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.
Matt showed off the proof-of-concept build this morning at Bike Hugger’s Built: Make & Tell event.
Right now, the setup is battery-powered, and is limited to one hour’s use. Matt’s already making plans for dynamo power in a later build. Check Matt’s Flickr set, linked below, for more pics of the system in action.