#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C myLCD(0x27,16,2);
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {11, 10, 9, 8};
byte colPins[COLS] = {7, 6, 5, 4};
Keypad myKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
void setup(){
  myLCD.begin(16,2);
  myLCD.clear();
  myLCD.backlight();
  myLCD.setCursor(0,0);
  Serial.begin(115200);
}
int baris = 0;
int kolom = 0;
void loop(){
  char tombol = myKeypad.getKey();
  if (tombol){
    myLCD.setCursor(kolom,baris);
    myLCD.print(tombol);
    Serial.print(tombol);
    kolom++;
    if (kolom>15) {
      baris++;
      kolom=0;
    }
    if (baris>1) {
      myLCD.clear();
      baris=0;
      kolom=0;
    }
  }
  delay(10);
}