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Over on DinoFab, Dean shows off his latest bike improvement, an LED light system that uses a generator built from an old printer stepper motor. He points readers to this article about how to generate electricity using steppers.

Stepper Motor Powered Bike Light

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.



  1. Big Daddy Dave says:

    I love it. I’ve always wanted an easy to make genie, and I’ve got plenty of busted printers laying about.

  2. Anool says:

    I guess adding a capacitor across the LED’s to act as charge storage, would provide some additional power during bike stoppages.

  3. Maker Dino says:

    If you add some diodes to rectify the AC voltage output from the stepper to DC voltage, it gets easier to work with for charging batteries and caps. Just connect a small diode inline on each coil wire, then join all the outputs from the diodes. This is the positive side of the DC and the common wire from the stepper is the negative side.

  4. ejolson says:

    “this article” in the paragraph is a broken link.

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