Reducing movement-associated false positives in motion detection
Motion detectors can include a housing defining a first cavity and an aperture extending through the housing. A circuit board can be disposed in the first cavity. An infrared sensor and a light sensor can be mounted on the circuit board. A lens can extend across the aperture. A wall can extend between the lens and the circuit board such that the wall, the lens, and the circuit board define a second cavity at least partially within the first cavity and the second cavity contains the infrared sensor and the light sensor.
1. A method, comprising:
acquiring, by a computing system, a first plurality of samples of a first signal generated by an infrared sensor over a first time interval;
determining, by the computing system and based at least in part on the first plurality of samples, a first average power of the first signal over the first time interval;
determining, by the computing system, that the first average power exceeds a first threshold; and
based at least in part on the first average power exceeding the first threshold, outputting, by the computing system, an indication of motion.
2. The method of claim 1 , further comprising:
performing a root-mean-square (RMS) calculation using the first plurality of samples to determine the first average power.
3. The method of claim 1 , further comprising:
receiving, by the computing system, an input representing a changed sensitivity setting; and
adjusting, by the computing system, a duration of the first time interval based at least in part on the changed sensitivity setting.
4. The method of claim 1 , further comprising:
receiving, by the computing system, an input representing a changed sensitivity setting; and
adjusting, by the computing system, the first threshold based at least in part on the changed sensitivity setting.
5. The method of claim 1 , further comprising:
acquiring, by the computing system, a second plurality of samples of a second signal generated by a light sensor over a second time interval;
determining, by the computing system and based at least in part on the second plurality of samples, a second average power of the second signal over the second time interval;
determining, by the computing system, that the second average power exceeds a second threshold; and
based at least in part on the second average power exceeding the second threshold, increasing, by the computing system, the first threshold by a first value.
6. The method of claim 5 , further comprising:
receiving, by the computing system, an input representing a changed sensitivity setting; and
adjusting, by the computing system, the first value based at least in part on the changed sensitivity setting.
7. The method of claim 5 , further comprising:
receiving, by the computing system, an input representing a changed sensitivity setting; and
adjusting, by the computing system, a duration of the second time interval based at least in part on the changed sensitivity setting.
8. The method of claim 5 , further comprising:
receiving, by the computing system, an input representing a changed sensitivity setting; and
adjusting, by the computing system, the second threshold based at least in part on the changed sensitivity setting.
9. The method of claim 1 , further comprising:
acquiring, by the computing system, a second plurality of samples of a second signal generated by another infrared sensor over a second time interval;
determining, by the computing system and based at least in part on the second plurality of samples, a second average power of the second signal over the second time interval; and
determining, by the computing system, that the second average power exceeds a second threshold;
wherein outputting the indication of motion is further based at least in part on the second average power exceeding the second threshold.
10. The method of claim 9 , wherein the first threshold and the second threshold are a same value.
11. The method of claim 9 , wherein the infrared sensor receives infrared radiation from a first portion of individual zones and the another infrared sensor receives infrared radiation form a second portion of the individual zones, the second portion being different than the first portion.
12. The method of claim 4 , wherein:
receiving the input comprises receiving, by an RF receiver, an RF signal encoded to represent the changed sensitivity setting; and
the method further comprises decoding, by the computing system, the RF signal to determine a modified value of the first threshold.
13. The method of claim 1 , wherein outputting the indication of motion comprises:
using a radio frequency (RF) transmitter to send, to a base station, an RF signal including a flag indicative of the motion.
14. A system, comprising:
an infrared sensor configured to generate a first signal;
at least one processor; and
at least one non-transitory computer-readable medium encoded with instructions which, when executed by the at least one processor, cause the system to:
acquire a first plurality of samples of the first signal over a first time interval;
determine, based at least in part on the first plurality of samples, a first average power of the first signal over the first time interval;
determine that the first average power exceeds a first threshold; and
based at least in part on the first average power exceeding the first threshold, output an indication of motion.
15. The system of claim 14 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
perform a root-mean-square (RMS) calculation using the first plurality of samples to determine the first average power.
16. The system of claim 14 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
receive an input representing a changed sensitivity setting; and
adjust a duration of the first time interval based at least in part on the changed sensitivity setting.
17. The system of claim 14 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
receive an input representing a changed sensitivity setting; and
adjust the first threshold based at least in part on the changed sensitivity setting.
18. The system of claim 17 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
receive the input at least in part by using a radio frequency (RF) receiver to receive an RF signal encoded to represent the changed sensitivity setting; and
decode the RF signal to determine a modified value of the first threshold.
19. The system of claim 14 , wherein the system further comprises a light sensor configured to generate a second signal, and the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
acquire a second plurality of samples of the second signal over a second time interval;
determine, based at least in part on the second plurality of samples, a second average power of the second signal over the second time interval;
determine that the second average power exceeds a second threshold; and
based at least in part on the second average power exceeding the second threshold, increase the first threshold by a first value.
20. The system of claim 19 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
receive an input representing a changed sensitivity setting; and
adjust the first value based at least in part on the changed sensitivity setting.
21. The system of claim 19 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
receive an input representing a changed sensitivity setting; and
adjust a duration of the second time interval based at least in part on the changed sensitivity setting.
22. The system of claim 19 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
receive an input representing a changed sensitivity setting; and
adjust the second threshold based at least in part on the changed sensitivity setting.
23. The system of claim 14 , wherein the system further comprises another infrared sensor configured to generate a second signal, and the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
acquire a second plurality of samples of the second signal over a second time interval;
determine, based at least in part on the second plurality of samples, a second average power of the second signal over the second time interval;
determine that the second average power exceeds a second threshold; and
output the indication of motion further based at least in part on the second average power exceeding the second threshold.
24. The system of claim 23 , wherein the first threshold and the second threshold are a same value.
25. The system of claim 23 , wherein the infrared sensor is configured and arranged to receive infrared radiation from a first portion of individual zones and the another infrared sensor is configured and arranged to receive infrared radiation from a second portion of the individual zones, the second portion being different than the first portion.
26. The system of claim 14 , wherein the at least one non-transitory computer-readable medium is further encoded with additional instructions which, when executed by the at least one processor, further cause the system to:
output the indication of motion at least in part by using a radio frequency (RF) transmitter to send, to a base station, an RF signal including a flag indicative of the motion.