#include <Wire.h> 
#include <Keypad.h>
#include <​LiquidCrystal_I2C​.​h​>
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​)​;​LiquidCrystal_I2C lcd(0x27, 16, 2);  

        void setup(){
          lcd.backlight();
            lcd.init(); 
            }void loop(){
              char customKey = customKeypad​.​getKey​(​)​;
                if (customKey){
                    lcd.clear();
                        lcd.setCursor(0, 0); 
                            lcd​.​print​(​customKey​)​;
                              }}