Oct 28, 2010
Remember those movies where you had to know a secret knock to open up a passageway? Now you can make your own! You can do some amazing things with Arduino. Steve Hoefer of http://projects.grathio.com/ has designed a simple but amazing secret knock door lock using only some PVC pipe, a servo, a microphone, a few LEDs, and an Arduino board! Check out this amazing...


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