Pen Car

It basically is a wooden car tired two motors, also with a photo resistor on it. There is a pen under the car, when the car start to run, the pen start to draw. The car run as a circle, when you use lamp to give lights on the car, car will close to the center( I use the h-bridge to control the direction).  Since it consumes a lot of power, when I took pictures, it runs out of power…anyway, it looks beautiful.