Been playing with a store display of one of these reels:
Wondering how one would go about building the electronics for it. I assume you would need to generate power for the uC via induction, and then use the same coils/magnets to perform braking and store the power in a supercapacitor or similar.
Any ideas if this is feasible with a pico-power AVR? The control and sensing of the spool doesn't seem to be that difficult, just wondering if there would be enough power to run without a battery.