#include <Servo.h>
Servo myservo;
void setup() {
  // put your setup code here, to run once:
  myservo.attach(9);
  myservo.write(0);

}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i=0;i<=180;i++){
    myservo.write(i);
    delay(15);
  }
  for(int j=180;j>=0;j--){
    myservo.write(j);
    delay(15);
  }

}