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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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KY-008 3pin 650nm Red Laser Transmitter Dot Diode Copper Head Module for arduino DIY Kit - ASK Electronics
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5Pcs Laser Receiver Non-modulator Tube Sensor Module Geekcreit for Arduino - products that work with official Arduino boards
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