Using some fairly simple tech, you can build your own 'Laser Tripwire Alarm' - when the beam is broken, you will be alerted.
Step-by-step instructions and video via Instructables:
www.instructables.com/id/Laser-Tripwire-Alarm/?ALLSTEPS
Using some fairly simple tech, you can build your own 'Laser Tripwire Alarm' - when the beam is broken, you will be alerted.
Step-by-step instructions and video via Instructables:
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