// Menentukan pin LED
const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int led4 = 5;
const int led5 = 6;
const int led6 = 7;
const int led7 = 8;
const int led8 = 9;
const int led9 = 10;
const int led10 = 11;
const int led11 = 12;
const int led12 = 13;
const int led =1;

const int buttonPin = A0;

void setup() {
  // Mengatur pin LED sebagai OUTPUT
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led7, OUTPUT);
  pinMode(led8, OUTPUT);
  pinMode(led9, OUTPUT);
  pinMode(led10, OUTPUT);
  pinMode(led11, OUTPUT);
  pinMode(led12, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(led, OUTPUT);
}

void loop() {
  // Membaca status tombol tekan
  int buttonState = digitalRead(buttonPin);

  // Jika tombol ditekan (pin membaca LOW), LED dan lampu lalu lintas menyala
  if (buttonState == LOW) {
    digitalWrite(led, HIGH);

    // lampu  merah
  digitalWrite(led1, HIGH);
  digitalWrite(led4, HIGH);
  digitalWrite(led7, HIGH);
  digitalWrite(led10, HIGH);

  //lampu pertama a
  delay(5000);
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  delay(2000);
  digitalWrite(led2, LOW);
  digitalWrite(led3, HIGH);
  delay(5000);
  digitalWrite(led3, LOW);
  digitalWrite(led1, HIGH);

  //lampu b
  digitalWrite(led4, LOW);
  digitalWrite(led5, HIGH);
  delay(2000);
  digitalWrite(led5, LOW);
  digitalWrite(led6, HIGH);
  delay(5000);
  digitalWrite(led6, LOW);
  digitalWrite(led4, HIGH);

  //lampu c
  digitalWrite(led7, LOW);
  digitalWrite(led8, HIGH);
  delay(2000);
  digitalWrite(led8, LOW);
  digitalWrite(led9, HIGH);
  delay(5000);
  digitalWrite(led9, LOW);
  digitalWrite(led7, HIGH);

  //lampu d
  digitalWrite(led10, LOW);
  digitalWrite(led11, HIGH);
  delay(2000);
  digitalWrite(led11, LOW);
  digitalWrite(led12, HIGH);
  delay(5000);
  digitalWrite(led12, LOW);
  digitalWrite(led1, HIGH);
  } 
  // Jika tombol tidak ditekan (pin membaca HIGH), LED dan lampu lalu lintas mati
  else {
  digitalWrite(led, LOW);

  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led5, LOW);
  digitalWrite(led6, LOW);
  digitalWrite(led7, LOW);
  digitalWrite(led8, LOW);
  digitalWrite(led9, LOW);
  digitalWrite(led10, LOW);
  digitalWrite(led11, LOW);
  digitalWrite(led12, LOW);
  }
}