HOW TO – Build an ultrasonic burglar alarm

Technology

By Phillip Torrone

Phillip Torrone

current: @adafruit - previous: MAKE, popular science, hackaday, engadget, fallon, braincraft ... howtoons, 2600...

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@adafruit

August 11th, 2006

Here’s how to build an ultrasonic burglar alarm from “Popular Electronics April 1966” cross the line, the relay opens and an alarm or counter goes off – Link.

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Tagged DIY Projects

By Phillip Torrone

Phillip Torrone

current: @adafruit - previous: MAKE, popular science, hackaday, engadget, fallon, braincraft ... howtoons, 2600...

View more articles by Phillip Torrone

@adafruit

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