int led_red = 12;
int led_yellow = 11;
int led_green = 10;

int red_time = 4000;
int red_yellow_time = 1000;
int yellow_time = 1000;
int green_time = 4000;

void setup() {
  // Dijital girişler ayarlanacak
  /***************************************
    |     I/O Ayarları
  ****************************************/
  digitalWrite(led_red, HIGH);
  digitalWrite(led_yellow, LOW);
  digitalWrite(led_green, LOW);

  pinMode(led_red, OUTPUT);
  pinMode(led_yellow, OUTPUT);
  pinMode(led_green, OUTPUT);
}

void loop() {
  /******************************************** 
   * Trafik ışıkları
   * Kırmızı , Kırmızı-Sarı, Yeşil, Sarı
   Sırasında yakılacak
  ********************************************/
  digitalWrite(led_red, HIGH);
  digitalWrite(led_yellow, LOW);
  digitalWrite(led_green, LOW);
  delay(red_time);

  digitalWrite(led_red, HIGH);
  digitalWrite(led_yellow, HIGH);
  digitalWrite(led_green, LOW);
  delay(red_yellow_time);

  digitalWrite(led_red, LOW);
  digitalWrite(led_yellow, LOW);
  digitalWrite(led_green, HIGH);
  delay(green_time);

  digitalWrite(led_red, LOW);
  digitalWrite(led_yellow, HIGH);
  digitalWrite(led_green, LOW);
  delay(yellow_time);
}