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Ultrasonic tripwire alarm using Arduino
![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]
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