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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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5Pcs KY-008 Laser Transmitter Module AVR PIC Geekcreit for Arduino - products that work with official Arduino boards
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650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head Compatible With Arduino by Atomic Market - Newegg.com
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