Secret Knock Detector

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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!

Process(or) Engineering

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computer repair,g rated,Hall of Fame,macro,neat,not a kludge,there I fixed it,wtf
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I have absolutely no idea what process engineering is. But from now on whenever hear that word I'm going to think of this. And so should you.

~NSHA

Side-by-Side Bike

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bicycle,bike,not a kludge,weld
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Also known at the Sociable, the side-by-side tandem bike has actually been around since the 19th century. Commonly used for courting couples or newlyweds, the bicycle is seeing a resurgence with hackers and DIY enthusiasts. One guide by Instructables user carlitos is a simple weld job consisting of nothing more than an extra seat, pedals, crank and some tubing. I can't think of a more perfect wedding gift.

Download the new Cheezburger app for a chance to win a PS4! in Cheezburger 's Hangs on LockerDome