Variable sensitivity motion detector

Details Variable sensitivity motion detector Variable sensitivity motion detector

G - Physics

08

B

340/148, 315/26

G08B 13/18 (2006.01) G08B 13/181 (2006.01)

Patent

CA 1276261

A B S T R A C T The motion detector of the present invention, together with associated AC switching circuitry form a lighting control system which turns on room lights when the room is occupied, and extinguishes the lights when unoccupied. The detector sensitivity or threshold is adjusted in response to the previously detected conditions, providing reliable indication of both entry and continued presence in the controlled area, and producing few false alarms. The present embodiment of the invention has two threshold levels of detection, the higher level being used to detect initial entry into the room. After entry is detected, the motion detector lowers the threshold to detect the weaker signals usually occurring for continued presence in the area of the detector. When the occupant leaves the area, the motion detector threshold or sensitivity returns to the original value after a timeout period.

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