A servo motor controller is a circuit that is used to control the position of a servo motor. It is also called as a servo motor driver. A servo motor controller consists of a controller, the servo motor and the power supply unit.
The duration of pulse varies from about 0.5 ms for 0 degree rotation to 2.2 ms for 180 degree rotation. The pulses need to be given at frequencies of about 50Hz to 60Hz.