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 right combination. Although this might not be the security system you want to put in place for your home, this definitely looks like a fun weekend project.
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‘Secret Knock’ Door Lock defends home from rhythmically-impaired perps (video)