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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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10PCS KY 008 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino|Integrated Circuits| - AliExpress
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1pcs Ky-008 650nm Laser Sensor Module 6mm 5v 5mw Red Laser Dot Diode Copper Head For Arduino Diy Kit - Sensors - AliExpress
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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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