Project 9: Servo
(1)Description：
Servo motor is a position control rotary actuator. It mainly consists of
housing, circuit board, core-less motor, gear and position sensor. Its
working principle is that the servo receives the signal sent by MCU or
receiver, and produces a reference signal with a period of 20ms and width
of 1.5ms, then compares the acquired DC bias voltage to the voltage of the
potentiometer and obtains the voltage difference output.
For the servo used in this project, the brown wire is
the ground, the red one is the positive wire, and the
orange one is the signal wire.
The rotation angle of servo motor is controlled by regulating the duty cycle
of PWM (Pulse-Width Modulation) signal. The standard cycle of PWM
signal is 20ms (50Hz). Theoretically, the width is distributed
between 1ms-2ms, but in fact, it's between 0.5ms-2.5ms. The width
corresponds to the rotation angle from 0° to 180°. But note that for
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