Laser tripwire with Alarm

Ruijc writes:

This was a project made as a request.

The idea was to build a circuit that was capable of simulating a tripwire trap. This type of of trap uses a wire placed 20 centimeters above the floor strapped to some bars or trees. When the intruder enters the protected area he trips on the wire and activates the alarm.

Laser tripwire with Alarm – [Link]

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