USB Bike Generator Charges USB Devices with the Power of Your Pedals


Instructables user dbc1218 explains his motivation:

The USB Bike Generator is a small bike mounted electricity producing device optimized to provide power for two USB ports. There are so many small electronics that can be powered or charged from a USB connection it only makes since [sic] that people might want to do this while riding a bike.

In a nutshell, the author hooks up a USB car adapter to a stepper motor, flexes some soldering muscles, and ends up with a pretty cool summer project. We've featured something similar before, but this one seems easier to accomplish and is a bit more polished.