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Amazon.com: DAOKI 4PCS Laser Sensor Module Non-Modulator Tube Laser Receiver Module for Arduino with 4PCS KY-008 650nm Laser Transmitter Module, Dupont Cable : Industrial & Scientific
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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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