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

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

byte rowPins[BARIS] = {14,12,19,18};
byte colPins[KOLOM] = {3,4,2,15};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, BARIS, KOLOM);
void setup(){
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
}

void loop(){
  char key = keypad.getKey();

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