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Build a Simple Laser Tripwire Alarm | Make:

Laser Tripwire Alarm : 9 Steps (with Pictures) - Instructables

Laser Tripwire Home Alarm System : 5 Steps (with Pictures) - Instructables

Laser Diode Tripwire Alarm… A Launchpad Security System - LEKULE BLOG

Laser Tripwire Home Alarm System : 5 Steps (with Pictures) - Instructables

Laser Tripwire Home Alarm System - Electronics 360
![How to make a Laser Tripwire Alarm Circuit on a Breadboard [HD] - YouTube](https://i.ytimg.com/vi/ZIwBVln4cgQ/maxresdefault.jpg)
How to make a Laser Tripwire Alarm Circuit on a Breadboard [HD] - YouTube