#include <Servo.h>

Servo myservo;
int potpin = A0;  // analog pin used to connect the potentiometer
int val; // variable to read the value from the analog pin

void setup() {
  myservo.attach(9);  // attaches servo on pin 9 to the servo object
  Serial.begin(9600);
}

void loop() {
  val = analogRead(potpin);  // read value of the potentiometer (0 to 1023)
  val = map(val, 0, 1023, 0, 180);  // mapping it together with servo motor
  myservo.write(val); // sets servo position according to scaled value
  Serial.print("Angle: ");  // printing angle
  Serial.println(val);
  delay(500);
}