#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

// Initialize the LCD library with the I2C address and the LCD dimensions
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int ROW_NUM = 4; 
const int COLUMN_NUM = 4;
char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'},
};
byte pin_rows[ROW_NUM] = {32, 33, 25, 26};   
byte pin_column[COLUMN_NUM] = {27, 14, 12, 13}; 

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);


void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Code:");
}

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

  if (key) {
     lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(key);
  }
    
}