#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// Constants
#define DHTPIN 2         // Pin connected to DHT22 data pin
#define DHTTYPE DHT22    // DHT sensor type
#define I2C_ADDR 0x27    // I2C address for the LCD display
#define LCD_COLS 16      // Number of LCD columns
#define LCD_ROWS 2       // Number of LCD rows

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize LCD display
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLS, LCD_ROWS);

// Blynk authentication token
char auth[] = "wjxFvIQevcuEhuYSSECQZqhnRxbU7YWl";

// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

void setup() {
  // Initialize serial communication
  Serial.begin(115200);
  //lcd.begin(16, 2);
  // Initialize DHT sensor
  dht.begin();

  // Initialize LCD display
  lcd.begin(LCD_COLS, LCD_ROWS);
  lcd.backlight();
  lcd.clear();
  lcd.print("Temp: ");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");

  // Connect to Wi-Fi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  // Connect to Blynk
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  // Run Blynk
  Blynk.run();

  // Read temperature and humidity from DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check if any reading failed
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Update LCD display
  lcd.setCursor(6, 0);
  lcd.print(temperature);
  lcd.print("C");
  lcd.setCursor(10, 1);
  lcd.print(humidity);
  lcd.print("%");

  // Print temperature and humidity to serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Send temperature and humidity data to Blynk
  Blynk.virtualWrite(V1, temperature);
  Blynk.virtualWrite(V2, humidity);

  delay(2000); // Wait for 2 seconds before the next reading
}