#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <Keypad.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

// LCD setup
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the I2C address if necessary

// Servo setup
Servo motor;
const int motorPin = 11;
int motorPosition = 0;

// Keypad setup
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] = {9, 8, 7, 6}; // R1, R2, R3, R4
byte colPins[COLS] = {5, 4, 3, 2}; // C1, C2, C3, C4
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

// PIR motion sensor setup
const int pirPin = 12;

// DHT22 setup
#define DHTPIN 13
#define DHTTYPE DHT22
DHT_Unified dht(DHTPIN, DHTTYPE);
sensors_event_t event;

// Password setup
const char* correctPassword = "0000";
char enteredPassword[5] = "";
boolean passwordEntered = false;

void setup() {
  // LCD initialization
  lcd.init();
  lcd.backlight();

  // Servo initialization
  motor.attach(motorPin);
  motor.write(motorPosition);

  // DHT22 initialization
  dht.begin();

  // Initialize Serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  if (!passwordEntered) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Enter the password");
    delay(175);
    char key = keypad.getKey();
    if (key) {
      if (key == '#') {
        if (strcmp(enteredPassword, correctPassword) == 0) {
          passwordEntered = true;
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Password correct");
          delay(1000);
        } else {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Wrong password");
          delay(500);
        }
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Enter the password");
        
        memset(enteredPassword, 0, sizeof(enteredPassword));
      } else if (key == '*') {
        memset(enteredPassword, 0, sizeof(enteredPassword));
      } else {
        strncat(enteredPassword, &key, 1);
      }
    }
    
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    dht.temperature().getEvent(&event);
    lcd.print("Temp: ");
    lcd.print(event.temperature);
    lcd.print(" C");
     delay(125); 
    lcd.setCursor(0, 1);
    dht.humidity().getEvent(&event);
    lcd.print("Humid: ");
    lcd.print(event.relative_humidity);
    lcd.print(" %");
     delay(125); 

    int motionValue = digitalRead(pirPin);
    if (motionValue == HIGH) {
      motor.write(90);
    } else {
      motor.write(0);
    }
  }
}