int merah = 8;
int kuning = 9;
int hijau = 10;


void setup() {
  Serial.begin(9600);
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(hijau, OUTPUT);
}

void loop() {
  digitalWrite(merah, HIGH);
  digitalWrite(kuning, LOW);
  digitalWrite(hijau, LOW);
  delay(5000);
  digitalWrite(merah, LOW);
  digitalWrite(kuning, HIGH);
  digitalWrite(hijau, LOW);
  delay(2500);
    digitalWrite(merah, LOW);
  digitalWrite(kuning, LOW);
  digitalWrite(hijau, HIGH);
  delay(5000);
}