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i use portable usb powerbanks for most of my projects (usb heated clothing, smart plant pot). and i also bike a lot. so i decided to create a very cheap, "clip on" power source to charge these batteries. it can then be used to charge a smartphone, tablet basically anything that needs a usb plug to recharge.
the goal is to reach 5V-500mA to charge these batteries. our design is using a dc motor found inside of an old all-in-one paper printer. the biggest one in there.. you could easily add another motor in parallel to boost the current. at 1-2amps we are now able to charge all new smartphones and tablets directly from the handle bar. but remember, we can easily, with a single motor, still charge a powerbank which then can charge any electronic device you may have.
when you apply power to a dc motor it starts to spin. and if you spin the shaft manually either by pedaling, gravity, water, wind etc. then your motor starts giving out electricity from the wires. i can easily generate upto 10-13V constantly while biking. you can implement the same idea in a different scenario such as a wind powered generator.!!
- dc motor
- female usb port
- mini voltmeter (optional)
- frame (3D printed, DIY case)
let's get started..>