#include <Keypad.h>
const int ROWS = 4;     // จำนวนแถวของ keypad
const int COLS = 4;     // จำนวนคอลัมน์ของ keypad
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {13, 12, 14, 27}; 
byte colPins[COLS] = {26, 25, 33, 32};
char key;    
Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,ROWS,COLS);

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

#define Password_Lenght 7
char Data[Password_Lenght];
char Master[Password_Lenght] = "455669";
byte data_count = 0;
byte master_count = 0;
bool door = 1;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void loop() {
  if (door == 0) {
    key = keypad.getKey();
    if (key == '#') {
      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("Door is close");
      delay(3000);
      door = 1;
      clearData();
    }
  }
  else {
    Open();
  }
}

void clearData() {
  while (data_count != 0) { 
    Data[data_count--] = 0;
  }
  lcd.clear();
  return;
}

void Open() {
  lcd.setCursor(0, 0);
  lcd.print("Password : ");
  key = keypad.getKey();
  if (key) {
    Data[data_count] = key;
    lcd.setCursor(data_count+11, 0);
    lcd.print(Data[data_count]);
    data_count++;
  }
  if (data_count == Password_Lenght - 1) {
    if (!strcmp(Data, Master)) {
      lcd.setCursor(4, 2);
      lcd.print("Door is Open");
      door = 0;
    }
    else {
      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("Wrong Password");
      delay(1000);
      door = 1;
      clearData();
    }
  }
  return;
}