Wiring the XIAO ESP32C3 with DHT11 Sensor

• Connect the OUT pin of the DHT11 to pin D10 on the XIAO ESP32C3.
• Connect the Vcc pin of the DHT11 to 3.3V on the XIAO ESP32C3.
• Connect the GND pin of the DHT11 to GND on the XIAO ESP32C3.

ESP32C3 reads DHT11 sensor data and sends temperature & humidity via Wi-Fi HTTP request.ThingSpeak stores the data and visualizes it in graphs.No Serial Communication, Just using Wi-Fi HTTP!

ESP32 as an HTTP Server- Your XIAO ESP32C3 will act as a web server and serve data over HTTP

The sensor readings will access using local WiFi network via a browser. uploaded the following code to esp32c3

#include 
#include 
#include 

// Replace with your network credentials
const char* ssid = "sujith";
const char* password = "123456878";

// DHT11 setup
#define DHTPIN D10      // GPIO connected to DHT11 data pin
#define DHTTYPE DHT11  // DHT 11 sensor type
DHT dht(DHTPIN, DHTTYPE);

// Create a web server on port 80
WebServer server(80);

void handleRoot() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check for errors
  if (isnan(temperature) || isnan(humidity)) {
    server.send(200, "text/html", "
Failed to read from DHT sensor!
");
    return;
  }

  String html = "";
  html += "";
  html += "
DHT11 Sensor Data
";
  html += "
Temperature: " + String(temperature) + " °C
";
  html += "
Humidity: " + String(humidity) + " %
";
  html += "";

  server.send(200, "text/html", html);
}

void setup() {
  // Start serial communication
  Serial.begin(115200);
  dht.begin();

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected! IP address:");
  Serial.println(WiFi.localIP());

  // Define root route
  server.on("/", handleRoot);

  // Start the server
  server.begin();
}

void loop() {
  // Handle incoming client requests
  server.handleClient();
}

After uploading the code, IP address will be generated 192.168.137.41, copied to the webbrowser and see the data in web

Problems faced in learning MQTT Protocol

Tried to Publish Sensor Data to MQTT Server & Mobile App. I have created the hivemq.cloud free account for this progran

Tried to use Hivemq server, login created and again i m unsuccessful, almost two day i spent with this, i watched so many tutorials, but i m failed to get my results



Next to that, Tried to use Node-red , created the dashboard, I m able to upload the code , no error, data is not pushed



Next to that, Tried to use Adafruit io , created the dashboard, I m able to upload the code , i m not able to push the data,



I have spent almost four days on learning different platforms like Node-red, Adafruit, HivemQ, EClipse Mosquito without success. I hope to identify the errors in my code and learn from them as quickly as possible.