Servo Motor

What is the Servo Motor?

Servo motor is an electrical device that can be used to rotate the objects (like a robotic arm) precisely.

It’s a rotary actuator or the linear actuator which allows precise control of angular or linear position, velocity, and acceleration.

Servo implies an error sensing feedback control which is utilized to correct the performance of a system.

Read:- Interfacing Servo with Arduino.

It is actually an assembly of four things: a normal DC motor, a gear reduction unit, a position-sensing device, and a control circuit.

The DC motor is connected with gear mechanism which provides feedback to the position sensor which is mostly a potentiometer. From the gearbox, the output of the motor is delivered by servo spline to the servo arm.

For standard motors, the gears are normally made up of plastic whereas for high power servos the gears are made up of metal.

Servo motor has a rotation angle that varies from 0° to 180°.

servo motor

Servo Motor Pinout

+VCC (Red)Connect +VCC supply to this pin. For 9g Micro Servo it is 4.8 V (~5V).
Ground (Brown)Connect Ground to this pin.
Control Signal (Orange)Connect PWM of the 20ms (50 Hz) period to this pin.


  • Required Power: 4.8V – 6V DC max (5V works well)
  • Average Speed: 60 degrees in 0.20 sec (@ 4.8V), 60 degrees in 0.16 sec (@ 6.0V)
  • Weight: 62.41 gm
  • Size mm: 40.7 x 19.7 x 42.9
  • Spline Count: 25

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