The Arduino powered Laser trip wire system project is currently over on the Kickstarter crowd funding website looking to raise $3,000 pledges to make the jump from concept to production.

Posted in Arduino Hacks, Laser Hacks, Security Hacks Tagged alarm, arduino, laser, security, tripwire ← Bench-top Laser Engraver Does Some Cutting Too Building Your Internet Radio Empire → ...

How to create a simple laser trip wire alarm, taken from theArduino Project Handbook: 25 Practical Projects to Get You Started.

[over9k] used his Arduino to set up a laser trip wire. The laser is mounted along side the Arduino, reflects off of a mirror, and shines on a photoresistor that interfaces via a voltage divider. Th… ...

It works in a home aquarium with toys, but could this laser tripwire alert people to hungry sharks approaching swimmers?