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After much more research the real answer I believe is here:
http://www.patentstorm.us/patents/4703171/fulltext.html
I have found that William Kahl invented the infrared motion sensor for burglar alarms first and then he sent in an application for the infrared light switch motion sensor in 1985. There had been other motion sensor light switches but this specific infrared motion sensor (PIR) is the one that is most used today residentially and in companies as well.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoRussian musician and inventor Leon Theremin invented the motion sensor in the 1920s. Theremin used his knowledge of the body's electrical charge to create his device, which he termed the "Radio Watchman."
William Kahl invented the infrared motion sensorfor burglar alarms first and then he sent in an application for the infrared light switch motion sensor in 1985.
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