[Generating energy]
DC motor: Voltage 24 volts. Power 250 watts. Rated speed 2750 rpm. Rated current 13.5a

In order to have the wheel-roller spinning as evenly as possible, we ran a positive current through the motor, using it as a lathe.

We then measured the voltage we could produce without any load. Bicycling lazily, Jay could produce 15 volts.

[Powering the Raspberry Pi]

We bought a 12 volts rechargeable battery that will eventually be recharged by the bike-powered DC motor. Here are the battery specifications:

Battery: enercell sealed lead-acid. 12 VC. 7.ah. Normal charge 14.4-15 OV. Stand by 13.5-13.8 V.

We built a circuit that could regulate the voltage down to 5 V using the following:

Battery -> 100uF -> 7805 regulator -> 100uF -> 1uF -> Raspberry Pi

WE used this circuit to power the Raspberry Pi

Raspberry Pi draws .500a to .700a to boot.

It took Cycling for 1:52 to fully charge three 2.5VDC Capacitors in Parallel.