#include <Servo.h>

Servo serv;

int pos = 0;
void setup() {
  serv.attach(9);
  pinMode(8, INPUT_PULLUP);
  Serial.print("UAS DERI KOMARA 19552011244");
}

void loop() {
  if(digitalRead(8) == LOW) {
    for (pos = 0; pos <= 180; pos += 1) {
      serv.write(pos);
      digitalWrite(13,HIGH);              
      delay(15);                       
    }
    for (pos = 180; pos >= 0; pos -= 1) { 
      serv.write(pos);
      digitalWrite(13,HIGH);              
      delay(15);                       
    }
  } else {
    digitalWrite(13,LOW);   
  }
}