#include <LiquidCrystal_I2C.h>  // DHT sensor library for DHT11/ DHT22
#include <WiFi.h>               // ESP32 Wi-Fi library
#include "DHT.h"                // DHT sensor driver library

// Define variables for LCD
#define I2C_ADDR 0x27           // LCD I2C address (Typically is 0x27 or 0x3F)
#define LCD_COLUMNS 16          // Number of LCD columns
#define LCD_LINES 2             // Number of LCD lines
// Define DHT sensor type and pin
#define DHTPIN 4                                          // DHT22 sensor connected to GPIO4
#define DHTTYPE DHT22                                     // Use DHT22 type

DHT dht(DHTPIN, DHTTYPE);                                 // Create DHT sensor object
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);  // Create LCD object

// Wi-Fi credentials (Wokwi provides free virtual Wi-Fi)
const char* ssid = "Wokwi-GUEST";   // Use "Wokwi-GUEST" for simulation
const char* password = "";          // No password needed for Wokwi Wi-Fi simulation

void setup() {
  Serial.begin(115200);   // Initialise serial comunication
  dht.begin();            // Initialize DHT sensor
  lcd.init();             // Initialise LCD
  lcd.backlight();        // Turn on LCD backlight

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);                 // Start Wi-Fi connection
  Serial.print("Connecting to Wi-Fi...");
  while (WiFi.status() != WL_CONNECTED) {     // Wait until connected
    delay(1000);                              // Wait for Wi-Fi to connect and print '.' symbol (1 seconds)
    Serial.print(".");
  }
  Serial.println("\nConnected to Wi-Fi!");
  Serial.println("ESP32 IP Address: " + WiFi.localIP().toString()); // Print ESP32's IP address
}

void loop() {
  // Read temperature fromm virtual DHT22
  float temperature = dht.readTemperature();  // Temperature in Celsius
  float humidity = dht.readHumidity();        // Humidity in %

  // Check whether the data is valid
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    // Display data on LCD
    lcd.setCursor(0, 0);                                                  // Set cursor to column 0, row 0
    lcd.print(" Temp: " + String(temperature, 1) + "\xDF" + "C ");
    lcd.setCursor(0, 1);                                                  // Set cursor to column 0, row 1
    lcd.print("Humidity: " + String(humidity, 1) + "% ");

    // Print result
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print("°C | Humidity: ");
    Serial.print(humidity);
    Serial.println("%");
  } 
  delay(5000);  // Update every 5 seconds
}