Using easily accessible parts, it is possible to build your own bicycle generator that will charge your cell phone! This instructable is an extension of this instructable made by our friends. Eventually, this bike will stand on its own in our student union, so our classmates can sustainably charge their phones off the grid!
The basic setup of the bike is as follows: the back wheel of the bike spins a DC motor via fan belt, the motor is connected to a charge controller, the charge controller charges a lead-acid battery, and the battery is then connected to an inverter. You can then plug your phone into the outlets of the inverter!
Basic Materials needed:
Bicycle Frame with Back Wheel
Wires, Screws, Wood, and a Metal Rod
NOTE: We added more to our bike to make it run better, but these are the bare minimum materials to get it up and running.
Step 1: Assembling the Bike
We attached our bike system to a 2' by 6' piece of plywood. We used a bike stand to suspend and stabilize the back wheel. You can bolt the back wheel stand to the board, but we thought it was unnecessary since other portions of the bike were attached to the board. Our bike was donated with the front wheel off, so we built a front wheel stand. Make sure you have enough room on the board to attach the motor behind the back wheel!
Building the front wheel stand: The forks had a 1 cm diameter hole, so we found a one inch dowel for it to rest on. In addition, we took a 1.5" x 3" wooden beam and cut it into two 9.5" and two 4.5" blocks. We drilled a 1cm hole 1/2" down from the top of each of the 9" blocks. We then put the metal rod through the blocks and assembled the stand (see photo above). We added some washers and nuts to make the connections more secure. The two 4.5" blocks should be cut to fit tightly between the 9" blocks, as shown above. After building the bike stand, the front wheel should sit snugly on the blocks. Next, we screwed the lower 4.5" block down to the plywood. Finally, we attached the upper 4.5" block for stability. Now the bike stand for the front wheel is complete and should sit snugly on the rod between the blocks.