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

LiquidCrystal_I2C lcd(0x27,16,2);  

#define LED_G 26
#define LED_R 27

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] = {19,18,5,4}; //Sesuaikan PIN pada Keypad-ESP32
byte colPins[KOLOM] = {2,15,13,12}; //Sesuaikan PIN pada Keypad-ESP32
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, BARIS, KOLOM);

char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 2132;    //Password

void setup() 
{
  lcd.init();                      
  lcd.backlight();
  //lcd.setBacklight(HIGH);
  pinMode(LED_G, OUTPUT);
  pinMode(LED_R, OUTPUT);
}

void loop() 
{
  lcd.setCursor(0,0);
  lcd.print("Input Password");      //Tampilan pada layar LCD
  
  customKey = keypad.getKey();    //Baca input keypad

  //------------Prosedur 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){           //Jika password benar, maka
        lcd.setCursor(0,1);
        lcd.print("Access Accepted ");  //Tampilan LCD
        digitalWrite(LED_G, HIGH);
        digitalWrite(LED_R, LOW);
        delay(4000);
        number = 0;
        lcd.clear(); 
        digitalWrite(LED_G, LOW);
        digitalWrite(LED_R, LOW);
      }
      else{                             //Jika salah, maka
        lcd.setCursor(0,1);
        lcd.print("Invalid Password");  //Tampilan LCD
        digitalWrite(LED_G, LOW);
        digitalWrite(LED_R, HIGH);
        delay(4000);
        number = 0;
        lcd.clear();
        digitalWrite(LED_G, LOW);
        digitalWrite(LED_R, LOW);
      }
    break;

    //------------Jika input '*' maka hapus tampilan------------//
    case '*':
      number = 0;
      lcd.clear();
    break;
  }
}