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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!

By Unknown
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You can almost see the red shells swirling around him!

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If you don't want to turn the meat manually, use a tool you tool!

By Unknown
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It's also the only way to get air inside. Bullet-proof glass is intense.

~NSHA