// Define pin numbers for buttons and LEDs
const int buttonPins[6] = {2, 3, 4, 5, 6, 7};
const int ledPins[6] = {8, 9, 10, 11, 12, 13};

// Variables to store the last button state and debounce timing
bool lastButtonState[6] = {true, true, true, true, true, true};  // Default HIGH for INPUT_PULLUP
bool ledState[6] = {false, false, false, false, false, false};  // LED off initially
unsigned long lastDebounceTime[6] = {0, 0, 0, 0, 0, 0}; // Time for debouncing
unsigned long debounceDelay = 50;  // Debounce delay time in milliseconds

// Variable to track the index of the currently ON LED
int currentLed = -1;  // -1 means no LED is currently on

void setup() {
  // Set button pins as input with internal pull-up resistors
  for (int i = 0; i < 6; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP); // Use internal pull-up resistors
    pinMode(ledPins[i], OUTPUT); // Set LED pins as output
  }
}

void loop() {
  // Loop through all buttons
  for (int i = 0; i < 6; i++) {
    int reading = digitalRead(buttonPins[i]);  // Read button state
    unsigned long currentTime = millis();  // Get current time for debouncing

    // Check if the button state has changed (debouncing)
    if (reading != lastButtonState[i]) {
      lastDebounceTime[i] = currentTime;  // Reset debounce timer
    }

    // Only change the LED state if the button has been stable for the debounce period
    if ((currentTime - lastDebounceTime[i]) > debounceDelay) {
      // If the button is pressed (LOW for INPUT_PULLUP), and it's not already ON
      if (reading == LOW && currentLed != i) {
        // Turn off the previous LED if any
        if (currentLed != -1) {
          digitalWrite(ledPins[currentLed], LOW); // Turn off the previous LED
        }
        // Turn on the current LED
        digitalWrite(ledPins[i], HIGH);
        currentLed = i;  // Update the index of the currently ON LED
      }
    }

    // Save the current reading as the last button state for debouncing
    lastButtonState[i] = reading;
  }



  
}