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Cool of the day: Make your own speed vest for biking. Instructions below. Will you make one or is this just silly??

Cyclist Speed Vest via MAKE

In the interests of safety on the roads, a lightweight vest for cyclists to display their speed:

This lightweight night-cycling vest displays your current speed in glowing, 7-inch-tall numbers easily visible to cars. On the back, an Arduino microcontroller reads input from an off-the-shelf bike speedometer sensor, and then switches power to sewn-in numerals made from electroluminescent (EL) wire.

Instructions how to make your own can be found here

(via prostheticknowledge)