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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


Motion Detectors
Shadow Activate Motion Detector 
This circuit can sound an alarm when the shadow of a hand or arm moves over  two small photo diodes.

Click on Drawing Below to view PDF version of Schematic

Shadow Activated Motion Detector designed by Dave Johnson, P.E. (Oct 24, 2005)

Motion Detectors

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

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