# Patent

## Title
Transmitter with battery status indicator

## Abstract

A battery powered transmitter is provided with a battery status circuit that determines an output voltage level associated with the battery. The battery status circuit is provided with multiple voltage reference thresholds. One or more visual voltage status indicators are electrically coupled with the battery status circuit. The battery status circuit actuates a visual voltage status indicator when the battery status circuit determines the voltage output level of the battery to be within a first output range. One or more additional visual voltage status indicators may be actuated when the battery status circuit determines the voltage output level of the battery to be within other output ranges.

## Background
RELATED APPLICATION
This is a continuation of U.S. patent application Ser. No. 12/205,533 filed on 5 Sep. 2008, now issued as U.S. Pat. No. 8,547,240, the disclosure of which is incorporated, in its entirety, by this reference.


BACKGROUND
Hand-held transmitters have become fairly ubiquitous. Many people operate such transmitters to open and close garage doors, activate and deactivate security systems for automobiles, automated gates, and control a wide array of basic systems such as irrigation systems, and the like. A typical hand-held transmitter is battery powered and includes a transmitter that may be associated with a controller circuit, which contains the data that is transmitted from the system. Other, more complex systems may include receivers and other circuits designed for different functions. However, all of these functions draw power from the battery, which is typically provided with a single, non-renewable charge.
When the battery within a transmitter loses its charge, the transmitter loses or has diminished functionality. In many instances, this may mean that an individual is locked out of a garage or an automobile. This may prove to be more than a simple inconvenience, such as when an alarm system or irrigation system operates solely on remote controlled access. Typically, an individual is left with a transmitter having insufficient voltage to operate and no back-up batteries readily available. Carrying around a supply of batteries is impractical. Accordingly, users are forced to simply wait for the battery within the transmitter to expire due to a lack of adequate forewarning. Only with such forewarning can users safely and conveniently replace transmitter batteries prior to their expiration.
Various prior art transmitting devices have been provided with an audible or visual indicator to advise their users that power within the devices had nearly expired. However, such systems would only have enough power to warn users of a low battery condition, but not enough power to operate the device. Sometimes users have found themselves in situations that have made it inconvenient, if not impossible, to stop what they were doing and find a location that sells the right replacement battery. In such instances, the users have invariably needed to continue use of the transmitters as the low battery signal was activated. This has left the users wondering how many transmissions were possible with the existing battery, hoping the power would not expire before the need for the transmitter was satisfied. None of the prior art systems have provided multi-staged voltage status indications that permitted casual continued use of the transmitters without fear of the transmitters dying at the wrong time.
Another issue related to low battery conditions in portable transmitters has centered on the power demand of various transmitters. In many instances, transmitting devices are provided as multi-tasking devices that include, transmitters, receivers, controller circuits, lit displays, and the like. As such, use of such transmitters has depleted the battery supply more rapidly than single use transmitters. A last-minute low-battery warning to a user may be far too late to do any good. The power consumption needs of some transmitting devices would fully deplete a low voltage supply shortly after the low-battery warning could be issued.
SUMMARY
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary, and the foregoing Background, is not intended to limit the claimed subject matter.
A system for transmitting a signal is generally provided with a battery, a transmitter and a battery status circuit. The transmitter and battery status circuit may be electrically coupled with the battery according to various different embodiments. In one aspect, the battery status circuit is provided to determine a voltage output level associated with the battery. A voltage reference circuit may be associated with the battery status circuit. In at least one embodiment, the voltage reference circuit is provided with a plurality of different voltage thresholds. One or more visual voltage status indicators may be electrically associated with the battery status circuit. In at least one embodiment, the battery status circuit may be provided to actuate one or more visual voltage status indicators when the battery status circuit determines the voltage output level of the battery to be at or near one or more predetermined levels.
In one aspect, one or more LEDs are provided to serve as the one or more visual voltage status indicators. In one embodiment, the one or more LEDs emit different colored lights, with each color corresponding to a different voltage output level. Exemplary voltage output levels may include approximations of a 50% charged battery and a 25% charged battery.
In another embodiment, the system functions at least in part as a transmitter for operating a garage door or automated gate. As such, a controller circuit may be electrically coupled with the transmitter and provided with data that is coded to actuate one or more garage door openers. However, it is contemplated that the system offers sufficient flexibility to be used in conjunction with a nearly endless list of wireless transmitter operations and is not limited to the operation of garage door openers.
These and other aspects of the present system and method will be apparent after consideration of the Detailed Description and Figures herein.



DRAWINGS
Non-limiting and non-exhaustive embodiments of the present invention, including the preferred embodiment, are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified.
FIG. 1 depicts a front perspective view of one embodiment of a transmitter with a battery status indicator according to the present technology.
FIG. 2 depicts a front elevation view of another embodiment of a transmitter with a battery status indicator according to the present technology.
FIG. 3 depicts a schematic diagram of an example of a transmitter with a battery status indicator according to the present technology.
FIG. 4 depicts a flow diagram illustrating a method for battery status detection according to the present technology.



DETAILED DESCRIPTION
Embodiments are described more fully below with reference to the accompanying figures, which form a part hereof and show, by way of illustration, specific exemplary embodiments. These embodiments are disclosed in sufficient detail to enable those skilled in the art to practice the invention. However, embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. The following detailed description is, therefore, not to be taken in a limiting sense.
Referring to FIG. 1, there is illustrated a transmitter 10 that may be used for a wide array of wireless transmission purposes, such as activating an automated garage door opener. A housing 12 (i.e., a compact, handheld housing) is formed using one of various conventional known methods, such as various molding processes that use plastic and other formable materials. An activation button 14 is disposed within an opening formed in the housing 12 so that a user may conveniently engage the activation button 14 for when using the transmitter 10. One or more visual voltage status indicators 16 may be associated with the housing 12 in a position that provides a user with an unobstructed view of the visual voltage status indicators 16 when the transmitter 10 is in use. With reference to FIG. 2, a transmitter 10 is depicted as being provided with three visual voltage status indicators 16. As will be discussed at further length below, one or more visual voltage status indicators 16 may be associated with the transmitter 10 according to the intended functionality of the transmitter 10. In some embodiments, the visual voltage indicators may be provided as one or more light-emitting diodes (LEDs). Single color LEDs may be used where a plurality of visual voltage indicators 16 are provided. In such an embodiment, the individual visual voltage indicators may be associated with a particular color that denotes a particular output voltage. However, in other embodiments, one or more multicolor LEDs may be used. For example, a single multicolor LED may be provided to emit a different color of light for each of a plurality of different output voltages. More specifically, a tri-color LED may be utilized.
The output voltage of a battery will gradually drop from an initial fully-charged value, V0, as the battery's charge is depleted with normal operation of the device to which it is attached. The output voltage gradually drops until it reaches a first threshold voltage, V1. The operating region between V0 and V1 may be commonly described as an optimal operating region of the device to which the battery is attached. In a transmitting device, such as a garage door opener, a user will typically not perceive any loss in effectiveness of the transmitting device even though the battery output voltage may have dropped significantly from its initial value. Oftentimes, the transmitting device will operate in the optimal operating region for a relatively long time. Even after the battery output voltage has dropped below V1, a battery operated transmitting device such as a garage door opener may continue to function normally for some time, as long as the battery output voltage does not drop below a second threshold voltage, V2. While the transmitting device may operate in the suboptimal voltage region between V1 and V2, the operational effectiveness of the transmitting device will begin to degrade over time. However, when the transmitting device begins to operate in this suboptimal region, the user should be warned that the battery will need to be replaced in the near future. Below the second threshold voltage V2, the performance of the transmitting device will continue to degrade until the device becomes inoperable.
It is contemplated that the values of V1 and V2 are dependent on the circuit configuration and application requirements of each battery operated device used. Determining these values, however, is easily determined using conventional experimental methods. In transmitting devices such as garage door operators, the values of V1 and V2 depend on the type and quality of equipment used to receive signals (e.g., a receiver's ability to receive different signal strengths) from the transmitting device and open the garage door. Other environmental conditions that interfere with the transmitting and receiving signals may further bear on the values of V1 and V2. Accordingly, the threshold voltage values are preferably determined using an experimental process based, at least in part, on the type of transmitting and receiving equipment to be used, the surrounding environmental conditions, and the intended use of the equipment. For example, in some embodiments, the values for V1 and V2 may be set at 50% and 25%, respectively, of the nominal value of V0 for a typical battery. However, these exemplary values may be inadequate for use with other implementations. Accordingly, the values may be modified according to the facts presented. Moreover, some applications may make it desirable to include additional threshold voltage values, creating additional voltage ranges that may be identified and/or monitored.
With reference to FIG. 3, an exemplary circuit diagram is depicted as including a controller circuit, which may be of a type commercially available for operating garage door openers. However, FIG. 3 further depicts an exemplary battery status indicator circuit that is operatively integrated with the controller circuit to form microcontroller U1. The elements of these circuits are identified herein by the reference numerals indicated in FIG. 3. Certain elements described herein have dual designations for the purpose of Table I which follows.










TABLE I







Reference No.
Description









C1
Capacitor 104P



C2
Capacitor 104P



C3
Capacitor 102P



C4
Capacitor



C5
Capacitor 4P



C6
Capacitor 106P



C7
Capacitor 106P



L1
Inductor



Q1
Transistor HT7022A



Q2
Transistor H-10



Q3
Transistor HT7130



Q4
Transistor HT7050A



R1
Resistor 1.2K



R2
Resistor 1.2K



R3
Resistor 47K



R4
Resistor 100K



R5
Resistor 220R



R6
Resistor 100K



R7
Resistor 100K



S1
Switch 8 Port



S2
Switch 10 Port



U1
Microcontoller Circuit SN2613



Y1
Clock Circuit 300 MHz










In the exemplary circuit depicted in FIG. 3, power (such as nine volt DC power) is supplied to the microcontroller circuit U1 by a battery that is electrically coupled with the transmitter 10. Power is directed through transistor Q4 to the microcontroller U1 and may provide a reference to the microcontroller U1 as to the actual voltage supply coming from the battery. Transistor Q1 is also electrically coupled with the battery and microcontroller U1. Capacitor C1 is associated with transistor Q1 and provided to serve as a voltage reference for the microcontroller U1, such as V1. Similarly, transistor Q3 is electrically coupled with the battery and microcontroller U1. Capacitor C7 is associated with transistor Q3 and provided to serve as another voltage reference for the microcontroller U1, such as V2.
The microcontroller circuit U1, is situated within the circuit and provided with logic to: (a) operate a transmitting function of the transmitter 10, including the storage of data (such as garage door opener codes) relative to the transmitting function; (b) receive voltage input from transistors Q4, Q1 and Q3; (c) compare a voltage supply reading from transistor Q4 with voltage input received from transistors Q1 and Q3; and (d) actuate one or more visual voltage indicators 16 according to the comparison of voltage supply to voltage input received from transistors Q1 and Q3. Accordingly, in some embodiments, specific logic associated with microcontroller U1 measures the voltage of the battery associated with the transmitter 10 and enables one or more visual voltage indicators 16 if battery voltage falls below one or more predetermined voltage levels.
Operation of the transmitter 10 is believed to be readily understandable from the foregoing description and consideration of FIG. 3. However, FIG. 4 presents a flow diagram that illustrates an exemplary embodiment of a method 100 for determining and indicating battery status according to aspects of the present technology. The method begins at step 105 and at 110 at least two threshold voltages V1 and V2 mentioned above are determined. It is contemplated that step 110 may be performed experimentally during the design process for a particular transmitting device so that the voltage thresholds are fixed at predetermined values throughout operation of the transmitting device. It is contemplated, however, that the threshold voltages may be variable to enable a user to adapt operation of the transmitting device and the manner in which its battery voltage supply is monitored.
At step 115, the battery output voltage is measured. The output voltage in some embodiments is measured at specified sampling intervals that are determined according to the requirements of each implementation. In one embodiment, where the transmitting device is used to operate garage door openers, the output voltage may be measured at each activation of the transmitter 10. At step 120, the measured battery output voltage is compared with the threshold voltages V1 and V2. While some embodiments perform this step within microcontroller U1, the measuring and comparing steps may be performed using a plurality of conventional comparator and reference circuits known to those skilled in the art.
If the measured battery output voltage at step 120 is determined to be equal to or greater than threshold voltage V1, microcontroller U1 will actuate the first visual voltage indicator. In some embodiments, the first visual voltage indicator will be provided by a green light that is visible to the user. Where the output voltage is determined at step 120 to be between threshold voltages V1 and V2, microcontroller will actuate the second visual voltage indicator. In some embodiments, the second visual voltage indicator is provided by a yellow light that is visible to the user. However, if the measured battery output voltage at step 120 is determined to be less than threshold voltage V2, microcontroller U1 will actuate the third visual voltage indicator. Various embodiments may use a red light, visible to the user, as the third visual voltage indicator. It is contemplated that one or more lights, such as LEDs may be used to emit the aforementioned lights in various different colors according to nearly any desired notification pattern.
In some embodiments, an unqualified measurement of the battery output voltage will cause the process to loop to step 115. Some embodiments may continue this loop at regular intervals even though one or more visual voltage indicators have been actuated by the microcontroller U1 following step 120. Still other embodiments may simply initiate the method 200 on activation of the transmitter 10 and terminate the method 200 after the actuation of a visual voltage indicator. In this manner, power within the transmitter 10 may be conserved and an indication of the battery status provided to the user only on activation of the transmitter 10.
Construction and operation of the transmitter 10 is believed to be understandable to those skilled in the art based on the foregoing description read in conjunction with the drawings. Conventional materials may be used to fabricate the housing 12 for the transmitter 10 and components described herein which are not otherwise described with respect to the type of material to be used for fabrication thereof.
Although the system has been described in language that is specific to certain structures, materials, and methodological steps, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific structures, materials, and/or steps described. Rather, the specific aspects and steps are described as forms of implementing the claimed invention. Since many embodiments of the invention can be practiced without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended. Unless otherwise indicated, all numbers or expressions, such as those expressing dimensions, physical characteristics, etc. used in the specification (other than the claims) are understood as modified in all instances by the term “approximately.” At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the claims, each numerical parameter recited in the specification or claims which is modified by the term “approximately” should at least be construed in light of the number of recited significant digits and by applying ordinary rounding techniques. Moreover, all ranges disclosed herein are to be understood to encompass and provide support for claims that recite any and all subranges or any and all individual values subsumed therein. For example, a stated range of 1 to 10 should be considered to include and provide support for claims that recite any and all subranges or individual values that are between and/or inclusive of the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more and ending with a maximum value of 10 or less (e.g., 5.5 to 10, 2.34 to 3.56, and so forth) or any values from 1 to 10 (e.g., 3, 5.8, 9.9994, and so forth).

## Claims

1. A system for transmitting a signal, the system comprising:
a battery having a voltage supply level;
a transmitter electrically coupled with the battery, the transmitter having a button, the transmitter transmitting data via a signal when a user presses the button;
a controller circuit, the controller circuit electrically coupled with the transmitter, the controller circuit having data transmittable by the transmitter, the data coded to actuate a garage door opener; and
a battery status circuit, the battery status circuit comprising a voltage reference circuit and a comparator circuit, the battery status circuit electrically coupled with the battery to determine the voltage supply level of the battery each time the transmitter transmits data by measuring a reduction in a voltage level across at least one circuitry element electrically coupled to the battery status circuit, the voltage level indicating a present strength of the signal of the transmitter,
the battery status circuit receiving a first voltage input from a first transistor, the first voltage input representing an actual voltage supply level of the battery,
the battery status circuit receiving a second voltage input from a second transistor, the second voltage input representing a first voltage threshold, and
the battery status circuit receiving a third voltage input from a third transistor, the third voltage input representing a second voltage threshold,
wherein
the first voltage threshold is determined by determining a receiver's ability to receive signals at a first signal strength from the transmitter, environmental conditions, and an intended use of the transmitter, the first threshold approximating the voltage output of a charged battery at a first level;
the second voltage threshold is determined by determining the receiver's ability to receive signals at a second signal strength from the transmitter, environmental conditions, and an intended use of the transmitter, the second threshold approximating the voltage output of the charged battery at a second level, the second level being less than the first level;


a first, a second, and a third voltage status light emitting diode (LED), each of the voltage status LEDs electrically coupled with the battery status circuit, the first voltage status LED emitting a first color of light, the second voltage status LED emitting a second color of light, and the third voltage status LED emitting a third color of light, the colors of light each being different and each representing a particular different output voltage,
the battery status circuit actuating the first voltage status LED according to a first predetermined pattern when the actual voltage supply level of the battery is above the first voltage threshold,
the battery status circuit actuating the second voltage status LED according to a second predetermined pattern when the actual voltage supply level of the battery is between the first voltage threshold and the second voltage threshold, and
the battery status circuit actuating the third voltage status LED according to a third predetermined pattern when the actual voltage supply level of the battery is lower than the second voltage threshold; and

the battery, the transmitter, the controller circuit, and the battery status circuit are enclosed in a housing.

2. The system of claim 1, wherein the housing is a handheld housing for performing portable transmissions.

3. The system of claim 1, wherein the first voltage threshold is set at fifty percent of a nominal value of the battery.

4. The system of claim 3, wherein the second voltage threshold is set at twenty-five percent of the nominal value of the battery.

5. The system of claim 1, wherein the second voltage threshold is set at twenty-five percent of a nominal value of the battery.

6. The system of claim 1, wherein the battery status circuit receives the first voltage input from the first transistor at a specified sampling interval.

7. The system of claim 1, wherein the battery status circuit receives the first voltage input from the first transistor at each transmission of data of the transmitter.

8. The system of claim 1, wherein the controller circuit is selected from a group consisting of: (a) a microcontroller and (b) a plurality of comparator and reference circuits.

9. The system of claim 1, wherein the first color of light is green, the second color of light is yellow, and the third color of light is red.

10. The system of claim 1, wherein the transmitter is inoperable to transmit data when the actual voltage supply level of the batter is lower than the second voltage threshold.