Arduino rotates a servo motor using a potentiometer

In the previous post, I use three tactile switches to rotate a servo motor to three angle positions. However, using a potentiometer, we can continuously rotates the angle of servo motor in accordance to the adjustment of the potentiometer. 

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A picture of this example

With the  Arduino Servo.h and analogRead function, this task could be done easily. In this example, a potentiometer connects to pin A0 work as an analog input adjusting the angle of rotation. A servo again, connects to pin A3.

Connections Diagram

The analogRead() function return a 10-bit (1024) value from any reading from a specific analog input pin. Hence, this analog value must convert from 1024 to 180 in degree. This could be done by a simple equation as will be shown in source code.

	#include<Servo.h>
	//Create A servo object
	Servo sg90;
	//Servo connects to A3
	#define sg90Pin A3
	void setup() {
	sg90.attach(sg90Pin);
	}
	void loop() {
	//Read analog value from a POT
	long angleInput=analogRead(A0);
	//Convert to angle
	angleInput=angleInput*180/1024;
	//send angle value to servo
	sg90.write(angleInput);
	delay(50);
	}

view raw analogReadServo.ino hosted with ❤ by GitHub

Click here to download the sketch archive of this example.