KY-008 Laser Module x Laser Detector x ISD1820 Voice Recording Module
We've just found a great module that can give you more possibilities and this is Laser Detector. It can detect laser with the transparent sensor and send high or low output to Arduino. Using with KY-008 Laser Module together you can make it as a switch and instruct Arduino turning on / off something...By: eLab Peers
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[original story: Instructables]