Picture of Friction Lighted Car

In this instructable, I take a radio controlled car and convert it to a friction powered illuminated car--with ultracapacitor energy storage. You pull the car along the floor and the led on top comes on.  The one farad (not microfarad) capacitor (under $4.00) keeps the light on for half an hour or more.
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Step 1:

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Start with a radio controlled car--one where the wheels stay engaged with the motor.  Some of the cheapest cars have a slip arrangement in the gearbox for changing direction.  We need a vehicle which is either tank like (left side on or right side on) or one with geared drive wheels and proportional steering. I've suggested one from that works.

Step 2:

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Remove the cover and the lid to the battery container.

Step 3:

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Remove the springs from the battery container.

Step 4:

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Separate the car by removing screws so that you can access the motors.

Step 5:

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Notice that two wires go to each motor assembly from the electronic unit (green, yellow and red, blue).

Step 6:

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Cut the motor wires from the electronic assemly (radio receiver) and save the receiver for a future project.

Step 7:

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Drill 1/8 inch holes in the battery compartment and clip out one of the battery separation walls.

Step 8:

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Bring the motor wires through the holes and refasten the housing to the wheel assembly.

Step 9:

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Create a diode bridge (see schematic in step number one).  This allows voltage generated by the motor assembly (dc motors act like generators when turned) to always come out in a predictable fashion, regardless of which way the motor (now generator) is turned.  I use a diode bridge for each motor assembly so that they will feed the capacitor and led rather than each other.

Step 10:

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Solder the motor leads to the input of the diode bridge (the place where head and tail of diodes meet).

Step 11:

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Insert two pieces of double sided foam tape to the ultracapacitor.

Step 12:

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Stick the ultracapacitor into the battery compartment and bring positive and negative leads from the diode bridges to the capacitor.
very nice man! good job on this instructable.
I like this idea, and it's a neat way to give this toy a new life.