My experimental rover that I built from a Roll-A-Way alarm clock that was on clearance for $5.
It can be controlled via the numeric section of a keyboard when the serial port is connected to a computer or
a Wii Nunchuck attached directly to it, using either the joystick portion, or the accelerometer while pressing the bigger button.
It uses one of my customized Ardweeny and an H bridge L293D motor driver chip:
Here is a preview video:
I hope you like this just as much as I did, I learned a couple of things along the way. I built this at the same time while working on two different robots and rovers, however this one was simpler in hardware requirement and the code, and I can see a lot of potential for learning off it and expanding from it. Also if you find it too tight to put all the components inside you can always just use the code and the hardware on a bigger customized frame.
Please let me know if something is not clear or you need more details.
Included is my code: Roll_A_Way_Rover_v1_1.pde