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

const byte ROWS = 4;    
const byte 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 }; 
byte colPins[COLS] = { 5, 4, 2, 15 };

Keypad customKeypad = Keypad( makeKeymap(Keys), rowPins, colPins, ROWS, COLS);    //Masukkan info keypad pada library

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){           
        lcd.setCursor(0,1);
        lcd.print("Access Accepted ");  
        delay(2000);
        number = 0;
        lcd.clear(); 
      }
      else{                             
        lcd.setCursor(0,1);
        lcd.print("Invalid Password"); 
        delay(2000);
        number = 0;
        lcd.clear();
      }
    break;

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