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(3) Drive Robot to Move
Through the above circuit diagram, the direction pin of A motor is
D12, and speed pin is D3; D13 is the direction pin of B motor, D11 is
speed pin.
We know how to control digital ports according to the following
chart.
PWM decides 2 motors to turn so as to drive robot car. The PWM
value is in the range of 0-255, the larger the number, the faster the
motor rotates
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