ITP student Danne Woo modified his longboard with strips of LED lights that illuminate when a wheel-mounted generator spins. In short, a stepper motor is run through a bridge rectifier followed by a one farad supercapacitor and then into the LEDs. The resulting project is suitably called “The Circuit Board.”
This self-contained unit gives the rider increased night-time visibility, but also looks wicked cool as it’s rolling down the street.
Note the thoughtful mounting of the stepper motor to the skateboard’s truck, and the spring-actuated tensioner that keeps the motor’s shaft mated snugly to the wheel. Also, a bit of Plasti Dip on the shaft keeps a suitable amount of friction to optimize power generation.
Danne has further documentation on his site. Maybe the next iteration can implement some rugged enclosures to protect the board from the elements and even utilize power to do something else. Perhaps to charge a cell phone?