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

const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};
byte rowPins[ROWS] = {2, 3, 4, 5};
byte colPins[COLS] = {6, 7, 8};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x27, 16, 2);

const String PASSWORD = "091235";
String inputPassword;

const int RED_LED = 9;
const int GREEN_LED = 10;
const int BLUE_LED = 11;

const int SUBMIT_BTN = 12;
const int CLEAR_BTN = 13;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.print("Enter Password:");
  lcd.setCursor(0, 1);

  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);

  pinMode(SUBMIT_BTN, INPUT_PULLUP);
  pinMode(CLEAR_BTN, INPUT_PULLUP);
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    if (key != '*' && key != '#' && inputPassword.length() < 6) {
      inputPassword += key;
      lcd.print("*");
      digitalWrite(BLUE_LED, HIGH);
      digitalWrite(RED_LED, LOW);
      digitalWrite(GREEN_LED, LOW);
    }
  }

  if (digitalRead(SUBMIT_BTN) == LOW) {
    if (inputPassword == PASSWORD) {
      lcd.clear();
      lcd.print("Access Granted!");
      digitalWrite(GREEN_LED, HIGH);
      digitalWrite(RED_LED, LOW);
      digitalWrite(BLUE_LED, LOW);
    } else {
      lcd.clear();
      lcd.print("Access Denied!");
      lcd.setCursor(0, 1);
      lcd.print("Wrong Password!");
      for (int i = 0; i < 3; i++) {
        digitalWrite(RED_LED, HIGH);
        delay(500);
        digitalWrite(RED_LED, LOW);
        delay(500);
      }
      lcd.clear();
      lcd.print("Enter Password:");
      lcd.setCursor(0, 1);
      inputPassword = "";
    }
    delay(200);
  }

  if (digitalRead(CLEAR_BTN) == LOW) {
    inputPassword = "";
    lcd.clear();
    lcd.print("Enter Password:");
    lcd.setCursor(0, 1);
    delay(200);
  }
}