JavaScript Robotics: Laser Trip Wire with Johnny-Five
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DIY Portable Laser Tripwire! - YouTube
Little Laser Trip Wire Circuit
Amazon.com: SpyX / Lazer Trap Alarm – Safe Laser Alarm Toy for Spy Kids to Protect Stuffs. Invisible Infrared Beam Spy Gadget for Kids. Motion Sensor / Detector Toy for Boys &
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Green Laser Line Trip Wire Illuminator & Detector for EOD