Servos can be controlled by sending an electrical pulse, or by pulse width modulation through the control wire. A servo motor can turn only 90° in either direction for a total of 180° movement. The motor’s neutral position is the position where the servo has the same amount of potential rotation in the both direction( clockwise or counter-clockwise). The PWM sent to the motor measures the position of the shaft, and based on the duration of the pulse the rotor will turn to the desired position.
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