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

#define BUZZ 25
#define PINRED 26
#define PINGREEN 27

LiquidCrystal_I2C lcd(0x27,16,2);

const int ROWS = 4;
const int 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}; //r1,r2,r3,r4
byte colPins[COLS] =  {5, 4, 2, 15}; //c1,c2,c3,c4

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

char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 1379;    //Password

void setup(){
  pinMode(PINRED, OUTPUT);
  pinMode(PINGREEN, OUTPUT);
  pinMode(BUZZ, OUTPUT);
  digitalWrite(PINRED, LOW);
  digitalWrite(PINGREEN, LOW);

  lcd.init();           //Mulai LCD                      
  lcd.backlight();      //Nyalakan backlight
}

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

  char 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
        delay(2000);
        digitalWrite(PINGREEN, HIGH);
        digitalWrite(PINRED, LOW);
        tone(BUZZ,392,100); //g
        tone(BUZZ,440,100); //a
        tone(BUZZ,494,100); //b
        tone(BUZZ,523,100); //c
        number = 0;
        lcd.clear(); 
      }
      else{                             //Jika salah, maka
        lcd.setCursor(0,1);
        lcd.print("Invalid Password");  //Tampilan LCD
        delay(2000);
        digitalWrite(PINRED, HIGH);
        digitalWrite(PINGREEN, LOW);
        tone(BUZZ,262,100); //c
        tone(BUZZ,294,100); //d
        tone(BUZZ,330,100); //e
        tone(BUZZ,349,100); //f
        number = 0;
        lcd.clear();
      }
    break;

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