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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!

air vent,cat,litter box,window
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I built this for my cats. There is a 120mm computer fan and a motion detector set to run the fan for 5-minutes when the cat enters the box. Kitties shouldn't have to take a #2 without fresh air, should they?

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