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Rcmall 10pcs 5v 650nm Laser Module With Demo Code,laser Receiver Module,5v Electromagnetic Active Buzzer For Arduino - Antenna - AliExpress
![How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler](http://www.mschoeffler.de/wp-content/uploads/2017/01/detector_laser_picture.jpg)
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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