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Ask HN: Cool Arduino projects

I'm looking to get into Arduino (or We-IO) and in need of inspiration.

What are some cool, small, DIY projects you saw, or wish to see utilizing the Arduino micro controller.

Thanks!

( 2 comments | 6 points | on HN )
Re:Ask HN: Cool Arduino projects by zphds on Monday March 16, 2015 @11:52AM (#9212133)
Shameless plug: http://sudharsh.me/blog/2013/12/07/jenkins-build-status-on-a...

Everyone out there seem to start out with a CI traffic light using Arduino. This is no exception :).

Re:Ask HN: Cool Arduino projects by poseid on Monday March 16, 2015 @08:36AM (#9211052)
there is a topic for this on reddit: http://www.reddit.com/r/ArduinoProjects