#include <Servo.h>

Servo servo;
int pos = 0;

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

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = pos; i <= 180; i++){
    servo.write(i);
    delay(15);
    if(i == 180){
      servo.write(0);
      delay(500);
      i = 0;
    }
  }
}