Nuts and Volts - September 2013

40 September 2013

BUILD IT YOURSELF

BUILD THIS SIMPLE ALARM SYSTEM WITH THE

TI LAUNCHPAD

By Derek Tombrello Go to www.nutsvolts.com/index.php?/magazine/article/ september2013_Tombrello for any additional files and/or downloads associated with this article. You can also discuss this topic at http://forum.nutsvolts.com.

Years ago, I designed a very simple alarm system for my shop that was armed and disarmed with a barrel key. The only components (aside from the door sensors and the siren itself) were a relay, a transistor, and a key switch. While that worked great, I had originally intended to (eventually) add a keypad interface, but never got around to it. Now, with Texas Instruments' low cost ultra-low-power MSP430

microprocessor, there was no reason to put it off any longer!

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