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

int lcdColumns = 16;
int lcdRows = 2;

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

uint8_t colPins[COLS] = { 27, 26, 25, 33 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 5, 17, 12, 14 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);


void setup() {
  Serial.begin(9600);
   // initialize LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();
}

void loop() {
  char key = keypad.getKey();
  lcd.setCursor(0, 1);

  if (key != NO_KEY) {
    lcd.print(key);
  }
}