#include <Servo.h>
Servo myservo;
int pos1 = 0;
int pos2 = 90;
int pos3 = 180;

void setup() {
  // put your setup code here, to run once:
  myservo.attach(3);

}

void loop() {
  // put your main code here, to run repeatedly:
  myservo.write(pos1);
  delay(1000);
  myservo.write(pos2);
  delay(1000);
  myservo.write(pos3);
  delay(1000);

}