For a pet project of mine, I like to generate power from a rotational motion. (similar to bicycle tire turn). I want to build the system without a battery where as the tire turns I generate enough electricity to turn an LED. It is ok if the LED is dim in slower speeds, my application will only cover the high speed cases.
What is the best approach to this?
I do not want a magnetic coupled system, this should be one piece.
update The device is for bicycle, it is an active reflector. I wanted to use the rotation of the bicycle and light an led from the generated energy. T I didn't want a two point solution where I put a magnet somewhere and use that to generate energy. Just use the rotational motion. Some piezo material that would accumulate energy and use to pulse a led for a few msec every second.