a found an old rc truck at goodwill for $5, pulled the guts out of it (except for the motor and rear axle), and mounted the servo up front for steering (it had a small dc motor/gear system). I bought a motor driver with PWM from sparkfun, and mounted/wired everything up on a radio shack PCB. After finding out that a single 9v couldnt power all three compontents (arduino, servo, motor), I ended up putting all three on their own power source. the arduino and servo both have a 9v going into a 7805 5v regulator, and the motor has 8 AA's. It still needs some work and a little rewiring, but i played with it out in the driveway today and it works pretty well. Next step is to shrink the Nunchuck contoller from using my Uno to a breadboard arduino with a battery 9(or just scrapping the nunchuck altogether and going with a joystick control, but for now, the nunchuck is kind of fun).
