HOWTO: DIY bike helmet LED nav to Citi Bike stations | Boing Boing - discu.eu

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HOWTO: DIY bike helmet LED nav to Citi Bike stations - Boing Boing http://boingboing.net/2013/06/19/howto-diy-bike-helmet-nav-to.html 9 comments 20/6/2013 bicycling