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DiscoverCircuits.com  --   Dave's Circuits
Circuits designed by David Johnson, P.E.

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Last Updated on:  06/17/2009 03:30:30 PM

Infrared Circuits

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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.

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

Infrared Circuits
Master Schematic Category List - David A. Johnson, P.E.
 
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