const int redPins[3] = {32, 33, 12};      
const int yellowPins[3] = {25, 26, 13};  
const int greenPins[3] = {22, 23, 15};   
const int switchPins[3] = {34, 35, 27};   

const unsigned long redTime = 6000;    
const unsigned long yellowTime = 2000; 
const unsigned long greenTime = 6000;  

unsigned long previousMillis[3] = {0, 0, 0}; 
enum LightState { RED, GREEN, YELLOW }; 
LightState currentState[3] = { RED, RED, RED }; 

void setup() {
  for (int i = 0; i < 3; i++) {
    pinMode(redPins[i], OUTPUT);
    pinMode(yellowPins[i], OUTPUT);
    pinMode(greenPins[i], OUTPUT);
    pinMode(switchPins[i], INPUT_PULLUP); 

  
    digitalWrite(redPins[i], HIGH);
    digitalWrite(yellowPins[i], LOW);
    digitalWrite(greenPins[i], LOW);
  }
}

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

  for (int i = 0; i < 3; i++) {
    bool switchState = digitalRead(switchPins[i]) == LOW; 

    if (switchState) {
      digitalWrite(redPins[i], LOW);
      digitalWrite(yellowPins[i], LOW);
      digitalWrite(greenPins[i], LOW);
      currentState[i] = RED; 
      previousMillis[i] = currentMillis; // 
      continue; 
    }

    switch (currentState[i]) {
      case RED:
        if (currentMillis - previousMillis[i] >= redTime) {
          digitalWrite(redPins[i], LOW);
          digitalWrite(greenPins[i], HIGH);
          previousMillis[i] = currentMillis; 
          currentState[i] = GREEN; 
        }
        break;

      case GREEN:
        if (currentMillis - previousMillis[i] >= greenTime) {
          digitalWrite(greenPins[i], LOW);
          digitalWrite(yellowPins[i], HIGH);
          previousMillis[i] = currentMillis; 
          currentState[i] = YELLOW; 
        break;

      case YELLOW:
        if (currentMillis - previousMillis[i] >= yellowTime) {
          digitalWrite(yellowPins[i], LOW);
          digitalWrite(redPins[i], HIGH);
          previousMillis[i] = currentMillis; 
          currentState[i] = RED; 
        }
        break;
    }
  }
}