DHT22 Monitoring with ESP32

This project demonstrates how to use an ESP32 to monitor temperature and humidity using a DHT22 sensor and display the data on a web interface. The ESP32 serves as a web server, providing real-time updates of sensor readings.

Features

• Wi-Fi Connectivity: Connects to a Wi-Fi network to serve the web interface.
• DHT22 Sensor Integration: Reads temperature and humidity data from the DHT22 sensor.
• Web Interface: Displays real-time temperature and humidity data on a webpage.
• LED Control: Blinks an LED with a frequency based on the temperature reading.

Requirements

• ESP32 board
• DHT22 sensor
• LED
• Resistors and wires for connections

Libraries Used

• WiFi.h: For Wi-Fi connectivity.
• AsyncTCP.h: For asynchronous TCP communication.
• ESPAsyncWebServer.h: For creating the web server.
• DHT.h and Adafruit_Sensor.h: For interfacing with the DHT22 sensor.

Pin Configuration

• DHT Sensor Pin: Connected to GPIO 25.
• LED Pin: Connected to GPIO 2.

Setup Instructions

1. Install Libraries:

   • Install the required libraries (ESPAsyncWebServer, AsyncTCP, DHT) in your Arduino IDE.

2. Configure Wi-Fi:

   • Replace SSID_WIFI and WIFI_PASSWORD with your Wi-Fi credentials in the code.

3. Upload Code:

   • Upload the provided code to your ESP32 using the Arduino IDE.

4. Connect Hardware:

   • Connect the DHT22 sensor to GPIO 25 and the LED to GPIO 2.

5. Access Web Interface:

   • After uploading the code, open the Serial Monitor to find the ESP32's IP address.
   • Open a browser and navigate to the IP address to view the web interface.

How It Works

• The ESP32 reads temperature and humidity data from the DHT22 sensor every 2 seconds.
• The data is served via a web interface, which updates every 2 seconds using JavaScript.
• The LED blinks with a frequency based on the temperature reading.

Notes

• Ensure the DHT22 sensor is properly connected and powered.
• The LED blinking frequency is mapped to the temperature range (15°C to 40°C).

License

This project is MIT.