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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
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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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
This image is created 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
myServo.write(angle);
Arduino Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-servo-motor-controlled-by-potentiometer
*/
#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
- 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
Clear output
9600 baud
Newline
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Video Tutorial
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