This is a pretty simple project that will give you back-up power in the palms of your hands! Shared by Techgenie on Instructables:
We all know that when the electrical power is supplied to a motor, it rotates mechanically but when the shaft is rotated mechanically, the motor generates electrical power. So, in this Instructable, we will work on a small project that will utilise this above said principle on a geared DC motor to work as a electricity generator for making a hand powered 5v USB Charger for mobile phones. This device can also be used as a 5v DC power supply for various projects.
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.