Intelligent wall switch
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United States of America Patent
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-
Dec 17, 1996
Issued Date -
N/A
app pub date -
Sep 22, 1994
filing date -
Jun 16, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An intelligent wall switch incorporates a passive infrared sensor and a pressure pulse-wave sensor. A microcontroller monitors the sensor signals generated by the infrared sensor and the pressure pulse-wave sensor and calculates a weighted sum of the signals generated by the sensors. If the weighted sum calculated by the microcontroller exceeds a preset threshold the intelligent wall switch generates a signal indicative of human presence.
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