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Originally Posted by Hadi379
We are having the same problem as the OP...everything works except the rotation. when we try to rotate the robot, the back wheels spin forward and the front wheels spin backwards. any ideas?
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That would happen if you had the controls swapped between two diagonally opposite motors. For example, you could be controlling the left front motor with the right rear PWM signal, and vice versa. Make sure the wires match the programming.