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How to build Light/Dark Detector

2014-12-15 05:47  
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This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light.

Circuit diagram

Light/Dark Detector-Circuit diagram


R1 100K PotQ1 2N3904 NPN Transistor or 2N2222Q2 NPN PhototransistorRELAY 9V RelayMISC Board, Wire, 9V Battery Snap (if battery used), Knob For R1


R1 Adjusts sensitivity

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