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laser alarm
![Project 19: Laser Trip Wire Alarm - Arduino Project Handbook [Book]](https://www.oreilly.com/api/v2/epubs/9781457198861/files/images/f0164-01.jpg "Project 19: Laser Trip Wire Alarm - Arduino Project Handbook [Book]")
Project 19: Laser Trip Wire Alarm - Arduino Project Handbook [Book]
Little Laser Trip Wire Circuit
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Laser Tripwire Alarm : 9 Steps (with Pictures) - Instructables
Little Laser Trip Wire Circuit
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Laser Tripwire Alarm : 9 Steps (with Pictures) - Instructables
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![Project 19: Laser Trip Wire Alarm - Arduino Project Handbook [Book]](https://www.oreilly.com/api/v2/epubs/9781457198861/files/images/f0163-01.jpg "Project 19: Laser Trip Wire Alarm - Arduino Project Handbook [Book]")