Position Feedback Servo (2026)

• Servo might use inexpensive parts with a large tolerance, leading to inaccurate shaft positioning.

• If we turn off the Microcontroller connected to the servo, then on power-up, it won't be able to tell the current position of the servo shaft.

• Any external force applied to the servo shaft during its operation can cause the shaft position to change. This change cannot be noticed by the Microcontroller. Advantages of Analog Feedback Servo:

 Advantages of Analog Feedback Servo 

• This servo is capable of providing a closed feedback loop between the microcontroller and Servo which helps to maintain the accuracy of the servo shaft.

• Each position of the servo shaft between 0-180 degrees can be represented as a unique Analog voltage. This Analog voltage can be read by Microcontroller having Analog pin.

• Any external force applied on shaft is reflected as a change in the analog value. Enabling you to know the deflection of the servo shaft in real time!

• Connect the separate 4th wire of the servo to the Analog pin on the Microcontroller and the rest of the wires as per standard connection.

• Open a SWEEP sketch provided in ArduinoIDE under the servo section to swing the shaft between two extreme positions (0-180 degrees).

• Modify the above code to read the Analog value and display it on the serial monitor for both extreme positions.

• Map these recorded Analog values against 0 to 180 degrees using the MAP function. You now have the Servo capable of providing position feedback.
  

• You no longer need to save the current position of the servo shaft in the EEPROM every time you move your shaft.

• You can monitor the analog value to see the deflection of the shaft by any external force to take corrective action.

• Train your servo manually with your hand to rotate the shaft at the desired angle. Powerful, isn't it!