  644 , and  646 .  FIG.  6    describes the analog switch component  620  as providing voltage control signals via the switches  631 - 638 , but other implementations are possible, such as a multi-device control system that provides one or more voltage control signals via a single-pull multi-throw relay, a multiplexer, or another suitable component. 
     In some implementations, the bus-generating component  650  is configured to provide the bus and inverted bus to one or more additional analog switch components, such as additional analog switch components that are connected (e.g., daisy-chained) to the component  620 . In some cases, a multi-device control system that is configured to provide a bus and inverted bus to multiple analog switch components provides control to multiple IAI devices with improved efficiency, such as by reducing a quantity of inputs or components related to generating control voltage signals. 
     In some implementations, one or more of the bus or inverted bus are modified via PWM. For instance, the multi-device control system  600  could include a PWM component configured to modify the bus or inverted bus. In addition, the analog switch component  620  (or a PWM component in the system  600 ) could modify switch states such that one or more of the control voltage signals (e.g., provided via the input connection points  611   b - 618   b ) has a particular voltage level for relatively shorter or longer amounts of time. In some cases, one or more of the IAI devices  640 ,  642 ,  644 , or  646  modifies an output responsive to receiving a PWM-modified control voltage signal, such as activating a motor or light-emitting component for relatively shorter or longer periods of time. 
       FIG.  7    is a diagram depicting an example of a multi-device control system  700  in which a signal-generating analog switch component is configured to generate one or more voltage signals. The voltage signals generated via a particular bus-generating component can be provided to one or more analog switch components in the multi-device control system  700 . For example, the multi-device control system  700  includes a signal-generating analog switch component  750  (“bus-generating component  750 ”). The bus-generating component  750  is configured to generate at least one signal bus and at least one inverted signal bus. In addition, at least one of the bus or the inverted bus is provided to at least one analog switch component, such as an analog switch component  720 . In some cases, the analog switch component  720  is configured to provide control voltage signals to multiple IAI devices, including IAI devices  741 ,  742 ,  743 ,  744 ,  745 ,  746 ,  747 , and  748 . In addition, the bus (or the inverted bus) is provided to one or more of the IAI devices  741 - 748 . In some cases, for convenience and not by way of limitation, the multi-device control system  700  is referred to as an 8:1 configuration, such as a configuration in which a particular analog switch component provides control for eight or fewer IAI devices. In some cases, one or more additional analog switch components are included in the multi-device control system  700 , such as additional analog switch components connected (e.g., daisy-chained) to the analog switch component  720 . 
     The bus-generating component  750  may be a switch component including at least four switches, including switches  752 ,  754 ,  756 , and  758 . The switches  752  and  758  are configured to receive a first voltage signal, such as V+. In addition, the switches  754  and  756  are configured to receive a second voltage signal, such as V−. In  FIG.  7   , the voltage signals V+ and V− may be received from a voltage source, such as the voltage source  110  described in regard to  FIG.  1   . For example, the voltage signals V+ and V− are a constant (or substantially constant) voltage level, such as +15V and −15V, 15V and 0V, or other suitable voltage levels. 
     In some implementations, the bus-generating component  750  generates one or more voltage signals by modifying switch states of one or more of the switches  752 ,  754 ,  756 , or  758 . For instance, by opening switch  752  and closing switch  754  during a first time period and closing switch  752  and opening switch  754  during a second (e.g., subsequent) time period, the component  750  generates the signal bus. The signal bus is provided, for example, via a first signal output point of the bus-generating component  750 . In the multi-device control system  700 , the signal bus includes a voltage signal with multiple voltage levels (e.g., V+ and V−) that alternate at a particular frequency, e.g., 50 Hz. In addition, by opening switch  756  and closing switch  758  during the first time period and closing switch  756  and opening switch  758  during the second time period, the component  750  generates the inverted signal bus. The signal bus is provided, for example, via a second signal output point of the bus-generating component  750 . In the multi-device control system  700 , the inverted signal bus includes an additional voltage signal with multiple voltage levels that alternate at the particular frequency, such that the bus and inverted bus include different voltage levels (e.g., V+ and V−) during a particular time period. In some cases, the voltage signals V 1  and V 2  described in regard to  FIG.  2    are examples of the bus and the inverted bus generated by the bus-generating component  750 . For convenience, and not by way of limitation,  FIG.  7    may identify the bus and inverted bus generated by the component  750  as BUS and !BUS, respectively. 
     In some cases, the bus-generating component  750  is an octal switch component that includes eight switches. In some implementations, the bus-generating component  750  is configured to generate multiple buses or inverted buses. For example, in addition to the bus and inverted bus described above in regard to  FIG.  7   , the bus-generating component  750  could be configured to generate, via additional switches of the octal switch component, an additional bus and an additional inverted bus. The example additional bus and additional inverted bus may, but need not, have characteristics that are similar to, different from, or partly similar to characteristics of the example bus and inverted bus, such as additional voltage level characteristics, additional frequency characteristics, or other suitable characteristics that vary from characteristics of the bus and inverted bus. In some cases, the bus-generating component  750  is configured to provide multiple bus/inverted bus signal pairs to multiple types of IAI devices via multiple analog switch components, such as generally described in regard to  FIG.  6   . 
     In  FIG.  7   , the analog switch component  720  is an octal switch component including eight switches, including switches  731 ,  732 ,  733 ,  734 ,  735 ,  736 ,  737 , and  738 . In the analog switch component  720 , the switch  731  has an input connection point  711   a  and an output connection point  711   b.  In addition, the switch  732  has respective input and output connection points  712   a  and  712   b,  the switch  733  has respective input and output connection points  713   a  and  713   b,  the switch  734  has respective input and output connection points  714   a  and  714   b,  the switch  735  has respective input and output connection points  715   a  and  715   b,  the switch  736  has respective input and output connection points  716   a  and  716   b,  the switch  737  has respective input and output connection points  717   a  and  717   b,  and the switch  738  has respective input and output connection points  718   a  and  718   b.    
     Each of the switches  731 - 738  is configured to receive, via the input connection points  711   a - 718   a,  one or more voltage signals. For instance, the input connection points  711   a - 718   a  are configured to receive the inverted bus (e.g., !BUS). In addition, the IAI devices  741 - 748  are configured to receive the bus at a respective voltage input point, and the inverted bus at an additional respective voltage input point. In  FIG.  7   , the IAI devices  741 - 748  are described as receiving, at a respective voltage input point, the signal bus from the bus-generating component  750  and the inverted bus at an additional respective voltage input point via the switches  731 - 738 . However, other implementations are possible, such as a multi-device control system in which one or more IAI devices are configured to receive an inverted signal bus from a bus-generating component and a signal bus via one or more switches in an analog switch component. 
     The IAI device  741  has, for example, a voltage input point  771  and a voltage input point  772 . The voltage input point  771  is electrically connected to the output connection point  711   b.  The IAI device  741  is configured to receive, at the voltage input point  771 , the inverted bus via the switch  731 . In addition, the voltage input point  772  is electrically connected to the bus-generating component  750 . The IAI device  741  is configured to receive, at the voltage input point  772 , the bus from the bus-generating component  750 . In addition, each of the IAI devices  742 ,  743 ,  744 ,  745 ,  746 ,  747 , and  748  has a respective voltage input point  773 ,  775 ,  777 ,  781 ,  783 ,  785 , and  787  that is electrically connected to the respective output connection point  712   b,    713   b,    714   b,    715   b,    716   b,    717   b,  and  718   b.  Each of the IAI devices  742 ,  743 ,  744 ,  745 ,  746 ,  747 , and  748  is configured to receive the inverted bus via, respectively, the switch  732 ,  733 ,  734 ,  735 ,  736 ,  737 , and  738 . Furthermore, each of the IAI devices  742 ,  743 ,  744 ,  745 ,  746 ,  747 , and  748  has a respective voltage input point  774 ,  776 ,  778 ,  782 ,  784 ,  786 , and  788  that is electrically connected to the bus-generating component  750 . Each of the IAI devices  742 ,  743 ,  744 ,  745 ,  746 ,  747 , and  748  is configured to receive the signal bus from the bus-generating component  750 , at the respective voltage input point  774 ,  776 ,  778 ,  782 ,  784 ,  786 , and  788 . 
     In the multi-device control system  700 , one or more of the bus-generating component  750  or the analog switch component  720  receives a digital control signal, such as a signal using an SPI communication protocol. The digital control signal (or signals) can be received from at least one controller, such as the controller  105 . For example, the bus-generating component  750  generates the bus and inverted bus responsive to a first digital control signal received from the controller, such as by modifying states of one or more of the switches  752 ,  754 ,  756 , or  758 . In addition, the analog switch component  720  modifies states of one or more of the switches  731 - 738  responsive to a second digital control signal from the controller (or an additional controller). 
     In some cases, the analog switch component  720  is configured to provide control voltage signals to the IAI devices  741 - 748  via one or more of the switches  731 - 738 . For example, responsive to the digital control signal indicating a particular state of the IAI device  741 , the analog switch component  720  modifies the switch  731 . Based on the modified state of the switch  731 , the analog switch component  720  provides to the voltage input point  771  a control voltage signal that is based on the inverted bus. If, for instance, the switch  731  is closed, the voltage input point  771  receives a control voltage signal that includes the inverted bus, e.g., alternating voltage levels that are different from the bus received at the voltage input point  772 . If the switch  731  is open, the voltage input point  771  is electrically disconnected (e.g., floating). For example, the IAI device  741  enters a first state (e.g., activates) responsive to receiving control voltage signals that generate a voltage differential across the points  771  and  772 , such as receiving the signal bus from the bus-generating component  650  and the inverted signal bus via the switch  731 . In addition, the IAI device  741  enters a second state (e.g., deactivates) responsive to having an electrically disconnected voltage input point, such as a floating voltage at the point  771  based on the switch  731  being open. 
     Responsive to the digital control signal, the analog switch component  720  modifies states of one or more of the switches  731 - 738 . For example, the analog switch component  720  modifies one or more of the switches  732 - 738 , such that the respective voltage input points  773 ,  775 ,  777 ,  781 ,  783 ,  785 , and  787  receive a first control voltage signal that is based on the inverted bus or an electrically disconnected state. In some cases, one or more of the IAI devices  742 - 748  enters a respective first state responsive to receiving the signal bus from the bus-generating component  750  and the inverted signal bus via a respective voltage input point. In addition, one or more of the IAI devices  742 - 748  enters a respective second state responsive to receiving the signal bus from the bus-generating component  750  and being electrically disconnected (e.g., floating) at the respective voltage input point. 
     In some cases, the analog switch component  720  modifies each of the switches  731 - 738  independently of additional ones of the switches  731 - 738 . For example, each of the IAI devices  741 - 748  receives control voltage signals that are different from, similar to, or partly similar to control voltage signals received by additional ones of the IAI devices  741 - 748 . In the multi-device control system  700 , the analog switch component  720  provides individual control to the multiple IAI devices  741 - 748 .  FIG.  7    describes the analog switch component  720  as providing voltage control signals via the switches  731 - 738 , but other implementations are possible, such as a multi-device control system that provides one or more voltage control signals via a single-pull multi-throw relay, a multiplexer, or another suitable component. 
     In some implementations, one or more of the bus or the inverted bus are modified via PWM. For instance, the multi-device control system  700  could include a PWM component configured to modify the bus or inverted bus. In addition, the analog switch component  720  (or a PWM component in the system  700 ) could modify switch states such that one or more of the control voltage signals (e.g., provided via the input connection points  711   b - 718   b ) has a particular voltage level for relatively shorter or longer amounts of time. In some cases, one or more of the IAI devices  741 - 748  modifies an output responsive to receiving a PWM-modified control voltage signal, such as activating a motor or light-emitting component for relatively shorter or longer periods of time. 
     In some implementations, the bus-generating component  750  is configured to provide the bus and inverted bus to one or more additional analog switch components, such as additional analog switch components that are connected (e.g., daisy-chained) to the component  720 . In some cases, a multi-device control system that is configured to provide a bus and inverted bus to multiple analog switch components provides control to multiple IAI devices with improved efficiency, such as by reducing a quantity of inputs or components related to generating control voltage signals. 
     In some implementations, a multi-device control system that is configured to provide a control voltage signal based on a combination of a bus, an inverted bus, and an electrically disconnected state provides control to multiple IAI devices with improved efficiency, such as by controlling one IAI device per switch of an analog switch component. In addition, the example control voltage signal based on the bus, inverted bus, and electrically disconnected state can provide control to types of IAI devices that change state (e.g., activating, deactivating) relatively slowly compared to a frequency of the example control voltage signal. For instance, if the example control voltage signal includes a bus and inverted bus that alternate at a frequency of 50 Hz, the example control voltage signal could control an IAI device that changes state relatively slowly compared to the example 50 Hz frequency, such as more slowly than 20 msec. 
       FIG.  8    is a flow chart depicting an example of a process  800  for providing voltage signals to multiple IAI devices, such as voltage signals that are based on one or more of a signal bus or an inverted signal bus. In some cases, the process  800  is implemented in a multi-device control system with a 4:1 configuration or a multi-device control system with an 8:1 configuration. In some embodiments, such as described in regard to  FIGS.  1 - 7   , a processing device implementing a multi-device control system implements operations described in  FIG.  8   , by executing suitable program code. For illustrative purposes, the process  800  is described with reference to the examples depicted in  FIGS.  1 - 7   . Other implementations, however, are possible. 
     At block  810 , the process  800  involves receiving a digital control signal. For example, an analog switch component in a multi-device control system, such as the analog switch components  620  or  720 , receives a digital control signal from a controller. In some cases, the digital control signal includes data indicating one or more states associated with an IAI device that is electrically connected with the analog switch component. For example, the digital control signal received by the analog switch component  620  includes data describing one or more states associated with the IAI devices  640 ,  642 ,  644 , or  646 . In addition, the digital control signal received by the analog switch component  720  includes data describing one or more states associated with the IAI devices  741 - 748 . 
     At block  820 , the process  800  involves providing a first control voltage signal to a first voltage input point, such as a first voltage input point of a particular IAI device. The first control voltage signal is based on, for example, a signal bus or an inverted signal bus, such as a bus or inverted bus generated via a bus-generating component. In addition, the first control voltage signal is provided to the particular IAI device via an electrical connection to a first input connection point of the analog switch component. For example, the voltage input point  672  is electrically connected to the input connection point  611   a  and a first signal output point of the bus-generating component  650 . In addition, the bus generated by the bus-generating component  650  is provided to the voltage input point  672  via the electrical connection with the first signal output point and the point  611   a.    
     In some cases, such as in a multi-device control system with an 8:1 configuration, the first voltage input point receives the first control voltage signal via an electrical connection with the bus-generating component. For example, the voltage control point  772  receives the bus via an electrical connection with a first signal output point of the bus-generating component  750 . In addition, the voltage control point  772  is electrically disconnected from the input connections points  711   a - 718   a  of the analog switch component  720 . 
     At block  830 , the process  800  involves modifying one or more switches responsive to the digital control signal, such as a state of (at least) a first switch. The first switch is associated, for instance, with the particular IAI device. In some cases, responsive to the digital control signal indicating a first state of the particular IAI device, the analog switch component modifies the first switch to provide a second voltage signal to a second voltage input point of the particular IAI device. For example, responsive to the digital control signal indicating a first state (e.g., activated) for the IAI device  640 , the analog switch component  620  modifies the switch  632  to have a closed state. In the first state, for example, the IAI device  640  receives the first voltage signal BUS via the voltage input point  672  and the second voltage signal !BUS via the switch  632 . In addition, responsive to the digital control signal indicating a first state for the IAI device  741 , the analog switch component  720  modifies the switch  731  to have a closed state. In the first state, for example, the IAI device  741  receives the first voltage signal BUS via the voltage input point  772  and the second voltage signal !BUS via the switch  731 . 
     In some cases, one or more additional switches are modified responsive to the digital control signal indicating the first state of the particular IAI device, such as modifying a second switch to have an open state. For example, responsive to the digital control signal indicating the first state for the IAI device  640 , the analog switch component  620  modifies the switch  631  to have an open state. 
     At block  840 , the process  800  involves modifying the state of (at least) the first switch, responsive to the digital control signal. For example, responsive to the digital control signal indicating a second state of the particular IAI device, the analog switch component modifies the first switch such that the second voltage input point is electrically disconnected, e.g., from the bus-generating component. For example, responsive to the digital control signal indicating a second state (e.g., deactivated) for the IAI device  640 , the analog switch component  620  modifies the switch  632  to have an open state. In the second state, for example, the IAI device  640  receives the first voltage signal BUS via the voltage input point  672  and is disconnected from the second voltage signal !BUS via the switch  632 . In addition, responsive to the digital control signal indicating a second state for the IAI device  741 , the analog switch component  720  modifies the switch  731  to have an open state. In the second state, for example, the IAI device  741  receives the first voltage signal BUS via the voltage input point  772  and is disconnected from the second voltage signal !BUS via the switch  731 . 
     In some cases, one or more additional switches are modified responsive to the digital control signal indicating the second state of the particular IAI device, such as modifying the second switch to have a closed state. At block  850 , the process  800  involves modifying the state of an additional switch, such as the second switch, responsive to the digital control signal. For example, responsive to the digital control signal indicating the second state of the particular IAI device, the analog switch component modifies the second switch such that the first voltage signal is received by the second voltage input point. For example, responsive to the digital control signal indicating the second state for the IAI device  640 , the analog switch component  620  modifies the switch  631  to have a closed state. In the second state, for example, the IAI device  640  receives the first voltage signal BUS via the voltage input point  672  and via the switch  631 . In some cases, one or more operations related to block  850  are optional, such as in a multi-device control system with an 8:1 configuration. 
     In some cases, the analog switch component controls the one or more switches such that the particular IAI device does not receive the first voltage signal and second voltage signal at a particular voltage input point during a particular time period. For example, the analog switch component  620  controls the switches  631 - 638  such that switches  631  and  632  (or other pairs connected to a particular voltage input point) are not closed during a same time period. 
     Neighbor Control Configuration 
     In some implementations, multiple IAI devices are arranged in a particular physical configuration. For example, the IAI devices could be arranged in a relatively dense array (or other arrangement), such that relatively little space is present between the IAI devices. In the particular physical configuration, such as the example dense array, there may be manufacturing difficulties, performance difficulties, or other adverse conditions related to physical constraints of each of the multiple IAI devices. For example, electrical connections with a clip form (or other form factor) may require more space between each IAI device than is available in the example dense array. Other physical constraints could include, without limitation, structural components (e.g., a firm backing for a relatively flexible device), attachment components to affix an IAI device to fabric, bending radii of flexible devices or flexible electrical connections, or other suitable constraints. In some cases, a particular type of IAI device is associated with one or more particular constraints. For example, a particular type of PDLC device could require clip-type electrical connections, while a particular type of piezoelectric device could require a minimum bending radius. Additional physical constraints may be associated with these or additional types of IAI devices. 
     In some cases, a multi-device control system provides control to multiple IAI devices having a particular physical configuration in which relatively little space is present between the IAI devices. The multi-device control system can be configured to provide one or more voltage signals (e.g., V A  and V B , bus and inverted bus) to electrical connection points that are shared between or among multiple IAI devices. In some examples described herein, two or more IAI devices that share an electrical connection via respective voltage input points are referred to as “neighbor IAI devices.” For example, a first IAI device can be electrically connected to a second IAI device, such as an electrical connection between a first voltage input point of the first device and a second voltage input point of the second device. An analog switch component can be configured to provide a control voltage signal to the first IAI device and the second IAI device via the shared electrical connection, such that the example signal is received by the first voltage input point and the second voltage input point. In addition, additional control voltage signals are provided to additional voltage input points of the first and second IAI devices. In some cases, states of the first and second IAI devices can be controlled based on similarities, differences, or partial similarities of control voltage signals received by the voltage input points. For example, if the second IAI device receives a signal bus via the second voltage input point, e.g., at the shared electrical connection with the first voltage input point, the second IAI device could enter an activated state responsive to receiving an inverted signal bus at an additional voltage input point. Additional IAI devices could be connected (e.g., daisy-chained) to the second IAI device, such as a third IAI device that shares an electrical connection with the second IAI device at the additional voltage input point. 
     In some implementations, the example multi-device control system that is configured to provide a voltage signal to neighbor IAI devices via a shared electrical connection can improve performance of the multiple IAI devices in the particular physical configuration. For example, the shared electrical connection could reduce a quantity of electrical connection components utilized in the particular physical configuration. In addition, reducing the quantity of electrical connection components could increase the quantity of IAI devices that can be physically arranged within a particular physical space. In addition, reducing the quantity of electrical connection components could reduce manufacturing costs related to the example multi-device control system, such as costs for purchasing the electrical connection components. 
       FIG.  9    is a diagram depicting an example of a multi-device control system  900  that is configured to control neighbor IAI devices. The multi-device control system  900  includes a signal-generating analog switch component  950  (“bus-generating component  950 ”). The bus-generating component  950  is configured to generate at least one signal bus and at least one inverted signal bus. In addition, the bus and the inverted bus are provided to at least one analog switch component, such as an analog switch component  920 . In some cases, the analog switch component  920  is configured to provide control voltage signals to multiple IAI devices, including an IAI device  940 , an IAI device  942 , an IAI device  944 , and an IAI device  946 . In addition, the bus (or the inverted bus) is provided to one or more of the IAI devices  940 ,  942 ,  944 , or  946 . In some cases, for convenience and not by way of limitation, the multi-device control system  900  is referred to as a configuration having neighbor control, such as a configuration in which an analog switch component provides a particular control voltage signal to a pair (or more) of neighbor IAI devices via a shared electrical connection. In some cases, one or more additional analog switch components are included in the multi-device control system  900 , such as additional analog switch components connected (e.g., daisy-chained) to the analog switch component  920 . The multi-device control system  900  is depicted as a 4:1 configuration, but other implementations are possible, such as a 2:1 configuration with neighbor control. 
     The bus-generating component  950  may be a switch component including at least four switches, including switches  952 ,  954 ,  956 , and  958 . The switches  952  and  958  are configured to receive a first voltage signal, such as V+. In addition, the switches  954  and  956  are configured to receive a second voltage signal, such as V−. In  FIG.  9   , the voltage signals V+ and V− may be received from a voltage source, such as the voltage source  110  described in regard to  FIG.  1   . For example, the voltage signals V+ and V− are a constant (or substantially constant) voltage level, such as +15V and −15V, 15V and 0V, or other suitable voltage levels. In some implementations, the bus-generating component  950  generates one or more voltage signals by modifying switch states of one or more of the switches  952 ,  954 ,  956 , or  958 , such as described above in regard to (at least)  FIG.  6   . In  FIG.  9   , the generated voltage signals include a signal bus and an inverted signal bus. The signal bus and inverted signal bus are respectively provided, for example, via a first signal output point and a second signal output point of the bus-generating component  950 . In the multi-device control system  900 , the signal bus includes a voltage signal with multiple voltage levels (e.g., V+ and V−) that alternate at a particular frequency, e.g., 50 Hz. In the multi-device control system  900 , the inverted signal bus includes an additional voltage signal with multiple voltage levels that alternate at the particular frequency, such that the bus and inverted bus include different voltage levels (e.g., V+ and V−) during a particular time period. In some cases, the voltage signals V 1  and V 2  described in regard to  FIG.  2    are examples of the bus and the inverted bus generated by the bus-generating component  950 . For convenience, and not by way of limitation,  FIG.  9    may identify the bus and inverted bus generated by the component  950  as BUS and !BUS, respectively. 
     In some cases, the bus-generating component  950  is an octal switch component that includes eight switches. In some implementations, the bus-generating component  950  is configured to generate multiple buses or inverted buses. For example, in addition to the bus and inverted bus described above in regard to  FIG.  9   , the bus-generating component  950  could be configured to generate, via additional switches of the octal switch component, an additional bus and an additional inverted bus. The example additional bus and additional inverted bus may, but need not, have characteristics that are similar to, different from, or partly similar to characteristics of the example bus and inverted bus, such as additional voltage level characteristics, additional frequency characteristics, or have other suitable characteristics that vary from characteristics of the bus and inverted bus. In some cases, the bus-generating component  950  is configured to provide multiple bus/inverted bus signal pairs to multiple types of IAI devices via multiple analog switch components, such as generally described in regard to  FIG.  6   . 
     In  FIG.  9   , the analog switch component  920  is an octal switch component including eight switches, including switches  931 ,  932 ,  933 ,  934 ,  935 ,  936 ,  937 , and  938 . In the analog switch component  920 , the switch  931  has an input connection point  911   a  and an output connection point  911   b.  In addition, the switch  932  has respective input and output connection points  912   a  and  912   b,  the switch  933  has respective input and output connection points  913   a  and  913   b,  the switch  934  has respective input and output connection points  914   a  and  914   b,  the switch  935  has respective input and output connection points  915   a  and  915   b,  the switch  936  has respective input and output connection points  916   a  and  916   b,  the switch  937  has respective input and output connection points  917   a  and  917   b,  and the switch  938  has respective input and output connection points  918   a  and  918   b.    
     Each of the switches  931 - 938  is configured to receive, via respective ones of the input connection points  911   a - 918   a,  one or more voltage signals. For instance, the input connection points  911   a,    913   a,    915   a,  and  917   a  are configured to receive the signal bus (e.g., BUS). In addition, the input connection points  912   a,    914   a,    916   a,  and  918   a  are configured to receive the inverted bus (e.g., !BUS). 
     In  FIG.  9   , the IAI devices  940 ,  942 ,  944 , and  946  are configured to receive, at respective voltage input points, respective control voltage signals that are based on at least one of the bus or the inverted bus. In addition, the IAI devices  940 ,  942 ,  944 , and  946  are configured as one or more pairs of neighbor IAI devices, such that the respective control voltage signals are received via respective shared electrical connections. For example, each of the IAI devices  940 ,  942 ,  944 , and  946  includes at least one voltage input point that is electrically connected with an additional voltage input point of an additional one of the IAI devices  940 ,  942 ,  944 , and  946 . 
     The IAI device  940  has, for example, a voltage input point  971  and a voltage input point  972 . The voltage input point  971  is electrically connected to the bus-generating component  950 . The IAI device  940  is configured to receive, at the voltage input point  971 , the signal bus from the bus-generating component  950 . In addition, the voltage input point  972  is electrically connected to the output connection points  911   b  and  912   b.  The IAI device  940  is configured to receive, at the voltage input point  972 , one or more of the bus or inverted bus via, respectively, the switches  931  and  932 . For convenience, and not by way of limitation, the IAI device  940  can be referred to as an initial IAI device, such as an IAI device that receives a particular voltage signal at a particular voltage input point. In  FIG.  9   , the particular voltage input point  971  can be referred to as an initial voltage input point, such as a voltage input point that does not share an electrical connection with additional voltage input points of additional IAI devices. In  FIG.  9   , the IAI device  940  is described as receiving the signal bus at the voltage input point  971 , but other implementations are possible, such as a multi-device control system in which an initial IAI device is configured to receive an inverted signal bus at an initial voltage input point. 
     In  FIG.  9   , the IAI device  940  and the IAI device  942  are arranged as neighbor IAI devices. For example, the IAI device  942  has a voltage input point  973  and a voltage input point  974 . The voltage input point  973  is electrically connected to the output connection points  911   b  and  912   b  and also to the voltage input point  972  of the IAI device  940 . In addition, the voltage input point  974  is electrically connected to the output connection points  913   b  and  914   b.  In  FIG.  9   , the neighbor IAI devices  940  and  942  share an electrical connection to the switches  931  and  932 . 
     In addition, the IAI device  942  and the IAI device  944  are arranged as neighbor IAI devices. For example, the IAI device  944  has a voltage input point  975  and a voltage input point  976 . The voltage input point  975  is electrically connected to the output connection points  913   b  and  914   b  and also to the voltage input point  974  of the IAI device  942 . In addition, the voltage input point  976  is electrically connected to the output connection points  915   b  and  916   b.  In  FIG.  9   , the neighbor IAI devices  942  and  944  share an electrical connection to the switches  933  and  934 . 
     Furthermore, the IAI device  944  and the IAI device  946  are arranged as neighbor IAI devices. For example, the IAI device  946  has a voltage input point  977  and a voltage input point  978 . The voltage input point  977  is electrically connected to the output connection points  915   b  and  916   b  and also to the voltage input point  976  of the IAI device  944 . In addition, the voltage input point  978  is electrically connected to the output connection points  917   b  and  918   b.  In  FIG.  9   , the neighbor IAI devices  944  and  946  share an electrical connection to the switches  935  and  936 . In some cases, the IAI device  946  is arranged as a neighbor to an additional IAI device, such as an additional IAI device that is electrically connected to the output connection points  917   b  and  918   b  and also to the voltage input point  978  of the IAI device  946 . 
     In the multi-device control system  900 , one or more of the bus-generating component  950  or the analog switch component  920  receives a digital control signal, such as a signal using an SPI communication protocol. The digital control signal (or signals) can be received from at least one controller, such as the controller  105 . For example, the bus-generating component  950  generates the bus and inverted bus responsive to a first digital control signal received from the controller, such as by modifying states of one or more of the switches  952 ,  954 ,  956 , or  958 . In addition, the analog switch component  920  modifies states of one or more of the switches  931 - 938  responsive to one or more of the first digital control signal or a second digital control signal from the controller (or an additional controller). 
     In some cases, the analog switch component  920  is configured to provide control voltage signals to the IAI devices  940 ,  942 ,  944 , and  946  via one or more of the switches  931 - 938 . For example, responsive to the digital control signal indicating a particular state of the IAI device  940 , the analog switch component  920  modifies the switches  931  and  932 . Based on the modified states of the switches  931  and  932 , the analog switch component  920  provides to the voltage input point  972  a first control voltage signal that is based on the bus or the inverted bus. The voltage input point  972  receives the first control voltage signal that is similar to (e.g., the bus) or different from (e.g., the inverted bus) the bus received at the voltage input point  971 . For example, the IAI device  940  enters a first state (e.g., activates) responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  971  and  972 , or a second state (e.g., deactivates) responsive to receiving similar control voltage signals (e.g., a voltage differential that is not sufficient for activation) via the voltage input points  971  and  972 . 
     In  FIG.  9   , the IAI device  942  receives, via the voltage input point  973 , the first control voltage signal that is received by the IAI device  940  via the voltage input point  972 . In addition, responsive to the digital control signal, the analog switch component  920  provides a second control voltage signal to the voltage input point  974  of the IAI device  942 , such as by modifying states of the switches  933  and  934 . In some cases, the second control voltage signal at the voltage input point  974  is similar to or different from the first control voltage signal at the voltage input point  973 . For example, the IAI device  942  enters a first state responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  973  and  974 , or a second state responsive to receiving similar control voltage signals via the voltage input points  973  and  974 . 
     In addition, the IAI device  944  receives, via the voltage input point  975 , the second control voltage signal that is received by the IAI device  942  via the voltage input point  974 . Responsive to the digital control signal, the analog switch component  920  provides a third control voltage signal to the voltage input point  976  of the IAI device  944 , such as by modifying states of the switches  935  and  936 . In some cases, the third control voltage signal at the voltage input point  976  is similar to or different from the second control voltage signal at the voltage input point  975 . For example, the IAI device  944  enters a first state responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  975  and  976 , or a second state responsive to receiving similar control voltage signals via the voltage input points  975  and  976 . 
     In addition, the IAI device  946  receives, via the voltage input point  977 , the third control voltage signal that is received by the IAI device  944  via the voltage input point  976 . Responsive to the digital control signal, the analog switch component  920  provides a fourth control voltage signal to the voltage input point  978  of the IAI device  946 , such as by modifying states of the switches  937  and  938 . In some cases, the fourth control voltage signal at the voltage input point  978  is similar to or different from the third control voltage signal at the voltage input point  977 . For example, the IAI device  946  enters a first state responsive to receiving control voltage signals that generate a voltage differential across the voltage input points  977  and  978 , or a second state responsive to receiving similar control voltage signals via the voltage input points  977  and  978 . In some cases, an additional IAI device arranged as a neighbor to the IAI device  946  could receive the fourth control voltage signal at an additional voltage input point that is electrically connected to the voltage input point  978 . 
     In some cases, the analog switch component  920  modifies each of the switches  931 - 938  independently of additional ones of the switches  931 - 938 . In addition, one or more control voltage signals for each of the IAI devices  940 ,  942 ,  944 , and  946  is determined, in part, based on one or more control voltage signals received by neighboring IAI devices. For example, if the IAI device  940  is indicated, based on data in the digital control signal, as being in an activated state, the analog switch component  920  may provide to the voltage input point  972  the inverted bus, which generates a voltage differential with respect to the bus received at voltage input point  971 . In addition, if the IAI device  942  is indicated as being in an activated state, the analog switch component  920  may provide to the voltage input point  974  the bus, which generates a voltage differential with respect to the inverted bus received at voltage input point  973  (e.g., at the shared connection with voltage input point  972 ). Additional control signals to the IAI devices  944 ,  946 , or additional IAI devices can be provided based on respective states indicated by the digital control signal. 
     Continuing with this example, if the analog switch component  920  receives a modified digital control signal indicating modified states of the IAI devices  940 ,  942 ,  944 , or  946 , the analog switch component  920  modifies at least one control voltage signal. For instance, if the modified digital control signal indicates a deactivated state for the IAI device  940  and the activated state for the IAI device  942 , the analog switch component  920  may provide to the voltage input point  972  the bus, which is similar to (e.g., a voltage differential that is not sufficient for activation) the bus received at voltage input point  971 . The analog switch component  920  may also provide to the voltage input point  974  the inverted bus, which is different from the bus received at voltage input point  973  (e.g., responsive to the modified digital control signal). Additional control signals to the IAI devices  944 ,  946 , or additional IAI devices can be modified based on respective states indicated by the modified digital control signal. 
     In the multi-device control system  900 , the analog switch component  920  provides individual control to the multiple IAI devices  940 ,  942 ,  944 , and  946 , based on control voltage signals that are received via shared electrical connections. In some cases, control voltage signals that incur a particular state in a particular one of the IAI devices  940 ,  942 ,  944 , and  946  can be determined based on additional control voltage signals received by a neighboring one of the IAI devices  940 ,  942 ,  944 , and  946 .  FIG.  9    describes the analog switch component  920  as providing voltage control signals via the switches  931 - 938 , but other implementations are possible, such as a multi-device control system that provides one or more voltage control signals via a single-pull multi-throw relay, a multiplexer, or another suitable component. 
       FIG.  10    is a flow chart depicting an example of a process  1000  for providing voltage signals to multiple IAI devices in a configuration having neighbor control, such as a relatively dense array of IAI devices. In some cases, the process  1000  is implemented in a multi-device control system with a 2:1 configuration, a 4:1 configuration, or other suitable configurations. In some embodiments, such as described in regard to  FIGS.  1 - 9   , a processing device implementing a multi-device control system implements operations described in  FIG.  10   , by executing suitable program code. For illustrative purposes, the process  1000  is described with reference to the examples depicted in  FIGS.  1 - 9   . Other implementations, however, are possible. 
     At block  1010 , the process  1000  involves receiving a digital control signal. For example, an analog switch component in a multi-device control system, such as the analog switch component  920 , receives a digital control signal from a controller. In some cases, the digital control signal includes data indicating one or more states associated with at least one IAI device that is electrically connected with the analog switch component. For example, the digital control signal received by the analog switch component  920  includes data describing one or more states associated with the IAI devices  940 ,  942 ,  944 , or  946 . 
     At block  1020 , the process  1000  involves providing a first control voltage signal to a first voltage input point, such as a first voltage input point of a first IAI device. The first control voltage signal is based on, for example, a signal bus, an inverted signal bus, or a voltage signal (e.g., V A , V B ). In some cases, the first control voltage signal is provided to the first IAI device via an electrical connection to a first signal output point of a bus-generating component. For example, the voltage input point  971  is electrically connected to a first signal output point of the bus-generating component  950 . In some cases, the first voltage input point of the first IAI device is electrically connected to an input connection point of an analog switch component, such as an electrical connection of the voltage input point  971  with the input connection point  911   a.    FIG.  9    depicts the voltage input point  971  as having an electrical connection to the input connection point  911   a,  but other implementations are possible. For example, a multi-device control system with a 4:1 configuration with neighbor control could include an initial IAI device having an electrical connection to a particular signal output point of a bus-generating component without an electrical connection to an input connection point of an analog switch component. 
     At block  1030 , the process  1000  involves modifying one or more switches responsive to the digital control signal, such as a state of (at least) a first switch and a second switch. The first and second switches are associated, for instance, with a shared electrical connection of the first IAI device and a second IAI device, such as the switches  931  and  932  being associated with a shared electrical connection of the voltage input points  972  and  973 . In some cases, responsive to the digital control signal indicating a first state of the particular IAI device, the analog switch component opens the first switch and closes the second switch to provide a second voltage signal to a second voltage input point of the first IAI device. In addition, the second voltage signal is provided to a third voltage input point of the second IAI device, such as via the shared electrical connection. For example, responsive to the digital control signal indicating a first state (e.g., activated) for the IAI device  940 , the analog switch component  920  opens the switch  931  and closes the switch  932 . In the first state, for example, the IAI device  940  receives the first voltage signal BUS via the voltage input point  971  and the second voltage signal !BUS via the switch  932 . In addition, the IAI device  942  receives the second voltage signal !BUS via the shared electrical connection of voltage input points  972  and  973 . 
     At block  1040 , the process  1000  involves modifying the state of one or more additional switches, responsive to the digital control signal. For example, responsive to the digital control signal indicating that the second IAI device has a same state as the first state (e.g., the first and second IAI devices are both activated), the analog switch component modifies (at least) a third switch to provide the first voltage signal to a fourth voltage input point of the second IAI device. For example, responsive to the digital control signal indicating that the IAI device  940  is activated, e.g., similar to the first state described above, the analog switch component  920  closes the switch  933 , such that the first voltage signal BUS is provided to the voltage input point  974 . In some cases, one or more additional switches are modified responsive to the digital control signal indicating the state of the second IAI device, such as opening the switch  934  or modifying additional switches associated with additional IAI devices in the multi-device control system  900 . 
     In some cases, the analog switch component controls the one or more switches such that the particular IAI device does not receive the first voltage signal and second voltage signal at a particular voltage input point during a particular time period. For example, the analog switch component  920  controls the switches  931 - 938  such that switches  931  and  932  (or other pairs connected to a particular voltage input point) are not closed during a same time period. 
     General Considerations 
     Numerous specific details are set forth herein to provide a thorough understanding of the claimed subject matter. However, those skilled in the art will understand that the claimed subject matter may be practiced without these specific details. In other instances, methods, apparatuses, or systems that would be known by one of ordinary skill have not been described in detail so as not to obscure claimed subject matter. 
     Unless specifically stated otherwise, it is appreciated that throughout this specification discussions utilizing terms such as “processing,” “computing,” “calculating,” “determining,” and “identifying” or the like refer to actions or processes of a computing device, such as one or more computers or a similar electronic computing device or devices, that manipulate or transform data represented as physical electronic or magnetic quantities within memories, registers, or other information storage devices, transmission devices, or display devices of the computing platform. 
     The system or systems discussed herein are not limited to any particular hardware architecture or configuration. A computing device can include any suitable arrangement of components that provides a result conditioned on one or more inputs. Suitable computing devices include multipurpose microprocessor-based computer systems accessing stored software that programs or configures the computing system from a general purpose computing apparatus to a specialized computing apparatus implementing one or more embodiments of the present subject matter. Any suitable programming, scripting, or other type of language or combinations of languages may be used to implement the teachings contained herein in software to be used in programming or configuring a computing device. 
     Embodiments of the methods disclosed herein may be performed in the operation of such computing devices. The order of the blocks presented in the examples above can be varied—for example, blocks can be re-ordered, combined, and/or broken into sub-blocks. Certain blocks or processes can be performed in parallel. 
     The use of “adapted to” or “configured to” herein is meant as open and inclusive language that does not foreclose devices adapted to or configured to perform additional tasks or steps. Additionally, the use of “based on” is meant to be open and inclusive, in that a process, step, calculation, or other action “based on” one or more recited conditions or values may, in practice, be based on additional conditions or values beyond those recited. Headings, lists, and numbering included herein are for ease of explanation only and are not meant to be limiting. 
     While the present subject matter has been described in detail with respect to specific embodiments thereof, it will be appreciated that those skilled in the art, upon attaining an understanding of the foregoing, may readily produce alterations to, variations of, and equivalents to such embodiments. Accordingly, it should be understood that the present disclosure has been presented for purposes of example rather than limitation, and does not preclude inclusion of such modifications, variations, and/or additions to the present subject matter as would be readily apparent to one of ordinary skill in the art.