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Laser Trip Wire
Posted March 12, 2015 by Chris
"In short, while the laser hits the photo-resistor, the LED is off. Once the laser is blocked, the LED will turn on. –The LED can be replaced with pretty much any additional electronics such as: motor control, solinoids, igniters, alarms, appliances, lighting, cameras or even interface with a computer to further expand possibilities with creative programming."
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