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

#define  I2C_ADDR 0x27
#define  LCD_COLUMNS 16
#define  LCD_ROWS 2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_ROWS);


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

uint8_t colPins[4] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[4] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, 4, 4);


void setup() {

  lcd.init();
  lcd.backlight();

  Serial.begin(9600);
}

void loop() {

  char keys[] = {};
  keys = keypad.getKey();
  lcd.print(keys[0]);

}