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

const byte rows = 4;
const byte coloumns = 4;

char keypadKeys[rows][coloumns] = {
  {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'}
};

byte keypadPinRows[rows] = {13, 12, 11, 10};
byte keypadPinCollumns[coloumns] = {9, 8, 7, 6};

Keypad thisKeyPad = Keypad(makeKeymap(keypadKeys), keypadPinRows, keypadPinCollumns, rows, coloumns);

LiquidCrystal_I2C display(0x27, 16, 2);

void setup() {
  display.init();
  display.backlight();
  display.setCursor(0,0);

}

void loop() {
  char key = thisKeyPad.getKey();
  if(key != NO_KEY){
    display.print(key);
  }
  if (key == 'C'){
    display.clear();
  }
  
}