ESP32 Environmental Monitoring System

#include <WiFi.h>
#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int mq135Pin = 36;
const char* ssid = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

void setup() {
  Serial.begin(115200);
  dht.begin();
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi Connected");
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int airQuality = analogRead(mq135Pin);

  Serial.print("Temperature: "); Serial.print(temperature); Serial.print(" °C, ");
  Serial.print("Humidity: "); Serial.print(humidity); Serial.print(" %, ");
  Serial.print("Air Quality: "); Serial.println(airQuality);

  sendToServer(temperature, humidity, airQuality);
  delay(5000);
}

void sendToServer(float temp, float hum, int air){
  if(WiFi.status() == WL_CONNECTED){
    WiFiClient client;
    HTTPClient http;
    String url = "http://yourserver.com/update?temp=" + String(temp) + "&hum=" + String(hum) + "&air=" + String(air);
    http.begin(client, url);
    int code = http.GET();
    http.end();
  }
}