#include <Servo.h>

Servo myservo;

int pos = 0;

void setup() {
  myservo.attach(11);
}

void loop(){
  for (pos = 0; pos <= 180; pos += 1) {
    myservo.write(pos);
    delay(15);
  
  }

  for (pos = 180; pos >= 0;pos -= 1) {
    myservo.write(pos);
     delay(15);
  }
}