#define LED_Merah 26
#define LED_Hijau 27
#define buzzer    25

#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
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] = {14, 12, 19, 18};//connect to the row pinouts of the keypad
byte colPins[KOLOM] =  {5, 4, 2, 15};
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, BARIS, KOLOM);

char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 262005;    //Password
void setup() {
  pinMode(LED_Merah,OUTPUT);
  pinMode(LED_Hijau, OUTPUT);
  pinMode(buzzer, OUTPUT);
  // put your setup code here, to run once:
  lcd.init ();              //Mulai LCD
  lcd.setBacklight(HIGH);   //Nyalakan backlight

}

void loop() {

  lcd.setCursor(0,0);
  lcd.print("Input Password");      //Tampilan pada layar LCD
  
  customKey = customKeypad.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
        delay(1000);
        digitalWrite(LED_Hijau, HIGH);
        tone(buzzer,1000);
        delay(50);
        digitalWrite(LED_Hijau, LOW);
        noTone(buzzer);
        number = 0;
        lcd.setCursor(0,1);
        lcd.print("                "); 
      }
      else{                             //Jika salah, maka
        lcd.setCursor(0,1);
        lcd.print("Invalid Password");  //Tampilan LCD
        digitalWrite(LED_Merah, HIGH);
        tone(buzzer,1000);
        delay(200);
        digitalWrite(LED_Merah, LOW);
        noTone(buzzer);
        delay(200);
        digitalWrite(LED_Merah, HIGH);
        tone(buzzer,1000);
        delay(200);
        digitalWrite(LED_Merah, LOW);
        noTone(buzzer);
        delay(200);
        number = 0;
        lcd.setCursor(0,1);
        lcd.print("                "); 
      }
    break;

    //------------Jika input '*' maka hapus tampilan------------//
    case '*':
      number = 0;
      lcd.setCursor(0,1);
      lcd.print("                "); 
    break;
  }
}