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Last Updated on: Friday, November 17, 2017 06:31 AM

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More  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

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


More   Motion Detectors

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