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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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Amazon.com: HiLetgo 5pcs DC 5V Laser Transmitter Module Wave Length 650 nm for Arduino PIC AVR : Industrial & Scientific
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Rcmall 10pcs 5v 650nm Laser Module With Demo Code,laser Receiver Module,5v Electromagnetic Active Buzzer For Arduino - Antenna - AliExpress
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