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

LiquidCrystal_I2C lcd(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] = {9,8,7,6};
byte colPins[COLS] = {5,4,3,2};
Keypad customkeypad = Keypad(makeKeymap(hexakeys),rowPins,colPins,ROWS,COLS);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

}

void loop() {
  // put your main code here, to run repeatedly:
  static int c = 0;
  static int r = 0;
  char customKey = customkeypad.getKey();
  if(customKey)
  {
    lcd.setCursor(c,r);
    lcd.print(customKey);
    c++;
    if(c==16 && r==0)
    {
      c = 0;
      r = 1;
    }
  }
}