Sensors for detecting presence, occupancy, and/or motion and related systems and methods
A motion sensor assembly may include a cover plate configured to be mounted to an electrical box. The cover plate may include a front surface configured to face away from the electrical box and a rear surface opposite the front surface. The cover plate may further include an aperture configured to receive a toggle or rocker type switch. A motion sensor may be coupled to the cover plate. A power source and processor may be operably coupled to the motion sensor. Furthermore, the processor may be operably coupled to a communication device.
1. A motion sensor assembly, comprising:
a cover plate comprising a cover plate aperture that permits a portion of an electrical component in an electrical box to pass through the cover plate when the cover plate at least partially covers the electrical box;
a temperature sensor;
a motion sensor;
a communication device; and
circuitry comprising a controller, wherein:
the controller is configured to receive motion signals from the motion sensor,
the circuitry is configured to adjust a voltage window based on a temperature sensed by the temperature sensor,
the controller is configured to compare the motion signals to the voltage window that specifies a range of amplitude sensitivities,
based on the range of amplitude sensitivities, the controller is configured to cause the circuitry to reject signal amplitudes of the motion signals associated with motions of animals and accept signal amplitudes of the motion signals associated with motions of persons,
the circuitry is configured to filter frequencies associated with the motions of the animals from the motion signals to obtain filtered signals and detect movement based on the filtered signals, and
the communication device is configured to transmit an indication of the detected movement.
2. The motion sensor assembly of claim 1 , wherein the cover plate aperture is sized and positioned to receive a switch of the electrical component when the cover plate covers the electrical box.
3. The motion sensor assembly of claim 1 , wherein the communication device is configured to electromagnetically transmit the indication of the detected movement across an air gap to wiring powering the electrical component.
4. The motion sensor assembly of claim 1 , comprising:
a circuit board to which the controller is mounted; and
a spiral antenna around an outer periphery of the circuit board; and
wherein the communication device is configured to transmit the indication of the detected movement via the spiral antenna.
5. The motion sensor assembly of claim 1 , comprising:
an additional sensor; and
wherein the controller is configured to increase a frequency at which readings are obtained from the additional sensor in response to the detected movement.
6. The motion sensor assembly of claim 1 , comprising:
a circuit board comprising a circuit board aperture that passes through the circuit board;
wherein the circuit board is mounted to the cover plate such that the circuit board aperture aligns with the cover plate aperture; and
the portion of the electrical component passes through the circuit board aperture when the cover plate covers the electrical box.
7. The motion sensor assembly of claim 1 , comprising a circuit board, wherein:
the cover plate comprises a cover plate front side, a cover plate rear side, and a user interface element in the cover plate rear side;
the circuit board is operably coupled to the user interface element of the cover plate rear side; and
the controller is mounted to the circuit board.
8. The motions sensor assembly of claim 7 , wherein:
the circuit board comprises a circuit board front side adjacent the cover plate and a circuit board rear side;
wherein the circuit board rear side does not extend beyond the user interface element in the cover plate rear side.
9. A motion sensor assembly comprising:
a cover plate comprising a cover plate aperture that permits a portion of an electrical component in an electrical box to pass through the cover plate when the cover plate at least partially covers the electrical box;
a temperature sensor;
a motion sensor;
a communication device; and
circuitry comprising a processor, wherein:
the processor is configured to receive motion signals from the motion sensor,
the circuitry is configured to adjust a reference voltage based on a temperature sensed by the temperature sensor,
the processor is configured to compare the motion signals to a voltage window that specifies a range of amplitude sensitivities;
based on the range of amplitude sensitivities, the processor is configured to cause the circuitry to reject signal amplitudes of the motion signals associated with motions of animals and accept signal amplitudes of the motion signals associated with motions of persons;
the circuitry is configured to compare the motion signal to the reference voltage and signal a state change based on a relationship of the motion signal to the reference voltage, and
the communication device is configured to transmit an indication of the detected state change.
10. The motion sensor assembly of claim 9 , comprising:
a lens that protrudes from a cover plate front side of the cover plate; and
wherein the motion sensor is positioned behind the lens and configured to generate the motion signals based on radiation received via the lens.
11. The motion sensor assembly of claim 10 , wherein the lens is a multi-faceted lens that causes the motion sensor to vary the motion signals as an object moves across a field of view of the motion sensor and from facet to facet of the lens.
12. The motion sensor assembly of claim 10 , wherein the lens is opaque to visible light and transparent to a band of infrared wavelengths.
13. The motion sensor assembly of claim 10 , wherein the lens is opaque to visible light and transparent to a band of infrared wavelengths from 5 microns to 15 microns.
14. The motion sensor assembly of claim 9 , wherein the processor is configured to count a number of state changes generated over a predetermined period of time and detect a movement event in response to the number of state changes exceeding a predetermined number.
15. The motion sensor assembly of claim 9 , wherein the cover plate aperture is sized and positioned to receive a switch of the electrical component when the cover plate at least partially covers the electrical box.
16. A motion sensor system, comprising:
a temperature sensor; and
motion sensor assemblies, each motion sensor assembly comprising:
a cover plate comprising a cover plate aperture that permits a portion of an electrical component in an electrical box to pass through the cover plate when the cover plate at least partially covers the electrical box; and
circuitry configured to detect candidate motion events and transmit the candidate motion events to an external control system, wherein:
the circuitry is configured to compare the motion events to a voltage window that specifies a range of amplitude sensitivities;
the circuitry is configured to adjust a voltage window based on a temperature sensed by the temperature sensor;
based on the range of amplitude sensitivities, the circuitry is configured to reject signal amplitudes of the motion events associated with motions of animals and accept signal amplitudes of the motion events associated with motions of persons; and
the external control system configured to select, from candidate motion events received from each motion sensor assembly, candidate motion events that are each associated with a same time interval, and detect, based on the selected candidate motion events, a valid motion event associated with the same time interval.
17. The motion sensor system of claim 16 , wherein:
a first motion sensor assembly of the motion sensor assemblies comprises an additional sensor; and
the circuitry of the first motion sensor assembly is configured to increase a frequency at which readings are obtained from the additional sensor in response detected movement.
18. The motion sensor system of claim 16 , wherein the circuitry of a first motion sensor assembly of the motion sensor assemblies is configured to transmit the candidate motion events by electromagnetically transmitting the candidate motion events across an air gap to wiring powering its associated electrical component.
19. The motion sensor system of claim 16 , wherein:
a first motion sensor assembly of the motion sensor assemblies comprises a spiral antenna around an outer periphery of its circuit board; and
the circuitry of the first motion sensor assembly is configured to transmit the candidate motion events via the spiral antenna.
20. The motion sensor system of claim 16 , wherein:
a first motion sensor assembly of the motion sensor assemblies comprises the temperature sensor; and
the circuitry of the first motion sensor assembly is configured to detect candidate motion events based on a temperature sensed by the temperature sensor.