Patent Publication Number: US-2021172636-A1

Title: Digital hvac controller for navigating information based on two or more inputs

Description:
This application claims the benefit of: 
     U.S. Provisional Patent Application No. 62/943,731, filed Dec. 4, 2019; 
     U.S. Provisional Patent Application No. 62/943,729, filed Dec. 4, 2019; 
     U.S. Provisional Patent Application No. 62/943,734, filed Dec. 4, 2019; 
     U.S. Provisional Patent Application No. 62/943,733, filed Dec. 4, 2019; and 
     U.S. Provisional Patent Application No. 62/943,735, filed Dec. 4, 2019, the entire content of each being incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to heating, ventilation, and air condition (HVAC) systems and thermostats for buildings. 
     BACKGROUND 
     A heating, ventilation, and air conditioning (HVAC) controller can control a variety of devices such as a furnace, a heat pump including a geothermal heat pump, a boiler, air conditioning unit, forced air circulation, and other similar equipment to control the internal climate conditions of a building. In some examples, a thermostat can control different devices depending on the outside temperature, temperature inside the building, the time of day, and other factors. To simplify the explanation, an environmental control system will be referred to as an HVAC system, unless otherwise noted. 
     SUMMARY 
     In general, this disclosure describes a heating, ventilation, and air conditioning (HVAC) controller including a display which can show any one or combination of a set point temperature for an area, a current temperature of the area, and one or more other parameters. The HVAC controller may include a user interface including a digital display configured to show one or more screens of a first set of screens. The first set of screens may represent a sequence of “carousel” screens, such that when the HVAC controller transitions from displaying a first screen to a second screen on the digital display, the HVAC controller transitions from the first screen to a screen which is adjacent to the first screen in the first set of screens. 
     In some examples, the HVAC controller may change the screen shown on the digital display in response to one or more user inputs to the digital user interface. These one or more user inputs may represent “swipes” on the digital user interface. In some examples, the HVAC controller may change the screen shown on the digital display in response to a rotation of a dial on the HVAC controller. In this way, the HVAC controller may change the screens based on two or more types of inputs, which is beneficial to improve a user experience with the HVAC controller as compared with HVAC controllers which do not update displayed data based on two or more types of inputs. 
     Each screen of the first set of screens may be associated with one or more screens of a second set of screens. The second set of screens may represent “details” screens which include at least some information not displayed on carousel screens. For example, each details screen that is associated with a carousel screen may include additional information corresponding to the respective carousel screen which is not included in the carousel screen itself. In this way, the screens displayed by the HVAC controller may represent a hierarchy of screens, such that it is possible to scroll laterally through the first set of screens and also move vertically between the first set of screens and corresponding screens of the second set of screens. It may be beneficial for the HVAC controller to change the screen displayed by the digital display both vertically and laterally so that information displayed by the HVAC controller is more easily navigable as compared with HVAC controllers which do not allow a change in display both laterally and vertically. 
     In some examples, a device for controlling one or more HVAC components within a building includes a rotatable dial, a digital user interface, and processing circuitry. The processing circuitry is configured to, in response to receiving a first rotation input via the rotatable dial while the digital user interface displays a first screen, cause a setpoint of the device to change in order to regulate a temperature within the building. In response to receiving a first touch input at the digital user interface while the digital user interface displays the first screen, the processing circuitry is configured to cause a menu of options being displayed on the digital user interface to change. In response to receiving a second rotation input via the rotatable dial while the digital user interface displays a second screen, the processing circuitry is configured to cause a selection being displayed on the digital user interface to change, and in response to receiving a second touch input via the digital user interface while the digital user interface displays the second screen, the processing circuitry is configured to cause the selection being displayed on the digital user interface to change. 
     In some examples, a method for controlling one or more HVAC components within a building includes, in response to receiving a first rotation input via a rotatable dial while a digital user interface displays a first screen, causing, by processing circuitry, a setpoint of the device to change. The method further includes, in response to receiving a first touch input at the digital user interface while the digital user interface displays the first screen, causing, by the processing circuitry, a menu of options to be displayed on the digital user interface to change. Additionally, the method includes, in response to receiving a second rotation input via the rotatable dial while the digital user interface displays a second screen, causing, by the processing circuitry, a selection being displayed on digital user interface to change and in response to receiving a second touch input via the digital user interface while the digital user interface displays the second screen, causing, by the processing circuitry, the selection being displayed on the digital user interface to change. 
     In some examples, a non-transitory computer-readable medium includes instructions for causing one or more processors of a device for controlling one or more HVAC components within a building to, in response to receiving a first rotation input via a rotatable dial while a digital user interface displays a first screen, cause a setpoint of the device to change, and in response to receiving a first touch input at the digital user interface while the digital user interface displays the first screen, cause a menu of options to be displayed on the digital user interface to change. Additionally, the instructions cause the one or more processors to, in response to receiving a second rotation input via the rotatable dial while the digital user interface displays a second screen, cause a selection being displayed on the digital user interface to change, and in response to receiving a second touch input via the digital user interface while the digital user interface displays the second screen, cause the selection being displayed on the digital user interface to change. 
     In some examples, a device for controlling one or more HVAC components within a building and controlling a digital user interface includes a dial, the digital user interface, and processing circuitry. The processing circuitry is configured to scroll, in response to detecting a set of user inputs to one or both of the digital user interface and the dial, through a sequence of carousel screens for display on the digital user interface and display, on the digital user interface after a period of time following a most recent user input of the set of user inputs, a default carousel screen of the sequence of carousel screens. Additionally, the processing circuitry is configured to display, on the digital user interface after a period of time following the display of the default carousel screen, an idle screen corresponding to the default carousel screen of the sequence of carousel screens. 
     In some examples, a method for controlling a digital user interface of a device configured to control one or more HVAC components within a building includes scrolling, by processing circuitry in response to detecting a set of user inputs to one or both of the digital user interface and a dial, through a sequence of carousel screens for display on the digital user interface and displaying, by the processing circuitry on the digital user interface after a period of time following a most recent user input of the set of user inputs, a default carousel screen of the sequence of carousel screens. Additionally, the method includes displaying, by the processing circuitry on the digital user interface after a period of time following the display of the default carousel screen, an idle screen corresponding to the default carousel screen of the sequence of carousel screens. 
     In some examples, a non-transitory computer-readable medium includes instructions for causing one or more processors of a device for controlling one or more HVAC components within a building and controlling a digital user interface to scroll, in response to detecting a set of user inputs to one or both of the digital user interface and a dial, through a sequence of carousel screens for display on the digital user interface and display, on the digital user interface after a period of time following a most recent user input of the set of user inputs, a default carousel screen of the sequence of carousel screens. Additionally, the instructions cause the one or more processors to display, on the digital user interface after a period of time following the display of the default carousel screen, an idle screen corresponding to the default carousel screen of the sequence of carousel screens. 
     The summary is intended to provide an overview of the subject matter described in this disclosure. It is not intended to provide an exclusive or exhaustive explanation of the systems, device, and methods described in detail within the accompanying drawings and description below. Further details of one or more examples of this disclosure are set forth in the accompanying drawings and in the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram illustrating an example heating, ventilation, and air conditioning (HVAC) system in a building, in accordance with one or more techniques described herein. 
         FIG. 2  is a block diagram illustrating an example HVAC controller including a digital display, in accordance with one or more techniques described herein. 
         FIG. 3  is a conceptual diagram illustrating an example screen hierarchy for one or more screens which may be displayed by a digital user interface, in accordance with one or more techniques described herein. 
         FIG. 4  is a conceptual diagram illustrating a rotation of a dial of an HVAC controller, in accordance with one or more techniques described herein. 
         FIG. 5  is a flow diagram illustrating an example operation for navigating a screen displayed by a digital display, in accordance with one or more techniques described herein. 
         FIG. 6  is a flow diagram illustrating an example operation for navigating one or more screens for display by a digital display, in accordance with one or more techniques described herein. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a block diagram illustrating an example heating, ventilation, and air conditioning (HVAC) system  10  in a building  12 , in accordance with one or more techniques described herein. HVAC system  10  includes HVAC component(s)  16 , a supply air duct  20 , a return air duct  22  (collectively, “ducts  20 ,  22 ”), dampers  24 , and air filters  26 . Additionally, HVAC system  10  includes an HVAC controller  30  configured to control HVAC component(s)  16  to regulate one or more parameters within building  12 . HVAC controller  30  may include a dial  32  and a digital user interface  34 . 
     HVAC system  10  may include one or more devices for regulating an environment within building  12 . For example, HVAC controller  30  may be configured to control the comfort level (e.g., temperature and/or humidity) in building  12  by activating and deactivating HVAC component(s)  16  in a controlled manner. HVAC controller  30  may be configured to control HVAC component(s)  16  via a wired or wireless communication link  42 . In some examples, a wired communication link  42  may connect HVAC component(s)  16  and HVAC controller  30 . HVAC controller  30  may be a thermostat, such as, for example, a wall mountable thermostat. In some examples, HVAC controller  30  may be programmable to allow for user-defined temperature set points to control the temperature of building  12 . Based on sensed temperature of building  12 , HVAC controller  30  may turn on HVAC component(s)  16  or turn off HVAC component(s)  16  in order to reach the user-defined temperature set point. Although this disclosure describes HVAC controller  30  (and controllers shown in other figures) as controlling HVAC component(s)  16 , external computing device  40  may also be configured to perform these functions. The techniques of this disclosure will primarily be described using examples related to temperature, but the systems, devices, and methods described herein may also be used in conjunction with other sensed properties, such as humidity or air quality. In some examples, HVAC controller  30  may be configured to control all of the critical networks of a building, including a security system. 
     HVAC component(s)  16  may provide heated air (and/or cooled air) via the ductwork throughout the building  12 . As illustrated, HVAC component(s)  16  may be in fluid communication with one or more spaces, rooms, and/or zones in building  12  via ducts  20 ,  22 , but this is not required. In operation, when HVAC controller  30  outputs a heat call signal to HVAC component(s)  16 , HVAC component(s)  16  (e.g., a forced warm air furnace) may turn on (begin operating or activate) to supply heated air to one or more spaces within building  12  via supply air ducts  20 . HVAC component(s)  16 , which include an air movement device  18  (e.g., a blower or a fan), can force the heated air through supply air duct  20 . In this example, cooler air from each space returns to HVAC component(s)  16  (e.g. forced warm air furnace) for heating via return air ducts  22 . Similarly, when a cool call signal is provided by HVAC controller  30 , a cooling device (e.g., an air conditioning (AC) unit) of HVAC component(s)  16  may turn on to supply cooled air to one or more spaces within building  12  via supply air ducts  20 . Air movement device  18  may force the cooled air through supply air duct  20 . In this example, warmer air from each space of building  12  may return to HVAC component(s)  16  for cooling via return air ducts  22 . 
     In some examples, HVAC component(s)  16  may include any one or combination of a fan, a blower, a furnace, a heat pump, an electric heat pump, a geothermal heat pump, an electric heating unit, an AC unit, a humidifier, a dehumidifier, an air exchanger, an air cleaner, a damper, a valve, and a fan, however this is not required. HVAC component(s)  16  may include any device or group of devices which contributes to regulating the environment within building  12  based on signals received from HVAC controller  30  or contributes to regulating the environment within building  12  independently from HVAC controller  30 . 
     Ducts  20 ,  22  may include one or more dampers  24  to regulate the flow of air, but this is not required. For example, one or more dampers  24  may be coupled to HVAC controller  30  and can be coordinated with the operation of HVAC component(s)  16 . HVAC controller  30  may actuate dampers  24  to an open position, a closed position, and/or a partially open position to modulate the flow of air from the one or more HVAC components to an appropriate room and/or space in building  12 . Dampers  24  may be particularly useful in zoned HVAC systems, and may be used to control which space(s) in building  12  receive conditioned air and/or receives how much conditioned air from HVAC component(s)  16 . 
     In many instances, air filters  26  may be used to remove dust and other pollutants from the air inside building  12 . In the example shown in  FIG. 1 , air filters  26  is installed in return air duct  22  and may filter the air prior to the air entering HVAC component(s)  16 , but it is contemplated that any other suitable location for air filters  26  may be used. The presence of air filters  26  may not only improve the indoor air quality but may also protect the HVAC component(s)  16  from dust and other particulate matter that would otherwise be permitted to enter HVAC component(s)  16 . 
     HVAC controller  30  may include any suitable arrangement of hardware, software, firmware, or any combination thereof. For example, HVAC controller  30  may include processing circuitry comprising microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or equivalent discrete or integrated logic circuitry, or a combination of any of the foregoing devices or circuitry. Accordingly, the processing circuitry may include any suitable structure, whether in hardware, software, firmware, or any combination thereof, to perform the functions ascribed herein to HVAC controller  30 . 
     Although not shown in  FIG. 1 , HVAC controller  30  may include a memory configured to store information within HVAC controller  30  during operation. The memory may include a computer-readable storage medium or computer-readable storage device. In some examples, the memory includes one or more of a short-term memory or a long-term memory. The memory may include, for example, random access memories (RAM), dynamic random access memories (DRAM), static random access memories (SRAM), magnetic discs, optical discs, flash memories, or forms of electrically programmable memories (EPROM) or electrically erasable and programmable memories (EEPROM). In some examples, the memory is used to store program instructions for execution by the processing circuitry of HVAC controller  30 . In some examples, the memory of HVAC controller  30  may be able to store data to and read data from memory included in external computing device  40  and/or memory included in external database  48 . The memory may be used for storing network settings such as an Internet Protocol (IP) address and/or a Media Access Control (MAC) address of HVAC controller  30 , external computing device  40 , and/or a router. 
     In some examples, HVAC controller  30  may include a set of wire terminals which make up a terminal block (e.g., a wall plate or a terminal plate) for receiving a set of control wires for one or more HVAC component(s)  16  of HVAC system  10 . The memory of HVAC controller  30  may store one or more wiring configurations for HVAC component(s)  16 , allowing HVAC controller  30  to determine which of HVAC component(s)  16  are connected to HVAC controller  30 . The memory of HVAC controller  30  may also store settings for HVAC system  10  which correspond to the one or more wiring configurations for HVAC component(s)  16 . For example, if HVAC controller  30  is wired to an AC unit of HVAC component(s)  16 , HVAC controller  30  may determine one or more settings for controlling the AC unit to turn on and turn off 
     In some examples, the memory of HVAC controller  30  may store program instructions, which may include one or more program modules, which are executable by HVAC controller  30 . When executed by HVAC controller  30 , such program instructions may cause HVAC controller  30  to provide the functionality ascribed to it herein. The program instructions may be embodied in software, firmware, and/or RAMware. 
     In some examples, HVAC controller  30  may include a dial  32  which is located at an outer circumference of HVAC controller  30 . HVAC controller  30  may be fixed to a wall or another surface such that dial  32  may be rotated relative to one or more other components (e.g., digital user interface  34 ) of HVAC controller  30 . Dial  32  may represent a user interface such that processing circuitry of HVAC controller  30  may receive, dial  32  and/or dial circuitry electrically connected to dial  32 , information indicative of a user input. In some examples, the user input may represent a user selection of a set point parameter value (e.g., a set point temperature), a user selection of information to be displayed by HVAC controller  30 , or a user selection of another setting. In some examples, dial  32  may smoothly rotate with respect to digital user interface  34 . In some examples, dial  32  may rotate with one or more steps such that as dial  32  rotates, dial  32  “snaps” into position after every interval of rotational distance. In some examples, dial  32  may smoothly rotate with respect to digital user interface  34  and HVAC controller  30  may output an audio signal (e.g., a clicking noise) for every interval of rotational position (e.g., every one degree) in which dial  32  rotates. 
     In some examples, dial  32  does not move inwards in response to a force applied to dial  32 . For example, dial  32  may rotate about a center axis which passes through a center of dial  32  without moving along the center axis in response to one or more forces applied to dial  32 . When HVAC controller  30  is mounted on a vertical surface such as a wall, HVAC controller  30  may prevent dial  32  from depressing inwards towards the vertical surface while allowing the dial  32  to rotate. 
     In some examples, dial  32  may include a set of light-emitting diodes (LEDs) configured to illuminate a portion or a whole of dial  32 , but this is not required. The processing circuitry of HVAC controller  30  may selectively illuminate one or more LEDs of the set of LEDs in order to indicate a set point temperature or convey other information. In some examples, the set of LEDs included in dial  32  may illuminate dial  32  to indicate that HVAC system  10  is in a heating mode or indicate that HVAC system  10  is in a cooling mode. For example, when HVAC system  10  is in a heating mode (e.g., HVAC controller  30  is outputting one or more instructions for HVAC component(s)  16  to increase a temperature within building  12 ), the LEDs of dial  32  cause dial  32  to illuminate at a first color. When HVAC system  10  is in a cooling mode (e.g., HVAC controller  30  is outputting one or more instructions for HVAC component(s)  16  to decrease a temperature within building  12 ), the LEDs of dial  32  cause dial  32  to illuminate at a second color. In this way, the LEDs of dial  32  may indicate whether HVAC system  10  is operating in the heating mode or the cooling mode. 
     Digital user interface  34  may include information relating to one or more aspects of an area in which HVAC controller  30  is located (e.g., a room in which HVAC controller  30  is located, a building in which HVAC controller  30  is located, an area outside of a building in which HVAC controller  30  is located, or any combination thereof). Digital user interface  34  may be round in shape and digital user interface  34  may be located an area within a circumference of dial  32  such that edges of dial  32  are visible around an outer circumference of digital user interface  34 . At least part of dial  32  and digital user interface  34  may represent an outer surface of HVAC controller  30 , allowing dial  32  and digital user interface  34  to receive user input. 
     In some examples, at least a portion of digital user interface  34  includes a digital display. The digital display may represent a user interface which permits a user to input various operating parameters (e.g., temperature set points, humidity set points, fan set points, starting times, ending times, schedule times, diagnostic limits, configuration settings, responses to alerts, and instructions to change a screen) to HVAC controller  30 . In some examples, digital user interface  34  may represent a physical user interface that is accessible at HVAC controller  30  and may include a touch screen (e.g., a full color touch screen display) and/or a distinct keypad. The digital display of digital user interface  34  may include any suitable display. In some examples, digital user interface  34  may include any one or combination of a liquid crystal display (LCD), an e-ink display, fixed segment display, or a dot matrix LCD display. In one or more examples where digital user interface  34  includes a distinct keypad, the distinct keypad may include a numerical keypad, a system of buttons, a control knob, or any combination thereof. HVAC controller  30  may, in some cases, display information and/or accept user inputs via the user interface of external computing device  40 . 
     A user may interact with HVAC controller  30  through a mobile phone, a tablet, a computer, or another device. For example, user devices  8 A- 8 N (collectively, “user devices  8 ”) may communicate with HVAC controller  30  via network  6 . HVAC controller  30  may, in some examples, be configured to communicate directly with network  6  without communicating with network  6  via a gateway device (e.g., a Wi-Fi router) within building  12 . In some examples, HVAC controller  30  may receive instructions from one or more of user devices  8 . The instructions may include, for example, a request to change a set point temperature for an area within building  12 . HVAC controller  30  may change the set point temperature in response to receiving the instruction. In turn, HVAC controller  30  may control HVAC component(s)  16  to control the temperature within building  12  to reach the new set point. 
     In some examples, digital user interface  34  may include a presence sensitive device to detect user inputs to HVAC controller  30 . Example presence-sensitive input displays include a resistive touchscreen, a surface acoustic wave touchscreen, a capacitive touchscreen, a projective capacitance touchscreen, a pressure sensitive screen, an acoustic pulse recognition touchscreen, or another presence-sensitive display technology. Digital user interface  34  of HVAC controller  30  may function as an output device using any one or more display devices, such as a liquid crystal display (LCD), dot matrix display, light emitting diode (LED) display, organic light-emitting diode (OLED) display, e-ink, or similar monochrome or color display capable of outputting visible information to a user. The user interface presented by the display of HVAC controller  30  may allow a user to program settings of HVAC controller  30 , set temperature zones for building  12 , configure desired temperatures for building  12  for different times of the day or days of the week, or other operating parameters. Digital user interface  34  of HVAC controller  30  may also be used to present user queries (e.g., what room HVAC controller  30  is installed in, what the address of building  12  is, what HVAC component(s)  16  are connected to HVAC controller  30 , etc.). Such queries may aid in installing and/or configuring HVAC controller  30  (e.g. when first connecting HVAC controller  30  to HVAC component(s)  16  of HVAC system  10 ). 
     In some examples, digital user interface  34  may be configured to display any one of a plurality of screens, wherein each screen of the plurality of screens is related to a specific one or more parameters or one or more topics corresponding to the building in which HVAC controller is placed. For example, the plurality of screens may include one or more time and outdoor temperature screens, one or more inside temperature screens, one or more air quality screens, one or more water usage screens, one or more energy usage screens, and one or more security screens, however this is not required. Additionally, or alternatively, the plurality of screens may include other types of screens. In some examples, the processing circuitry of HVAC controller  30  may receive a signal or a sequence of signals indicative of a user selection of a screen of the plurality of screens for display by HVAC controller  30 . For example, HVAC controller  30  may allow the set of screens to be scrolled across digital user interface  34 . 
     In some examples, the plurality of screens may include a first set of screens which represent a set of carousel screens. As described herein, the “set of carousel screens” refer to a set of screens which are arranged in a sequence of carousel screens, each carousel screen of the sequence of carousel screens being associated with a respective theme of a set of themes. The set of themes may include an indoor temperature theme, an outdoor temperature theme, an air quality theme, a water consumption theme, an energy consumption theme, and a security theme, or any combination thereof. Additionally, or alternatively, the set of themes may include one or more other themes. 
     When digital user interface  34  shows a carousel screen corresponding to the air quality theme, for example, digital user interface  34  may display information relating to an air quality within building  12  or outside of building  12 . For example, digital user interface  34  may display an air quality value within building  12 , wherein the air quality value is measured by an air quality sensor which is configured to communicate with HVAC controller  30  or located within HVAC controller  30 . While digital user interface  34  displays the carousel screen corresponding to the air quality theme, however, digital user interface  34  might not display information corresponding to other themes, such as temperature or security, as examples. 
     At a point in time, HVAC controller  30  may display a carousel screen of the set of carousel screens on digital user interface  34 . HVAC controller  30  may be configured to transition the carousel screen displayed on the digital user interface  34  by cycling through the sequence of carousel screens. Since the sequence of carousel screens is arranged in an order, HVAC controller  30  may be configured to cycle forwards and/or backwards through the sequence of carousel screens. 
     In some examples, the plurality of screens compatible for display by user interface  34  may also include a second set of screens representing a set of details screens, and a third set of screens representing a set of idle screens. As described herein, the “set of details screens” may include at least some information which is not included by the set of carousel screens. For example, each details screen that is associated with a carousel screen may include additional information corresponding to the respective carousel screen which is not included in the carousel screen itself. In this way, a details screen corresponding to a carousel screen may be associated with the same theme as the respective carousel screen. 
     In some examples, the plurality of screens compatible for display by user interface  34  may also include a third set of screens representing a set of idle screens. As described herein, the “set of idle screens” may represent one or more screens displayed by user interface  34  while HVAC controller  30  is operating in an idle state. Each idle screen of the set of idle screens may correspond to a respective carousel screen of the set of carousel screens. In some examples, each idle screen of the set of idles screens may be associated with a same theme of a corresponding carousel screen of the set of carousel screens. 
     In some examples, when a period of time elapses since a most recent user input is received by HVAC controller  30 , HVAC controller  30  may enter an idle state. When HVAC controller  30  is in the idle state, the processing circuitry of HVAC controller  30  may output an idle screen for display by digital user interface  34 . In some examples, the idle screen may include a set point temperature for an area within building  12  and/or a current temperature of the area within building  12 , but this is not required. In some examples, HVAC controller  30  may select the idle screen based on user input received by HVAC controller  30 . In some examples, HVAC controller  30  may select the idle screen based on information received from network  6 . In any case, when the period of time elapses since HVAC controller  30  receives the most recent user input, HVAC controller  30  may enter the idle state and display the idle screen on digital user interface  34 . 
     In some examples, responsive to detecting a rotation of dial  32  while HVAC controller  30  is in the idle state, HVAC controller  30  transitions out of the idle state to a temperature set point mode. HVAC controller  30  may change a temperature set point for an area within building  12  in response to detecting the rotation of dial  32 . In other words, HVAC controller  30  may determine that a rotation of dial  32  while HVAC controller  30  is in the idle state represents a user request to change a temperature set point. In transitioning out of the idle state, the processing circuitry of HVAC controller  30  may display the temperature set point for the area within building  12  on digital user interface  34 . Additionally, HVAC controller  30  may display the temperature set point changing as dial  32  rotates. For example, the digital user interface  34  may show the temperature setpoint cycle through a range of degrees, where each change from one degree to another degree is reflected on digital user interface  34 . In some examples, HVAC controller  30  may emit a noise each time the temperature set point changes from one degree value to another degree value. The noise may represent a clicking noise a, a tapping noise, or another type of noise. 
     HVAC controller  30  may be configured to perform one or more other actions in response to a rotation of dial  32  in addition to changing the temperature set point or alternatively to changing the temperature set point. For example, digital user interface  34  may receive a touch input which causes HVAC controller  30  to transition from a temperature set point mode to a display screen mode. When HVAC controller  30  transitions to the display screen mode, HVAC controller  30  may change a screen displayed on digital user interface  34  in response to detecting a rotation of dial  32 . For example, digital user interface  34  may display one or more of the set of carousel screens. As discussed above, the set of carousel screens represent a sequence of carousel screens, such that a change from one carousel screen to another carousel screen represents a change to an adjacent carousel screen of the sequence of carousel screens. In some examples, when dial  32  stops rotating, HVAC controller  30  may continue to display a carousel screen of the set of carousel screens displayed by digital user interface  34  at the time in which dial  32  stops rotating. 
     Additionally, or alternatively, HVAC controller  30  may be configured to change the carousel screen displayed by digital user interface  34  in response to one or more touch inputs to digital user interface  34  when HVAC controller is in the display screen mode. For example, the processing circuitry of HVAC controller  30  may detect a “swipe” input to digital user interface  34 . In response to detecting the swipe input, HVAC controller  30  may transition digital user interface  34  from displaying a first carousel screen to a second carousel screen, where the first carousel screen and the second carousel screen are adjacent in the sequence of carousel screens. In this way, HVAC controller  30  may be configured to change the screen displayed on digital user interface  34  based on one or both of a rotation of dial  32  and a touch input to digital user interface  34 . 
     It may be beneficial for HVAC controller  30  to have the ability to change the carousel screen based on one or both of the rotation of dial  32  and a touch input to digital user interface  34 , so that a user interaction with HVAC controller  30  is improved as compared with HVAC controllers that do not allow display change based on more than one type of user input. In other words, by transitioning HVAC controller  30  from a set point mode where a temperature set point is changed responsive to a rotation of dial  32  to a display screen mode where the screen displayed by digital user interface  34  is changed responsive to a rotation of dial  32  and/or a touch input to digital user interface  34 , HVAC controller  30  may provide a user with an efficient user experience. 
     HVAC controller  30  may include a communication device (not illustrated in  FIG. 1 ) to allow HVAC controller  30  to communicate via a wired or wireless connection  44  to external computing device  40 . The communication device may include a Bluetooth transmitter and receiver, a Wi-Fi transmitter and receiver, a Zigbee transceiver, a near-field communication transceiver, or other circuitry configured to allow HVAC controller  30  to communicate with external computing device  40 . In some examples, the communication device may allow HVAC controller  30  to exchange data with external computing device  40 . Examples of exchanged data include a desired temperature for building  12 , HVAC component(s)  16  connected to HVAC controller  30 , error codes, geographic location, estimated energy usage and cost, and/or other operating parameters or system performance characteristics for HVAC system  10 . 
     HVAC controller  30  may communicate via wired or wireless connection  44  with external computing device  40 . External computing device  40  may be, include, or otherwise be used in combination with a mobile phone, smartphone, tablet computer, personal computer, desktop computer, personal digital assistant, router, modem, remote server or cloud computing device, and/or related device allowing HVAC controller  30  to communicate over a communication network such as, for example, the Internet or other wired or wireless connection. Communicating via the wired or wireless connection  44  may allow HVAC controller  30  to be configured, controlled, or otherwise exchange data with external computing device  40 . In some examples, HVAC controller  30  communicating via wired or wireless connection  44  may allow a user to set up HVAC controller  30  when first installing the controller in building  12 . In some examples, HVAC controller  30  and external computing device  40  communicate through a wireless network device such as a router or a switch. In other examples, HVAC controller  30  and external computing device  40  communicate through a wired connection such as an ethernet port, USB connection, or other wired communication network. 
     HVAC controller  30  may, via the communication device, communicate via a wired or wireless connection  46  with external database  48 . In some examples, wired or wireless connection  46  enables HVAC controller  30  to communicate with external database  48  via a wireless connection which includes a network device such as a router, ethernet port, or switch. HVAC controller  30  and external database  48  may also communicate through a wired connection such as an ethernet port, USB connection, or other wired communication network. Communicating via the wired or wireless connection  46  may allow HVAC controller  30  to exchange data with external database  48 . As such, external database  48  may be at a location outside of building  12 . In some examples, external database  48  may be, include, or otherwise be used in combination with a remote server, cloud computing device, or network of controllers configured to communicate with each other. For example, HVAC controller  30  may receive data from HVAC controllers in nearby buildings through the internet or other city- or wide-area network. HVAC controller  30  may include the onboard database because it is unable to communicate via the communication device. 
     In some examples, external database  48  may be, or otherwise be included in, or accessed via, external computing device  40  (e.g., smartphone, mobile phone, tablet computer, personal computer, etc.). For example, HVAC controller  30  may communicate via a Wi-Fi network connection with a smartphone device to exchange data with external database  48 . By communicating via wired or wireless connection  46 , HVAC controller  30  may exchange data with external database  48 . 
     In some examples, HVAC controller  30  may display a setpoint as a bright white light at moving around a perimeter of HVAC controller  30 . As dial  32  rotates, the light may move with dial  32  to show a selected setpoint. If the setpoint is changed via a mobile application on one or more of user devices  8 , the light may move on HVAC controller  30  to show the selected setpoint. An application of one of user devices  8  may enable a user to view one or more aspects of HVAC controller  30 . 
     In some examples, if a Buoy water valve is installed, HVAC controller  30  may receive details on water usage and leak status. In some examples, if a security system is installed, HVAC controller  30  may control the security system. 
       FIG. 2  is a block diagram illustrating an example configuration of the HVAC controller  30  of  FIG. 1 , in accordance with one or more techniques described herein. As seen in  FIG. 2 , HVAC controller  30  includes dial  32 , digital user interface  34 , processing circuitry  52 , memory  54 , communication circuitry  56 , sensor(s)  58 , and terminal  62 . Sensor(s)  58  may, in some examples, include a temperature sensor  60 . HVAC controller  30  may be configured to communicate with HVAC component(s)  16  via terminal  62  and/or communicate with user devices  8  via network  6 . 
     HVAC controller  30  may be configured to control HVAC component(s)  16  in order to regulate one or more parameters of a space (e.g., a building, one or more rooms within a building, a large vehicle, or a vessel). In some examples, HVAC controller  30  regulates a temperature within the space. HVAC controller  30  may regulate the temperature of the space by using HVAC component(s)  16  to decrease a temperature of the space if the current temperature of the space is greater than a first set point temperature and/or increase a temperature of the space using HVAC component(s)  16  if the current temperature of the space is less than a second set point temperature. In some examples, the first set point temperature (e.g., a cooling set point temperature) is less than the second set point temperature (e.g., a heating set point temperature). In some examples, the first set point temperature is equal to the second set point temperature. 
     Processing circuitry  52  may include microprocessors, DSPs, ASICs, FPGAs, or equivalent discrete or integrated logic circuitry, or a combination of any of the foregoing devices or circuitry. Accordingly, processing circuitry  52  may include any suitable structure, whether in hardware, software, firmware, or any combination thereof, to perform the functions ascribed herein to HVAC controller  30 . 
     In some examples, memory  54  includes a computer-readable storage medium or computer-readable storage device. In some examples, memory  54  includes one or more of a short-term memory or a long-term memory. Memory  54  may include, for example, RAM, DRAM, SRAM, magnetic discs, optical discs, flash memories, or forms of EPROM or EEPROM. In some examples, memory  54  is used to store program instructions for execution by the processing circuitry of HVAC controller  30 . In some examples, the memory of HVAC controller  30  may be able to store data to and read data from memory included in external computing device  40  and/or memory included in external database  48 . The memory may be used for storing network settings such as an Internet Protocol (IP) address and/or a Media Access Control (MAC) address of HVAC controller  30 , external computing device  40 , and/or a router. 
     Communication circuitry  56  may include any suitable hardware, firmware, software or any combination thereof for communicating with another device, such as user devices  8  or other devices. Under the control of processing circuitry  52 , communication circuitry  56  may receive downlink telemetry from, as well as send uplink telemetry to, one of user devices  8  or another device with the aid of an internal or external antenna. Communication circuitry  56  may include a Bluetooth transmitter and receiver, a Wi-Fi transmitter and receiver, a Zigbee transceiver, a near-field communication transceiver, or other circuitry configured to allow HVAC controller  30  to communicate with one or more remote devices such as user devices  8 . In some examples, communication circuitry  56  may allow HVAC controller  30  to exchange data with external computing device  40  of  FIG. 1 . Examples of exchanged data include a desired temperature for the space, one or more control parameters for HVAC component(s)  16 , error codes, geographic location, estimated energy usage and cost, and/or other operating parameters or system performance characteristics for HVAC component(s)  16 . 
     In some examples, HVAC controller  30  includes one or more sensor(s)  58  including temperature sensor  60 . In some examples, temperature sensor  60  is located within a housing of HVAC controller  30 . In some examples, temperature sensor  60  is located remotely from HVAC controller  30  and may communicate with HVAC controller  30  via communication circuitry  56  or terminal  62 . For example, temperature sensor  60  may be located in the same room or the same area as HVAC controller  30  while being separate from HVAC controller  30  such that heat generated from components of HVAC controller  30  does not affect a temperature signal generated by temperature sensor  60 . It may be beneficial for temperature sensor  60  to be located separately from HVAC controller  30  in order to obtain an accurate temperature reading. In some examples where temperature sensor  60  is located within the housing of HVAC controller  30 , HVAC controller  30  may prevent components from affecting a temperature signal generated by temperature sensor  60 . In some examples, at least a portion of the housing of HVAC controller  30  may include stainless steel and the housing may be coated with a material which hides fingerprints. In some examples, the term “housing” may be used herein to describe an outer surface of HVAC controller  30 , including on outer surface of dial  32 , an outer surface of digital user interface  34 , and an outer face of HVAC controller  30  which is fixed to a wall or another surface. 
     In some examples, a housing of HVAC controller  30  may be substantially cylindrical in shape and dial  32  may represent a ring-shaped piece that is located at an outer circumference of HVAC controller  30 . In some examples, HVAC controller  30  includes a first face configured to be mounted on a plate which is fixed to a wall or another surface, a second face including a display, and a third face representing a side of HVAC controller  30 , the third face extending around a circumference of HVAC controller  30 . Dial  32  may include the third face of HVAC controller  30 . In some examples, dial  32  is configured to rotate with respect to one or more other components of HVAC controller  30 . For example, dial  32  is configured to rotate with respect to digital user interface  34 . In some examples, dial  32  is configured to rotate in response to a user input. Dial  32  may be electrically connected to dial circuitry (not illustrated in  FIG. 2 ) which may generate an electrical signal indicative of one or more rotational parameters (e.g., a rotational position, a rotational velocity, and/or a rotational acceleration) of dial  32 . The dial circuitry may output the electrical signal indicative of the one or more rotational parameters to processing circuitry  52 . In some examples, the dial circuitry is part of processing circuitry  52 . 
     Digital user interface  34  may be located on a face (e.g., the second face) of HVAC controller  30 . In some examples, digital user interface  34  may, in some cases, be substantially circular in shape. In some examples, digital display may include a presence sensitive device to detect user inputs to HVAC controller  30 . Example presence-sensitive input displays include a resistive touchscreen, a surface acoustic wave touchscreen, a capacitive touchscreen, a projective capacitance touchscreen, a pressure sensitive screen, an acoustic pulse recognition touchscreen, or another presence-sensitive display technology. Digital user interface  34  of HVAC controller  30  may function as an output device using any one or more display devices, such as an LCD, dot matrix display, LED display, OLED display, e-ink, or similar monochrome or color display capable of outputting visible information to a user. 
     In some examples, digital user interface  34  may display a set of carousel screens, which may represent a sequence of screens. In some examples, each screen of the set of carousel screens may be related to one or more parameters of an environment in which HVAC controller  30  is located, one or more settings of HVAC controller  30 , and/or one or more other aspects associated with HVAC controller  30 . For example, the set of carousel screens may include a time &amp; outdoor temperature screen, a comfort (e.g., inside temperature) screen, an air quality screen, a water screen, an energy screen, and a security screen. In some examples, digital user interface  34  may scroll through the carousel of screens based on two or more kinds of user input, such as a rotation of dial  32  and/or swipe inputs received by digital user interface  34 . In some examples, digital user interface  34  may scroll through the carousel of screens without user input. 
     Processing circuitry  52  may be configured to set and/or change one or more temperature set points corresponding to a space (e.g., a space within building  12 ). For example, a first set point temperature may represent a cooling set point temperature and a second set point temperature may represent a heating set point temperature. In some examples, if HVAC controller  30  is in a cooling mode and the current temperature is greater than the cooling set point temperature, processing circuitry  52  may control HVAC component(s)  16  to regulate the temperature in the space to reach the cooling set point temperature over a period of time based on the current temperature and the cooling set point temperature. In some examples, if HVAC controller  30  is in a heating mode and the current temperature is less than the heating set point temperature, processing circuitry  52  may control HVAC component(s)  16  to regulate the temperature in the space to reach the heating set point temperature over a period of time based on the current temperature and the heating set point temperature. 
     In some example, processing circuitry  52  is configured to receive an instruction to change and/or set one or more temperature set points of HVAC controller  30  from dial circuitry electrically connected to dial  32 , where the instruction is indicative of a user selection of one or more temperature set points using dial  32 . For example, in response to a first rotation of dial  32 , processing circuitry  52  may set the cooling temperature set point value to a first temperature value if a cooling set point mode of HVAC controller  30  is activated. In response to a second rotation of dial  32 , processing circuitry  52  may set the heating temperature set point value to a second temperature value if a heating set point mode of HVAC controller  30  is activated. Processing circuitry  52  may control whether HVAC controller is in the heating set point mode or the cooling set point mode based on one or more user inputs received from digital user interface  34 . In some examples, processing circuitry  52  is configured to receive an instruction to change and/or set one or more temperature set points of HVAC controller  30  from one or more of user devices  8  via network  6 . In any case, processing circuitry  52  may change the one or more temperature set points in response receiving instructions to change the one or more temperature set points. 
       FIG. 3  is a conceptual diagram illustrating an example screen hierarchy for one or more screens  300  which may be displayed by digital user interface  34 , in accordance with one or more techniques described herein. The one or more screens  300  include idle screens  302 - 312 , carousel screens  322 - 332 , and details screens  342 - 352 .  FIG. 3  is described with respect to HVAC system  10  and HVAC controller  30  of  FIG. 1  and  FIG. 2 . However, the techniques of  FIG. 3  may be performed by different components of HVAC system  10  and HVAC controller  30  or by additional or alternative systems or devices. 
     Processing circuitry  52  is configured to control which of screens  300  is displayed by digital user interface  34  at any given point in time. In some examples, processing circuitry  52  may change the screen displayed by digital user interface  34  in response to receiving one or more user inputs. In some examples, processing circuitry  52  may automatically change the screen displayed by digital user interface  34  without receiving any user inputs. Screens  300  are organized in a hierarchy which determines a manner in which processing circuitry  52  sets, changes, and transitions the screen displayed by digital user interface  34 . As seen in  FIG. 3 , idle screens  302 - 212  are located at a “top” of the hierarchy, carousel screens  322 - 332  are located below the idle screens  302 - 212  in the hierarchy, and details screens  342 - 352  are located below the carousel screens  322 - 332  in the hierarchy at the “bottom” of the hierarchy. 
     Screen transitions in the vertical direction  362  may be referred to herein as “vertical transitions.” Screen transitions in the horizontal direction  364  may be referred to herein as “horizontal transitions.” For example, a transition from displaying carousel screen  328  on digital user interface  34  to displaying idle screen  308  on digital user interface  34  may represent a vertical transition, since the transition is an upwards moment through the hierarchy along vertical direction  362 . A transition from displaying carousel screen  328  on digital user interface  34  to displaying carousel screen  330  on digital user interface  34  may represent a horizontal transition, since the transition is a sideways moment through the hierarchy along horizontal direction  364 . A group of screens which are arranged vertically in the hierarchy may be referred to as a “vertical grouping of screens.” For example, idle screen  304 , carousel screen  324 , and details screen  344  represent a vertical grouping of screens since idle screen  304  is an idle screen corresponding to carousel screen  324  and details screen  344  is a details screen corresponding to carousel screen  324 . 
     In some examples, processing circuitry  52  selects a vertical grouping of screens as a default vertical grouping of screens. The default vertical group of screens represents a vertical group of screens which HVAC controller  30  defaults to while HVAC controller  30  is in an idle state. HVAC controller  30  may enter the idle state when a period of time elapses following a most recent user input to HVAC controller  30 . HVAC controller  30  may remain in the idle state until HVAC controller  30  receives a user input. In one example, processing circuitry  52  may select idle screen  304 , carousel screen  324 , and details screen  344  (collectively, “screens  304 ,  324 ,  344 ”) as the default vertical group of screens. During the idle state, processing circuitry  52  may output the idle screen of the default vertical group of screens for display by digital user interface  34 . As such, when screens  304 ,  324 ,  344  represent the default vertical group of screens, processing circuitry  52  displays idle screen  304  while HVAC controller  30  is in the idle state. When HVAC controller  30  receives a user input (e.g., a touch input to digital user interface  34 ) after a time when HVAC controller  30  is in the idle state, processing circuitry  52  may vertically transition from displaying idle screen  304  to displaying carousel screen  324  on digital user interface  34 . 
     When processing circuitry  52  displays carousel screen  324  in response to a user touch input to digital user interface  34 , HVAC controller  30  may be in a display screen mode, and processing circuitry  52  may transition the screen displayed by digital user interface  34  based on one or both of swipe inputs to digital user interface  34  and rotations of dial  32 . That is, processing circuitry  52  may transition from displaying carousel screen  324  to displaying carousel screen  326  in response to detecting a rightward swipe input to digital user interface  34  or detecting a rightward rotation of dial  32  and processing circuitry  52  may transition from displaying carousel screen  324  to displaying carousel screen  322  in response to detecting a leftward swipe input to digital user interface  34  or detecting a leftward rotation of dial  32 . It may be beneficial for processing circuitry  52  to change the carousel screen based on two or more types of user input, such as rotations of dial  32  and/or swipe inputs to digital user interface  34 , so that a user experience with HVAC controller  30  is improved as compared with one or more HVAC controllers which do not change display screens based on two or more types of user input. Additionally, in some cases, it may be beneficial for processing circuitry  52  to change the carousel screen specifically based on rotations of dial  32  and/or swipe inputs to digital user interface  34  since rotating dial  32  and swiping on digital user interface  34  represent easy and natural ways to interact with HVAC controller  30 . 
     In some examples, processing circuitry  52  may cycle through more than one carousel screen of carousel screens  322 - 332  within a short period of time (e.g., less than 10 seconds). For example, processing circuitry  52  may transition from one carousel screen to another carousel screen after detecting a rotation of dial  32  by a threshold number of degrees. In other words, if dial  32  rotates continuously, processing circuitry  52  may cycle through several carousel screens. When dial  32  stops rotating, processing circuitry  52  may maintain a current carousel screen for display by digital user interface  34 . For example, in response to one rotation of dial  32 , processing circuitry  52  may transition from carousel screen  324  to carousel screen  326 , transition from carousel screen  326  to carousel screen  328 , and transition from carousel screen  328  to carousel screen  330 . Processing circuitry  52  may stop transitioning carousel screens at carousel screen  330  when dial  32  stops rotating. Subsequently, processing circuitry  52  may detect a “tap” touch input to digital user interface  34 , causing processing circuitry  52  to transition carousel screen  330  to details screen  350 . 
     In some examples, processing circuitry  52  may transition from displaying one carousel screen to an adjacent carousel screens in response to detecting one swipe input to digital user interface  34 . A swipe input may represent a horizontal user touch movement across digital user interface  34 . Horizontal swipe inputs may include rightwards swipe inputs and leftwards swipe inputs. When processing circuitry  52  detects two consecutive rightwards swipe inputs to digital user interface  34 , processing circuitry  52  may transition from displaying carousel screen  324  to displaying carousel screen  326  responsive to the first rightwards swipe and transition from displaying carousel screen  326  to displaying carousel screen  328  responsive to the second rightwards swipe. 
     Processing circuitry  52  may transition from a carousel screen to a respective details screen in response to receiving a tap input to digital user interface  34 . When digital user interface  34  is displaying carousel screen  322 , processing circuitry  52  may transition digital user interface  34  from displaying carousel screen  322  to displaying details screen  342  responsive to detecting a tap input to digital user interface  34 . When digital user interface  34  is displaying carousel screen  324 , processing circuitry  52  may transition digital user interface  34  from displaying carousel screen  324  to displaying details screen  344  responsive to detecting a tap input to digital user interface  34 . When digital user interface  34  is displaying carousel screen  326 , processing circuitry  52  may transition digital user interface  34  from displaying carousel screen  326  to displaying details screen  346  responsive to detecting a tap input to digital user interface  34 . When digital user interface  34  is displaying carousel screen  328 , processing circuitry  52  may transition digital user interface  34  from displaying carousel screen  328  to displaying details screen  348  responsive to detecting a tap input to digital user interface  34 . When digital user interface  34  is displaying carousel screen  330 , processing circuitry  52  may transition digital user interface  34  from displaying carousel screen  330  to displaying details screen  350  responsive to detecting a tap input to digital user interface  34 . When digital user interface  34  is displaying carousel screen  332 , processing circuitry  52  may transition digital user interface  34  from displaying carousel screen  332  to displaying details screen  352  responsive to detecting a tap input to digital user interface  34 . 
     Processing circuitry  52  may transition from displaying a carousel screen to displaying a corresponding idle screen in response to a period of time elapsing since a most recent user input to HVAC controller  30 . In some examples, the period of time is  45  seconds. When digital user interface  34  displays carousel screen  322  for a period of time after a most recent user input to HVAC controller  30 , processing circuitry  52  may transition to displaying idle screen  302  on digital user interface  34 . When digital user interface  34  displays carousel screen  324  for a period of time after a most recent user input to HVAC controller  30 , processing circuitry  52  may transition to displaying idle screen  304  on digital user interface  34 . When digital user interface  34  displays carousel screen  326  for a period of time after a most recent user input to HVAC controller  30 , processing circuitry  52  may transition to displaying idle screen  306  on digital user interface  34 . When digital user interface  34  displays carousel screen  328  for a period of time after a most recent user input to HVAC controller  30 , processing circuitry  52  may transition to displaying idle screen  308  on digital user interface  34 . When digital user interface  34  displays carousel screen  330  for a period of time after a most recent user input to HVAC controller  30 , processing circuitry  52  may transition to displaying idle screen  310  on digital user interface  34 . When digital user interface  34  displays carousel screen  332  for a period of time after a most recent user input to HVAC controller  30 , processing circuitry  52  may transition to displaying idle screen  312  on digital user interface  34 . 
     Processing circuitry  52  of may be configured to cause a set point to change in response to receiving a first rotation input via a dial  32  while digital user interface  34  displays a first screen. In some examples, the first screen includes one of idle screens  302 - 312  or one of carousel screens  322 - 332 . As such, a default function of dial  32  may be to control one or more set point temperature values. Subsequently, processing circuitry  52  may be configured to cause a menu of options to be displayed on digital user interface  34  to change in response to receiving a touch input at the digital user interface  34  while the digital user interface  34  displays the first screen. In some examples, the first touch input represents a user selection of a menu button on one of carousel screens  322 - 332 , causing digital user interface  34  to display a corresponding one of details screens  342 - 352 . 
     Processing circuitry  52  is configured to cause a selection being displayed on digital user interface  34  to change in response to receiving a rotation input via dial  32  while digital user interface  34  a second screen. In other words, while digital user interface  34  displays one of details screens  342 - 352 , dial  32  may control the selection being displayed on digital user interface  34  rather than controlling one or more temperature set points. Additionally, processing circuitry  52  may cause the selection being displayed on digital user interface  34  while the digital user interface  34  displays the second screen. In other words, touch input to digital user interface  34  may control the selection being displayed on digital user interface  34  in a similar manner to a rotation of dial  32  while digital user interface  34  displays one of details screens  342 - 352 . Thus, when some screens are being displayed dial  32  and digital user interface  34  may functional as alternative inputs that perform the same function, e.g., navigating a menu hierarchy. When other screens are being displayed, dial  32  and digital user interface  34  may perform different functions. As one example, when an idle screen or home screen is being displayed a rotation of dial  32  may cause a setpoint to change whereas a touch input at digital user interface  34  may cause a menu option to be selected. In some examples, digital user interface  34  is a full color touch screen. 
       FIG. 4  is a conceptual diagram illustrating a rotation of a dial  432  of an HVAC controller  430 , in accordance with one or more techniques described herein. As seen in  FIG. 4 , a first dial position “DIAL POSITION  1 ” represents a rotational position of dial  432  where point  412  is located at a top of HVAC controller, and a second dial position “DIAL POSITION  2 ” represents a rotational position of dial  432  the first dial position. Point  412  represents a reference point to show one example rotation of dial  432 . Point  412  is not necessarily visible on the face of dial  432 . In one example, the clockwise rotation of dial  432  causes processing circuitry of HVAC controller  430  to increase temperature displayed on digital user interface  434  to from 72° to 74°, but this is not required. The processing circuitry may perform one or more other actions in response to detecting the rotation of dial  432 . 
       FIG. 5  is a flow diagram illustrating an example operation for navigating a screen displayed by digital user interface  34 , in accordance with one or more techniques described herein.  FIG. 5  is described with respect to HVAC system  10  and HVAC controller  30  of  FIG. 1  and  FIG. 2 . Additionally,  FIG. 5  is described with respect to idle screens  302 - 312 , carousel screens  322 - 332 , and details screens  342 - 352  of  FIG. 3 . However, the techniques of  FIG. 5  may be performed by different components of HVAC system  10  and HVAC controller  30  or by additional or alternative devices. 
     Processing circuitry  52  of HVAC controller  30  may be configured to cause a set point to change in response to receiving a first rotation input via a dial  32  while digital user interface  34  displays a first screen ( 502 ). In some examples, the first screen includes one of idle screens  302 - 312  or one of carousel screens  322 - 332 . As such, a default function of dial  32  may be to control one or more set point temperature values. Subsequently, processing circuitry  52  may be configured to cause a menu of options to be displayed on the digital user interface  34  to change in response to receiving a first touch input at the digital user interface  34  while the digital user interface  34  displays the first screen ( 504 ). In some examples, the first touch input represents a user selection of a menu button on one of carousel screens  322 - 332 , causing digital user interface  34  to display a corresponding one of details screens  342 - 352 . 
     Processing circuitry  52  is configured to cause a selection being displayed on the digital user interface  34  to change in response to receiving a second rotation input via the dial  32  while the digital user interface  34  displays a second screen ( 506 ). In other words, while digital user interface  34  displays one of details screens  342 - 352 , dial  32  may control the selection being displayed on digital user interface  34  rather than controlling one or more temperature set points. Additionally, processing circuitry  52  may cause the selection being displayed on the digital user interface  34  to change in response to receiving a second touch input via the digital user interface  34  while the digital user interface  34  displays the second screen ( 508 ). In other words, touch input to digital user interface  34  may control the selection being displayed on digital user interface  34  in a similar manner to a rotation of dial  32  while digital user interface  34  displays one of details screens  342 - 352 . Thus, when some screens are being displayed dial  32  and digital user interface  34  may functional as alternative inputs that perform the same function, e.g., navigating a menu hierarchy. When other screens are being displayed, dial  32  and digital user interface  34  may perform different functions. As one example, when an idle screen or home screen is being displayed a rotation of dial  32  may cause a setpoint to change whereas a touch input at digital user interface  34  may cause a menu option to be selected. In some examples, the digital user interface  34  includes a full color touch screen. 
       FIG. 6  is a flow diagram illustrating an example operation for navigating one or more screens for display by digital user interface  34 , in accordance with one or more techniques described herein.  FIG. 6  is described with respect to HVAC system  10  and HVAC controller  30  of  FIG. 1  and  FIG. 2 . Additionally,  FIG. 6  is described with respect to idle screens  302 - 312 , carousel screens  322 - 332 , and details screens  342 - 352  of  FIG. 3 . However, the techniques of  FIG. 6  may be performed by different components of HVAC system  10  and HVAC controller  30  or by additional or alternative devices. Processing circuitry  52  may be configured to scroll through a sequence of carousel screens  322 - 332  for display on the digital user interface  34  in response to detecting a set of user inputs to one or both of the digital user interface  34  and the dial  32  ( 602 ). Subsequently, digital user interface  34  may display, on the digital user interface  34  after a period of time following a most recent user input of the set of user inputs, a default carousel screen of the sequence of carousel screens ( 604 ). Processing circuitry  52  may display, on the digital user interface  34  after a period of time following the display of the default carousel screen, an idle screen corresponding to the default carousel screen of the sequence of carousel screens ( 606 ). 
     In one or more examples, the functions described may be implemented in hardware, software, firmware, or any combination thereof If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media may include computer-readable storage media, which corresponds to a tangible medium such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another, e.g., according to a communication protocol. In this manner, computer-readable media generally may correspond to (1) tangible computer-readable storage media which is non-transitory or (2) a communication medium such as a signal or carrier wave. Data storage media may be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, code and/or data structures for implementation of the techniques described in this disclosure. A computer program product may include a computer-readable medium. 
     By way of example, and not limitation, such computer-readable storage media can include one or more of RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage, or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if instructions are transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. It should be understood, however, that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transitory media, but are instead directed to non-transitory, tangible storage media. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. 
     Instructions may be executed by one or more processors, such as one or more DSPs, general purpose microprocessors, ASICs, FPGAs, or other equivalent integrated or discrete logic circuitry. Accordingly, the term “processor” or “processing circuitry,” as used herein may refer to any of the foregoing structure or any other structure suitable for implementation of the techniques described herein. In addition, in some aspects, the functionality described herein may be provided within dedicated hardware and/or software modules. Also, the techniques could be fully implemented in one or more circuits or logic elements. 
     The techniques of this disclosure may be implemented in a wide variety of devices or apparatuses, including a wireless handset, an integrated circuit (IC) or a set of ICs (e.g., a chip set). Various components, modules, or units are described in this disclosure to emphasize functional aspects of devices configured to perform the disclosed techniques, but do not necessarily require realization by different hardware units. Rather, as described above, various units may be combined in a single hardware unit or provided by a collection of interoperative hardware units, including one or more processors as described above, in conjunction with suitable software and/or firmware. 
     Various examples have been described. These and other examples are within the scope of the following claims.