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Power · Weekend · Advanced

Bicycle Pedal Generator

Convert an old bike and a DC motor into a human-powered charger for when the sun doesn't shine.

This is for educational purposes only. Not professional medical, electrical, or safety advice.

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  1. 01

    Mount the bike

    Clamp the rear wheel in a trainer stand so it spins freely.

  2. 02

    Couple the motor

    Press the motor shaft against the tire (friction drive) or use a belt from the wheel rim to a pulley.

  3. 03

    Block back-flow

    Add a diode so the battery cannot spin the motor backwards.

  4. 04

    Regulate

    Run output through a charge controller to the battery—never directly.

  5. 05

    Expect realistic output

    A fit adult produces 75–100W. One hour of pedaling ≈ charging phones and radios for days.