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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte col = 4;
const byte bar = 4;
char datakey[col][bar] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte colpin[col] = {9, 8, 7, 6};
byte barpin[bar] = {5, 4, 3, 2};

Keypad keypad = Keypad(makeKeymap(datakey), colpin, barpin, col, bar);
int x = 0;
int y = 0;

void setup() {
  lcd.init();
  lcd.backlight();
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    lcd.setCursor(x,y);
    lcd.print(key);
    x++;
  }if(key == '#') {
    lcd.clear();
    x = 0;
    y = 0;
  }if(x == 16) {
    y = 1;
    x = 0;
  }
}