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By Unknown
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It can follow light sources via adaptive motor orientation, which may not seem that impressive, but let me reiterate: 10 dollars.

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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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Hit something with a sledge hammer long enough and you can take down anything.