For christmas I got a couple of robot parts. This robot consists of two continuous rotation servos, a small caster, an arduino uno and a 7.2 nimh battery. I attached the the wheel to the continuous rotation servo with a screw. I then did the same thing to the opposite wheel. I attached both continuous rotation servo to the piece of wood with hot glue.
I then attached all of the servo wires and the 7.2 nimh battery to a mini bread board. I combined all of the grounds together and then attached the wire to gnd on the arduino. I did the same with the 5 volts. I then attached the signal wires to digital pins 9,10, and 11. I then marked off two holes for the mini caster wheel. When I get some time, I will add either an ultrasound sensor or a sharp ir sensor to a mini servo. As of right now it only spins in circles, oblivious to its environment.