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

#include <Keypad.h>

const byte ROWS = 4; //4 baris
const byte COLS = 4; //4 kolom

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

byte rowPins[ROWS] = {9, 8, 7, 6}; //pin 9, 8, 7, 6
byte colPins[COLS] = {5, 4, 3, 2}; //pin 5, 4, 3, 2

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

int i = 0;
int j = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  lcd.print("Opening...");
  delay(3000);
  lcd.clear();
  lcd.print("Welcome...");
  delay(3000);
  lcd.clear();
}

void loop() {
  char key = keypad.getKey();
  if(key) {
    if (key == 'C'){
      lcd.clear();
      i = 0;
      j = 0;
    } 
    
    else {
      if (i == 16) {
        i = 0;
        j++;
      }
    lcd.setCursor(i,j);
    lcd.print(key);
    i++;
    delay(50);
    }
  }
}