Step #1: PrevNext
There are two ways to get the parts that you will need for this project. The easy way is to buy a kit from robots.allthingsgeek.com. The harder way is to scrounge the parts yourself and use a protoboard. The basic circiut is a PPM-to-PWM decoder. This is a standard RC controller circuit. To build it you will need a 4017 decade counter. You will also need to find some continuous-rotation servos, or you can modify some standard servos.
Step #2: PrevNext
Solder up the board. If you are using the kit this step is very simple. Just make sure you put the chips in the right way. If you are using a protoboard you will have to follow the schematic.
Step #5: PrevNext
There are a couple of different ways to control your robot. You can use voice commands, Google Chat, a web browser, or another Android device. Refer to the Cellbots website for more details. You can also do local control with a Wii controller which is our favorite for fighting. For this you must first install the WiimoteController from the market. We made a fighting game with parts from the dollar store. The object is to pull the gold-colored shield off the front of the other robot using a magnet wand. We also added dart guns from the dollar store for extra firepower.