A battery-less bicycle computer that gets power and data from the wheels: gadgets

I actually made and programmed one of them as an advanced project for the university. It uses accelerometers and sensors on the wheels to obtain wheel speed, inclination, and other data. It uses it to automatically change the gear ratio (it’s a csv, I think it’s nexus 7 or something). It has a more basic display, but I did include a switch and two buttons to override the “manual” mode and switch the servo with button control. The reading will show the speed and ratio.

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