How to Build a laser tripwire that can trigger anything out of a photoresistor « Hacks, Mods & Circuitry :: Gadget Hacks
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How To MacGyver A Laser Tripwire Using Arduino
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Entrapment' comes to life with this Arduino-compatible laser trip wire | Atmel | Bits & Pieces
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How to make a Laser Tripwire Alarm using Arduino. – MYTECTUTOR