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More  Infrared Circuits

Reflected Infrared Light Switch


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.

Click on Drawing Below to view PDF version of Schematic

Circuit Finger Reflection Light Sensor Circuit designed by Dave Johnson, P.E. (June 30, 2006)

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