Batteryless light with magnetic Induction for bikes.

this is the relay I’ve hacked to get the coil inside.

I’ve used the very simple circuit below. It does the job. If you search the net for “induction bike light” you can find many other circuits with more functions such as an additional standby light powered with a small capacitor etc.

The circuit schematic. I’ve used a forward facing blue led and a rear facing red led in the same unit.

assembly photos

STL files are at the following pages

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