int Red = 13;
int Yellow = 12;
int Green = 11;

// Определяем состояния светофора
enum TrafficState {RED, RED_YELLOW, GREEN, YELLOW};
TrafficState currentState = RED;

unsigned long previousMillis = 0;

// Длительности состояний в миллисекундах
const unsigned long RED_DURATION = 1000;
const unsigned long RED_YELLOW_DURATION = 1000;
const unsigned long GREEN_DURATION = 1000;
const unsigned long YELLOW_DURATION = 1000;

void setup() {
  pinMode(Red, OUTPUT);
  pinMode(Yellow, OUTPUT);
  pinMode(Green, OUTPUT);
}

void loop() {
  unsigned long currentMillis = millis();

  switch(currentState) {
    case RED:
      digitalWrite(Red, HIGH);
      digitalWrite(Yellow, LOW);
      digitalWrite(Green, LOW);
      if (currentMillis - previousMillis >= RED_DURATION) {
        currentState = RED_YELLOW;
        previousMillis = currentMillis;
      }
      break;

    case RED_YELLOW:
      digitalWrite(Red, HIGH);
      digitalWrite(Yellow, HIGH);
      digitalWrite(Green, LOW);
      if (currentMillis - previousMillis >= RED_YELLOW_DURATION) {
        currentState = GREEN;
        previousMillis = currentMillis;
      }
      break;

    case GREEN:
      digitalWrite(Red, LOW);
      digitalWrite(Yellow, LOW);
      digitalWrite(Green, HIGH);
      if (currentMillis - previousMillis >= GREEN_DURATION) {
        currentState = YELLOW;
        previousMillis = currentMillis;
      }
      break;

    case YELLOW:
      digitalWrite(Red, LOW);
      digitalWrite(Yellow, HIGH);
      digitalWrite(Green, LOW);
      if (currentMillis - previousMillis >= YELLOW_DURATION) {
        currentState = RED;
        previousMillis = currentMillis;
      }
      break;
  }
}