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Interfacing KY-008 Laser Transmitter Module with Arduino - Electropeak
How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler
KY-008 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino - AliExpress