void setup() {
//program ini berfungsi sebagai inisialisasi //LED pin menggunakan pin 2,3 dan 4 for(int LED = 2; LED<=4; LED++){
for(int LED = 2; LED<=13 ; LED++){
pinMode(LED, OUTPUT);
}
}
void loop() {
//program untuk menyalakan LED bergantian
for (int LED = 2; LED<= 13; LED++){
//LED akan menyala dan mati sesuai urutan dari pin
//hingga pin 4
digitalWrite(LED, HIGH); 
delay(200);
digitalWrite(LED, LOW);
}

for (int LED = 2; LED <= 13; LED++){
    digitalWrite(LED, LOW);
    delay(50);
}


for (int LED = 13; LED >= 2; LED--) {
      digitalWrite(LED, HIGH);
    delay(200);
    digitalWrite(LED, LOW);
  }

for (int LED = 2; LED <= 13; LED++){
  digitalWrite(LED, LOW);
  delay(50);
}  
}