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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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Laser Transmitter 5mw 650nm Red Dot Laser Diode Module For Arduino Laser Head Sensor Module Ky-008 - Replacement Parts - AliExpress
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KIRO&SEEU 5pcs KY-008 Laser Transmitter 5V Laser Dot Diode Sensor Module Board for Arduino: Amazon.com: Industrial & Scientific
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KY-008 650nm Laser Sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino: Amazon.com: Industrial & Scientific
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Lesson 72: Obstacle detection using Laser Transmitter and receiver | Arduino Step By Step Course - YouTube
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