Pi Temp and Humidity Sensor

A Flask-based IoT application for live monitoring of temperature and humidity using a DHT22 sensor on a Raspberry Pi. The application serves an HTML page that updates every 15 seconds via WebSockets to display the current temperature and humidity.

Features

• Real-time temperature and humidity updates using Flask-SocketIO.
• Optimized sensor reading to prevent overheating and ensure accurate measurements.
• Automatically detects and uses the server's IP address for client connections.

Installation

1. Install Adafruit_DHT library
   Follow the instructions at Adafruit_Python_DHT to install the library.

2. Install Python dependencies
   Run the following command to install the required Python packages:

   pip install -r requirements.txt

3. Run the application
   Start the application with:

   python main.py

How It Works

• The server reads data from the DHT22 sensor every 30 seconds to avoid overheating the sensor.
• The latest sensor data is broadcast to all connected clients every 15 seconds using WebSockets.
• The HTML page dynamically updates the displayed temperature and humidity values without requiring a page refresh.

File Structure

.
├── .gitignore
├── main.py                   # Main application script
├── README.md                 # Project documentation
├── requirements.txt          # Python dependencies
├── static/
│   ├── favicon.ico           # Favicon for the web page
├── templates/
│   ├── index.html            # HTML template for the web page

Notes

• Ensure the PYTHON_ENV environment variable is set to production when running on the Raspberry Pi to enable sensor readings. In other environments, random values will be used for testing.
• The server's IP address is automatically passed to the client, so no manual configuration is needed if the IP changes.

Troubleshooting

• If the sensor readings are incorrect or the application hangs, ensure the DHT22 sensor is connected properly and the Adafruit_DHT library is installed correctly.
• For development or testing, set PYTHON_ENV to any value other than production to simulate sensor readings with random values.

License

This project is licensed under the MIT License.