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

Master Category List - Dave's Circuits
Last Updated on: Friday, July 18, 2008 11:34 AM


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

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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