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

#define RELAY 5

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte ROW = 4;
const byte COL = 4;

const char arr[ROW][COL] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte pinRow[] = {13, 12, 11, 10};
byte pinCol[] = {9, 8, 7, 6};

Keypad matriks = Keypad(makeKeymap(arr), pinRow, pinCol, ROW, COL);

char button;
int number = 0;
int password = 2607;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(RELAY, OUTPUT);
}

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

  char button = matriks.getKey();
  switch (button) {
    case '0' ... '9':
      lcd.setCursor(0, 1);
      number = number * 10 + (button - '0');
      lcd.print(number);
      break;

    case '#':
      if (number == password) {
        lcd.setCursor(0, 1);
        lcd.print("Door Is Open");
        digitalWrite(33, HIGH);
        digitalWrite(RELAY, HIGH);
        delay(2000);
        digitalWrite(33, LOW);
        digitalWrite(RELAY, LOW);
        number = 0;
        lcd.clear();

      }
      else {
        lcd.setCursor(0, 1);
        lcd.print("Access Deny");
        delay(5000);
        digitalWrite(26, HIGH);
        digitalWrite(RELAY, HIGH);
        delay(2000);
        digitalWrite(26, LOW);
        digitalWrite(RELAY, LOW);
        number = 0;
        lcd.clear();
      }
      break;

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