What is a servo motor?
Servo is a device with an output shaft that can be moved to specific angular positions by sending a simple coded signal. As long as the coded signal exists on the input line, the servo will keep the angular position of the shaft. As the coded signal changes, the angular position of the shaft changes. Among other, servos are used in such as in radio control airplanes to control the position of wing flaps, in RC cars (to turn the wheels), puppets, and of course, in robots. A servo motor is a combination of a DC motor (a common small and powerful motor), a shaft position sensor, and a feedback circuit. The sensor allows the control circuitry to monitor the angle of the servo motor. If the shaft is at the correct angle, then the motor shuts off. If the sensor finds that the angle is incorrect, it will turn the motor until the angle is correct. A normal servo is mechanically incapable of turning further than 180 degrees. The angle is determined by the pulse duration that is applied every 20
