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1PCS KY-008 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for arduino DIY Kit
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KY-008 Laser Transmitter +Laser Receiver Sensor Module Non-modulator Tube Laser Sensor Module For Arduino AVR - AliExpress
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Acxico 2Sets Laser Sensor Module For Arduino AVR(KY-008 Laser Transmitter +Laser Receiver Sensor Module Non-modulator Tube) : Electronics - Amazon.com
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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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