As with any good robot base, we have the all important motor power switch and a handle!
Step 1: Materials
We also used the Caster Wheel Kit from Parallax (item #28971). We strongly prefer robots with two drive wheels and a caster over skid steering robots! In our experience, skid steering (4 powered wheel) robots have trouble turning on some rugs and patios.
For the motor controls, we used two of the Parallax HB-25 Motor Controllers. (item #29144)
For the Servo controller, we used the Parallax Servo Controller (USB). (item #28823)
For the rest, we used a 12"x10" piece of 1/2" plywood, 8" of 1x3 pine, and some screws and bolts. The main ones were 2.5" Flat Head 1/4"x20 bolts. The flat head bolts were used throughout to keep the surface of the robot flat.