ESP32 DHT11 Web Server

An ESP32-based web server that allows you to monitor real-time temperature and humidity readings from a DHT11 sensor via a web browser.

Features

• Real-time Data: Displays live temperature and humidity readings.
• Web Interface: Access sensor data from any device on the same local network via a simple web page.
• Auto-Refresh: The web page automatically refreshes every 5 seconds for up-to-date data.
• Simple Setup: Easy to configure and deploy on an ESP32 board.

Hardware Requirements

• ESP32 Development Board (e.g., ESP32-WROOM-32)
• DHT11 Temperature and Humidity Sensor
• Jumper wires
• Breadboard (optional)

Software Requirements

• Arduino IDE
• ESP32 Boards Manager (installation instructions here)
• Libraries:
  • WiFi.h (comes with ESP32 board package)
  • DHT.h (install via Arduino IDE: Sketch > Include Library > Manage Libraries... search for "DHT sensor library by Adafruit")

Circuit Diagram

Connect the DHT11 sensor to your ESP32 board as follows:

• DHT11 VCC -> ESP32 3.3V
• DHT11 GND -> ESP32 GND
• DHT11 Data Pin -> ESP32 GPIO 18 (or any other digital pin, remember to update #define DHTPIN in the code)

(Consider adding a simple Fritzing diagram or a hand-drawn diagram picture here later)

Installation and Setup

1. Open in Arduino IDE: Open the main.ino (or your sketch file name) in the Arduino IDE.
2. Install Libraries: Ensure you have the DHT sensor library by Adafruit installed via the Library Manager.
3. Select Board: Go to Tools > Board > ESP32 Arduino and select your specific ESP32 board (e.g., ESP32 Dev Module).
4. Select Port: Go to Tools > Port and select the serial port connected to your ESP32.
5. Configure WiFi Credentials:
   • IMPORTANT: For security reasons, sensitive information like WiFi credentials should ideally be stored outside the main code or handled securely.
   • In main.ino, replace "YOUR_SSID" and "YOUR_PASSWORD" with your actual WiFi network name and password:

     const char* ssid = "YOUR_SSID";       // REPLACE with your WiFi SSID
     const char* password = "YOUR_PASSWORD"; // REPLACE with your WiFi password

     (If you implemented the secrets.h method, explain that here: "Create a secrets.h file in the same directory with #define WIFI_SSID "your_ssid" and #define WIFI_PASSWORD "your_password".")
6. Upload Code: Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.
7. Monitor Serial Output: Open the Serial Monitor (Tools > Serial Monitor) at 115200 baud. You should see the ESP32 connecting to WiFi and eventually displaying its assigned IP address.

Usage

1. Find IP Address: Note the IP address displayed in the Serial Monitor (e.g., 192.168.1.100).
2. Access Web Interface: Open a web browser on a device connected to the same local WiFi network as your ESP32.
3. Enter IP Address: In the browser's address bar, type the IP address you noted (e.g., http://192.168.1.100/) and press Enter.
4. View Readings: You should see a web page displaying the current temperature and humidity readings from your DHT11 sensor, which will auto-refresh every 5 seconds.

Code Explanation (Optional, but good for complex projects)

• Briefly explain key sections of your code, e.g., how the WiFi connection is established, how sensor data is read, and how the HTML is generated.

Contributing

Feel free to fork this repository, make improvements, and submit pull requests.

License

This project is licensed under the MIT License - see the LICENSE file for details.

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Disclaimer: This project is for educational purposes and basic monitoring. For critical applications, consider more robust sensor modules and data handling.