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

const byte Baris = 4; 
const byte Kolom= 4;  

int merah = 25;
int hijau = 26;

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};
byte colPins [Kolom] = {17, 16, 4, 2};

Keypad customKeypad = Keypad( makeKeymap(Keys), rowPins, colPins, Baris, Kolom);

char customKey;         
int angka = 0;         
int password = 555;    

void setup() {
  lcd.init ();              
  lcd.setBacklight(HIGH);   
  pinMode(merah, OUTPUT);
  pinMode(hijau, OUTPUT);
}

void loop() {
  lcd.setCursor(0,0);
  lcd.print("Masukan Password");      
  
  customKey = customKeypad.getKey();  

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

  
    case '#':
      if(angka == password){           
        lcd.setCursor(0,1);
        lcd.print("Access Accepted ");  
        digitalWrite(hijau, HIGH);
        digitalWrite(merah, LOW);
        angka = 0;
        lcd.clear(); 
      }
      else{                             
        lcd.setCursor(0,1);
        lcd.print("Invalid Password");  
        delay(2000);
        digitalWrite(merah, HIGH);
        digitalWrite(hijau, LOW);
        angka = 0;
        lcd.clear();
      }
    break;


    case '*':
      angka = 0;
      lcd.clear();
    break;
  }
}