#include <Servo.h>
Servo myservo;

void setup () {
  myservo.attach (9);
  // put your setup code here, to run once:

}

void loop() {
  myservo.write (0);
  delay (500);
  myservo.write (90);
  delay (500);
  myservo.write (180);
  delay (500);
  // put your main code here, to run repeatedly:

}