// Include the servo library:
#include "Servo.h"

// Create a new servo object:
Servo myservo;

// Define the servo pin:
#define servoPin 9

void setup() {
  // Attach the Servo variable to a pin:
  myservo.attach(servoPin);
}

void loop() {
  //Get reading from Potentiometer
  int rot=analogRead(A0);
  //Converting reading from Potentiometer to value in the range 0-180
  float angle = rot * (180 / 1023.0);
  //Send Angle to Servo
  myservo.write(angle);
}