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How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler
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Huepar LR-5RG Laser Detector for Laser Level - Green and Red Beam Receiver for Use with Pulsing Line Lasers, Two-Sided Back-lit LCD Displays, Automatic Shut-Off Timer, Clamp Included - - Amazon.com
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