Arduino - Servo Motor controlled by Potentiometer

In a previous tutorial , We have learned how a potentiometer triggers a servo motor. In this tutorial, We are going to learn how to rotate a servo motor according to the potentiometer's output value

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Servo Motor
6×Jumper Wires
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About Servo Motor and Potentiometer

If you do not know about servo motor and potentiometer (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Servo Motor Potentiometer Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

How To Program

  • Reads the value of the potentiometer (value between 0 and 1023)
int analogValue = analogRead(A0);

  • Scales it to angle (value between 0 and 180)
int angle = map(analogValue, 0, 1023, 0, 180);

  • Sets the servo position according to the angle

Arduino Code

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #include <Servo.h> Servo myServo; // create servo object to control a servo void setup() { // initialize serial communication at 9600 bits per second: Serial.begin(9600); myServo.attach(9); // attaches the servo on pin 9 to the servo object } void loop() { // reads the value of the potentiometer (value between 0 and 1023) int analogValue = analogRead(A0); // scales it to use it with the servo (value between 0 and 180) int angle = map(analogValue, 0, 1023, 0, 180); // sets the servo position according to the scaled value myServo.write(angle); // print out the value Serial.print("Analog: "); Serial.print(analogValue); Serial.print(", Angle: "); Serial.println(angle); delay(100); }

Quick Steps

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Arduino IDE Upload Code
  • Open Serial Monitor
  • Rotate the potentiometer
  • See the servo motor's rotation
  • See the result on Serial Monitor
  • COM6
    Analog: 0, Angle: 0 Analog: 85, Angle: 14 Analog: 201, Angle: 35 Analog: 286, Angle: 50 Analog: 370, Angle: 65 Analog: 444, Angle: 78 Analog: 521, Angle: 91 Analog: 608, Angle: 106 Analog: 690, Angle: 121 Analog: 793, Angle: 139 Analog: 907, Angle: 159 Analog: 1023, Angle: 180 Analog: 1023, Angle: 180
    Autoscroll Show timestamp
    Clear output
    9600 baud  

Code Explanation

Read the line-by-line explanation in comment lines of source code!

Video Tutorial

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Alternative Servo Motors

The above code also works with the following servo motors:

Alternative Potentiometers

The above code also works with the following rotary angle sensors:

Servo Motor on Commercial Products

  • Robotic Arm Kit for Arduino
  • Otto DIY Robot Builder Kit

Potentiometer on Commercial Products

  • Digital Oscilloscope


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