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Young Maker Profile: Andrew Katz
Andrew combined ultrasonic sensors, an Arduino microcontroller, and his laptop to create his Notify Me Now stealth home security system that alerts him that alerts him whenever a sensor is tripped.
In Maker from MAKE: schoolsout: School's Out page 94

Notify Me Now!
One young maker's home security system.
From MAKE: 30: Smarter Homes page 59