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Thursday, March 21, 2013

“Heads Down” Display for Bicycles [MAKE]


So far the coolest thing I’ve seen at SXSW has been this clever early-stage prototype from our own Matt Richardson. It’s a “dynamic bike headlight” that projects your speed (and potentially other useful information) onto the road in front of you as you ride.
The prototype has a Raspberry Pi for a brain, which is connected through its onboard HDMI port to an LED pico projector mounted between the handlebars. A Hall effect sensor, connected to the Pi’s GPIO pins via an adafruit Pi T-Cobbler breakout kit, detects revolutions of the front wheel. The software counts these, converts their rate into a speed in MPH, and sends the numbers to the projector for display on the road surface.

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