reflected infrared light switch


Posted on Feb 6, 2014

Infrared light reflected off a finger is used to activate this switch circuit. Drawing only 30uA from a 3v supply, this circuit will detect a human finger with a range of about 1 inch. The sensor uses an inexpensive infrared LED and a matching photo diode.


reflected infrared light switch
Click here to download the full size of the above Circuit.




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