#include <Wire.h>
#include <LiquidCrystal.h>
#include <Keypad.h>
// Aditya Vijay Patil
// Define the LCD
// LCD GP no. connections
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);

// Keypad 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'}
};

//connect to the row pinouts of the keypad
byte rowPins[ROWS] = {26, 22, 21, 20}; 
//connect to the column pinouts of the keypad
byte colPins[COLS] = {19, 18, 17, 16};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Define correct password
const char* correctPassword = "9421";

void setup() {
  lcd.begin(20, 4); // initialize the LCD
  lcd.setCursor(0, 0);
         //  12345678901234567890
  lcd.print("Keypad Door Lock");
  lcd.setCursor(0, 1);
  lcd.print("Enter Your Password");
  lcd.setCursor(0, 2);
  lcd.print("To Open Door");
  lcd.setCursor(0, 3);
  lcd.print("Password : ");
}

void loop() {
  char enteredPassword[5];
  int passwordIndex = 0;

  // Get the password from the keypad
  while (passwordIndex < 4) {
    char key = keypad.getKey();
    if (key) {
      enteredPassword[passwordIndex++] = key;
      lcd.clear();
      lcd.print("Password : ");
      lcd.setCursor(12, 3);
      lcd.print(enteredPassword);
      delay(500); // Wait for 500 milliseconds to avoid rapid key presses
      // lcd.clear();
    }
  }

  // Null-terminate the entered password
  enteredPassword[4] = '\0';

  lcd.clear();

  // Check the entered password
  if (strcmp(enteredPassword, correctPassword) == 0) {
    lcd.print("Successfully");
    lcd.setCursor(0, 1);
    lcd.print("Door");
    lcd.setCursor(0, 2);
    lcd.print("Open");
    delay(5000); // Wait for 5 seconds
    lcd.clear();
    lcd.print("Enter your password");
  } else {
    lcd.print("Incorrect password");
    delay(2000); // Wait for 2 seconds
  }

  lcd.clear();
  lcd.print("Enter your password");
}