#include <Servo.h>


Servo myservo;  // create servo object to control a servo


int potpin = 0;  // analog pin used to connect the potentiometer

int val;    // variable to read the value from the analog pin


void setup() {

  myservo.attach(9);  // attaches the servo on pin 9 to the servo object

}


void loop() {

  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)

  val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)

  myservo.write(val);                  // sets the servo position according to the scaled value

  delay(15);                           // waits for the servo to get there

}