int MERAH1=13;
int KUNING1=12;
int HIJAU1=11;
int MERAH2=10;
int KUNING2=9;
int HIJAU2=8;
int MERAH3=7;
int KUNING3=6;
int HIJAU3=5;
int MERAH4=4;
int KUNING4=3;
int HIJAU4=2;

unsigned long previousMillis=0;
const long interval=500;
bool ledState=LOW;

void setup() {
  // put your setup code here, to run once:
  pinMode(HIJAU1,OUTPUT);
  pinMode(KUNING1,OUTPUT);
  pinMode(MERAH1,OUTPUT);
  pinMode(HIJAU2,OUTPUT);
  pinMode(KUNING2,OUTPUT);
  pinMode(MERAH2,OUTPUT);
  pinMode(HIJAU3,OUTPUT);
  pinMode(KUNING3,OUTPUT);
  pinMode(MERAH3,OUTPUT);
  pinMode(HIJAU4,OUTPUT);
  pinMode(KUNING4,OUTPUT);
  pinMode(MERAH4,OUTPUT);

  digitalWrite(HIJAU1, HIGH);
  digitalWrite(KUNING1,HIGH);
  digitalWrite(MERAH1,HIGH);
  digitalWrite(HIJAU2,HIGH);
  digitalWrite(KUNING2,HIGH);
  digitalWrite(MERAH2,HIGH);
  digitalWrite(HIJAU3,HIGH);
  digitalWrite(KUNING3,HIGH);
  digitalWrite(MERAH3,HIGH);
  digitalWrite(HIJAU4,HIGH);
  digitalWrite(KUNING4,HIGH);
  digitalWrite(MERAH4,HIGH);
  delay(2000); 
  digitalWrite(HIJAU1, LOW);
  digitalWrite(KUNING1,LOW);
  digitalWrite(MERAH1,LOW);
  digitalWrite(HIJAU2,LOW);
  digitalWrite(KUNING2,LOW);
  digitalWrite(MERAH2,LOW);
  digitalWrite(HIJAU3,LOW);
  digitalWrite(KUNING3,LOW);
  digitalWrite(MERAH3,LOW);
  digitalWrite(HIJAU4,LOW);
  digitalWrite(KUNING4,LOW);
  digitalWrite(MERAH4,LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    ledState = !ledState;
    digitalWrite(KUNING1, ledState);
    digitalWrite(KUNING3, ledState);
  }
  digitalWrite(HIJAU2, LOW);
  digitalWrite(MERAH4, LOW);
  digitalWrite(KUNING2, LOW);
  digitalWrite(MERAH2, HIGH);
  digitalWrite(KUNING4, LOW);
  digitalWrite(HIJAU4, HIGH);
  delayNonBlocking(6000);
  digitalWrite(KUNING2, HIGH);
  digitalWrite(KUNING4, HIGH);
  delayNonBlocking(2000);
  digitalWrite(HIJAU4,LOW);
  digitalWrite(MERAH2, LOW);
  digitalWrite(HIJAU2, HIGH);
  digitalWrite(KUNING2, LOW);
  digitalWrite(KUNING4, LOW);
  digitalWrite(MERAH4, HIGH);
  delayNonBlocking(6000);
  digitalWrite(KUNING2, HIGH);
  digitalWrite(KUNING4, HIGH);
  delayNonBlocking(2000);
}

void delayNonBlocking(unsigned long delayTime) {
  unsigned long start = millis();
  while (millis() - start < delayTime) {
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval) {
      previousMillis = currentMillis;
      ledState = !ledState;
      digitalWrite(KUNING1, ledState);
      digitalWrite(KUNING3, ledState);
    }
  }
}