Keyestudio Ks0428 Manual page 92

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When the motor speed is constant, the potentiometer is driven to
rotate through the cascade reduction gear, which leads that the
voltage difference is 0, and the motor stops rotating. Generally, the
angle range of servo rotation is 0° --180 °
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 the rotation angle from 0° to
180°. But note that for different brand motor, the same signal may
have different rotation angle.
In general, servo has three line in brown, red and orange. Brown
wire is grounded, red one is positive pole line and orange one is
signal line.
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