#include <Keypad.h>

// Define the password
const String password = "1234";
String inputPassword = "";

// Define LED and buzzer pins
const int ledPin = 12;
const int buzzerPin = 4; // New pin for the buzzer

// Define keypad size and connections
const byte ROWS = 4; // Four rows
const byte COLS = 4; // Four columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {13, 14, 27, 26}; // Connect to the row pinouts of the keypad
byte colPins[COLS] = {25, 33, 32, 15}; // Connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

bool ledState = false;
unsigned long startMillis = 0;
const long delayTime = 10000; // 10 seconds delay

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT); // Set the buzzer pin as output
  digitalWrite(ledPin, LOW); // Start with the LED off
  digitalWrite(buzzerPin, LOW); // Start with the buzzer off
}

void loop() {
  char key = keypad.getKey(); // Get key press

  if (key) { // If a key is pressed
    Serial.println(key); // Print the pressed key
    if (key == '#') { // # key to submit the password
      if (inputPassword == password) {
        Serial.println("Password Correct!");
        digitalWrite(ledPin, HIGH); // Turn on the LED
        ledState = true;
        startMillis = millis(); // Save the time LED was turned on
      } else {
        Serial.println("Incorrect Password!");
        digitalWrite(buzzerPin, HIGH); // Turn on the buzzer for incorrect password
        delay(1000); // Buzzer sound duration (1 second)
    
      }
      inputPassword = ""; // Clear the input for the next attempt
    } else if (key == '*') { // * key to clear the input
      inputPassword = "";
      Serial.println("Input Cleared");
    } else {
      inputPassword += key; // Add the key to the password input
    }
  }

  // Check if LED should be turned off after 10 seconds
  if (ledState && (millis() - startMillis >= delayTime)) {
    digitalWrite(ledPin, LOW); // Turn off the LED
    ledState = false;
    Serial.println("LED turned off after 10 seconds");
  }
}