Rotellino - Battery Free Contactless Bike Light
thingiverse
Rotellino is a low-cost DIY bicycle light that's easy to build without batteries. This ingenious device harnesses electricity almost frictionlessly by utilizing the variation in magnetic field generated by the wheel rim, known as an Eddy current, to drive a rotor with 6 neodymium magnets and produce the current needed to power 2 LEDs. For more details, visit https://www.instructables.com/id/Rotellino-3-Battery-Free-Contactless-Bike-Light/.
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