#include <Wire.h>
#include <Keypad.h>

#define Password_Length 9

int ledPin = 13;  // Set the pin for the LED (you can change this to any available digital pin)

char Data[Password_Length]; 
char Master[Password_Length] = "12345678"; 
byte data_count = 0;
char customKey;

const byte ROWS = 4;
const byte COLS = 4;

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(ledPin, OUTPUT); // Set the LED pin as output
}

void loop() {
  Serial.println("Enter Password:");

  customKey = customKeypad.getKey();
  if (customKey) {
    Data[data_count] = customKey; 
    Serial.print(Data[data_count]); 
    data_count++; 
  }

  if (data_count == Password_Length-1 ) {
    Serial.println(); // Print a new line after the password entry

    if (!strcmp(Data, Master)) {
      Serial.println("Correct");
      digitalWrite(ledPin, HIGH);  // Turn the LED on
      delay(5000);                 // Keep the LED on for 5 seconds
      digitalWrite(ledPin, LOW);   // Turn the LED off
    } else {
      Serial.println("Incorrect");
      delay(1000);  // Wait for 1 second before clearing the data
    }
    
    clearData();  
  }
}

void clearData() {
  while (data_count != 0) {
    Data[data_count--] = 0; 
  }
}