'Secret Knock' Door Lock defends home from rhythmically-impaired...

Courtesy Engadget  Wed, 11/04/2009 - 19:14

The Arduino board has been the engine of many wild and wacky projects over the years, from bakery tweeting to various musical instruments .

For its next trick, our man Steve Hoefer has taken his microcontroller and, along with a piezoelectric speaker, a gear reduction motor, and some PVC pipe, programmed it to listen for a preset sequence of knocks -- a secret knock, if you will -- and unlock the deadbolt upon hearing the...

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