locked up

bad puns door dual use locked up - 4982527488
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Deadbolt always thought there was something strange about his brother. But they were never really open with each other.

~NSHA

dual use locked up overkill security - 4886471168
By Kristi
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Let me just unlock the gate, I'll be there in 2 hours after I figure out which key goes where. ~NSHA

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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!