This is a project that uses many recycled materials. We start by scraping a broken printer or scanner looking for a motor that can be used to generate energy. I made a back light with red LEDs but the same motor could power white LEDs for the front.
Please don't mind the fliptops with socks. This was made at the rural hacklab Nuvem - nuvem.tk
Step 1: The printer
Open the printer with a screwdriver and a hex nut driver, and basically dismantle the whole thing. You might need to break some of the plastic pieces. In any printer there are many useful parts for DIY such as axes, sprockets, chains.
Step 2: The motor
This is the kind of motor we're looking for. It's a stepper motor, used in printers because it allows fine control of the movement. You can recognize them easily as they have a connection for 4 to 6 wires. Sometime you'll find DC motors, which only have two wires. They can be used too, but the circuit is different.
Step 3: Some parts
I picked this motor because it had a long axe which would be very appropriate to hook up to the wheel. I also used these two small blocks of wood (7cm x 4cm x 2cm or roughly 3 in x 2 in x 1 in). They'll be used to fix the LEDs. I also got some telephone wire, 6 red LEDs and 3 220 ohm resistors.