I like the video of "real wall-e" very much, and very interested in make one.
I'v bought the u-command wall-e (it's pretty expensive). And have taken apart it.
I found the the wall-e only have one DC Motor connected with its left wheel, and right wheel is driven by left wheel through a special group of gears, which make right wheel always turns forward, no matter left wheel turns forward or backward. By this design, wall-e can only go forward and turn left, cannot not turn right or go backwards.
So I need to use another motor to control the right wheel solely. That means I have to modify the gears of right wheel. But all gears are sealed in one small plastic box and cannot be open.
Anyone have suggestions ?