'Secret Knock' Lock defends home from rhythmically-impaired
SOURCE: DIGG • 2009-11-06
TOPICS:
Locksmithing • Locks • Embedded Systems • Deadbolt • Piezoelectricity • Microcontroller
[169 diggs @ Gadgets] 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 h...
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