clever

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Steve Hoefer at Grathio labs shows off his Arduino based door opener, which responds to knocks on the door bye timing the gaps between the sounds. If the gap matches the programmed knock, it unlocks. Let's never use keys again!

Know a little bit about Arduino and care to make your own? Check out his Instructables post!

clever dual use july 4 yard work - 4911996160
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Okay, the true American is to pay someone else to do it. But this is a close second. Happy 4th! ~NSHA

clever not a kludge tape - 5072322560
Via Reddit
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I just need to get one of these printed with TIFI logo and I'll be good to go!

~NSHA