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

const uint8_t BARIS=4;
const uint8_t KOLOM=4;
char keys[BARIS][KOLOM]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

uint8_t rowPins[BARIS]={14,12,19,18};
uint8_t colPins[KOLOM]={5,4,2,15};

Keypad customKeypad= Keypad(makeKeymap(keys), rowPins, colPins,BARIS,KOLOM);

char customKey;
int number = 0;
int password = 1379;

void setup() {
  lcd.init();
  lcd.setBacklight(HIGH);
}

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

  customKey = customKeypad.getKey();

   switch(customKey){
    case '0' ... '9':
      lcd.setCursor(0,1);
      number = number * 10 + (customKey - '0');
      lcd.print(number);
    break;
    case '#':
      if(number == password){           //Jika password benar, maka
        lcd.setCursor(0,1);
        lcd.print("Access Accepted ");  //Tampilan LCD
        number = 0;
        lcd.clear(); 
      }
      else{                             //Jika salah, maka
        lcd.setCursor(0,1);
        lcd.print("Invalid Password");  //Tampilan LCD
        delay(2000);
        number = 0;
        lcd.clear();
      }
    break;
     case '*':
      number = 0;
      lcd.clear();
    break;
  }
}