#include <Servo.h> // import servo library

Servo myservo;

int servoPin = 3; // pin used for servo
int potPin = 0; // potentiometer pin
int potVal; // potentiometer value

void setup() {
  // put your setup code here, to run once:
  myservo.attach(servoPin);
}

void loop() {
  // put your main code here, to run repeatedly:
  potVal = analogRead(potPin); // get the value of potentiometer
  potVal = map(potVal, 0, 1023, 0, 180); // scale value to use it for servo
  myservo.write(potVal); // set servo position
  delay(15); // delay 15 ms
}