HPL (hand powered light)
thingiverse
https://youtu.be/P4YJBCraq5k This hand-powered light utilizes a low-cost geared DC motor sourced from AliExpress, which provides sufficient energy to power a 100 mA LED (white, 10mm). The fundamental circuit consists of a resistor and an LED, making it simple to generate light. Adding a 1000uF capacitor can help stabilize the light output. A diode is also essential in preventing backflow through the motor. Users may need to reverse the motor wires if the light doesn't shine when used with either hand. For added convenience, users can install a bridge rectifier to ensure the light functions consistently regardless of the rotation direction. The entire assembly fits snugly within a compact housing that closes securely with a lid. A rotating grip surrounds an M4 bolt, providing a comfortable grip.
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