locked up

cars locked up padlock security - 4952212992
By -Ghost-
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I think the biggest kludge is the steering wheel on the other side. How does that happen???

~NSHA

car chain locked up padlock wheels - 4774789632
By Unknown
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Because car thieves never carry any sort of tools with them. ~Not-So-Handy Andy

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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!