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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 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino - AliExpress
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4pcs KY—008 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino - - Amazon.com
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KY 008 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino| | - AliExpress
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