#include <Servo.h>
Servo myservo;

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

void loop() {
  // put your main code here, to run repeatedly:
   myservo.write(180);
   delay(3000);
   myservo.write(90);
   delay(3000);
   myservo.write(0);
   delay(3000);
   myservo.write(90);
   delay(3000);
  
  
  }