// Include LCD Library
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
// Include Keypad Library 
#include <Keypad.h>

// Define the LCD connections to the Arduino
LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte ROWS = 4; // Number of rows on the keypad
const byte COLS = 4; // Number of columns on the keypad

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

// Intializing the keypad connections to the Arduino with respective pins.
byte rowPins[ROWS] = {13, 12, 11, 10};
byte colPins[COLS] = {7, 6, 5, 4};

// Create the Keypad object
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  // Initialize the LCD
  lcd.init();
  lcd.backlight();
}

void loop() {
  // Get the key that was pressed
  char key = keypad.getKey();
  
  // If a key was pressed, print it to the LCD and the Serial Monitor
  if (key != NO_KEY) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Key Pressed: ");
    lcd.print(key);
  }
}