#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {14,12,19,18};
byte colPins[COLS] = {5,4,2,15};
Keypad customKeypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

char customKey;
int number = 0;
int password = 3033;

int buzzer = 25;
int led = 26;

void setup() 
{
  lcd.init();
  lcd.setBacklight(HIGH);
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);
}

void loop() 
{
  lcd.setCursor(0,0);
  lcd.print("Masukkan Password");

  customKey = customKeypad.getKey();

  // jika input berupa angka //
  switch(customKey){
    case '0' ... '9':
      lcd.setCursor(0,1);
      number = number * 10 + (customKey - '0');
      lcd.print(number);
      break;

    // jika input # maka cek password //
    case '#':
    if (number == password){
      lcd.setCursor(0,1);
      lcd.print("Access Accepted ");
      tone(buzzer, 1000);
      delay(2000);
      number = 0;
      lcd.clear();
      noTone(buzzer);
    }
    else {
      lcd.setCursor (0,1);
      lcd.print("Invalid Password");
      digitalWrite(led, HIGH);
      delay(2000);
      number = 0;
      lcd.clear();
      digitalWrite(led, LOW);
    }
  break;
  // jika input * maka hapus tampilan //
  case '*':
    number = 0;
    lcd.clear();
  break;
  }
}