Raspberry Pi Weather Monitoring System

This project showcases a weather monitoring system using Raspberry Pi 2 with DHT11/DHT22 and AHT20/BMP280 sensors. The collected data is displayed in Grafana through InfluxDB for real-time weather visualization.

Features

1. Sensor Data Collection:

   • Reads data from DHT11/DHT22 and AHT20/BMP280 sensors using C programs and the wiringPi library.
   • Supports indoor (garage) and outdoor data collection.

2. Line Protocol Integration:

   • Outputs data in InfluxDB's line protocol format, making it compatible with Telegraf for seamless ingestion.

3. Time-Series Data Storage:

   • Utilizes InfluxDB for storing time-series weather data.

4. Visualization with Grafana:

   • Displays real-time weather dashboards using InfluxDB as a data source.

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System Requirements

• Hardware:

  • Raspberry Pi with GPIO pins
  • DHT11 or DHT22 sensor
  • AHT20 or BMP280 sensor

• Software:

  • wiringPi C library
  • Telegraf
  • InfluxDB
  • Grafana

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Getting Started

1. Compiling the C Programs

Ensure that the wiringPi library is installed before compiling.

Run the following commands to compile the sensor scripts:

gcc aht20+bmp280.c -o aht20+bmp280 -l wiringPi
gcc dht11+22.c -o dht11+22 -l wiringPi

2. Configuring Telegraf

Set up Telegraf to collect sensor data and send it to InfluxDB. Below is an example configuration:

[[inputs.exec]]
   commands = [
     "/etc/telegraf/scripts/dht11+22 -dhtpin 15 -sensor dht22",
     "/etc/telegraf/scripts/dht11+22 -dhtpin 3 -sensor dht22",
     "/etc/telegraf/scripts/aht20+bmp280 -sensor bmp280"
   ]
   timeout = "30s"
   data_format = "influx"

Refer to the official documentation for setting up Telegraf and InfluxDB:

• InfluxDB Documentation
• Telegraf Documentation

3. Configuring Grafana

1. In Grafana, go to Dashboards > New > Import Dashboard.
2. Import the dashboard JSON file provided in the project directory.
3. Connect Grafana to your InfluxDB instance as a data source.

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Project Architecture

flowchart TD;
    A[Hardware sensors]-->B[C Programs **wiringPi**];
    B-->C[Telegraf agent];
    C-->D[InfluxDB time series database];
    D-->E[Grafana dashboards];

Loading

1. Sensors: DHT11/DHT22 and AHT20/BMP280 measure temperature, humidity, and pressure.
2. C Programs: Fetch data from sensors and format it for Telegraf.
3. Telegraf: Collects and sends data to InfluxDB.
4. InfluxDB: Stores time-series weather data.
5. Grafana: Visualizes the data on a customizable dashboard.

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Example Output

Here is an example of the data output in InfluxDB's line protocol format:

Weather,host=stork,pinnum=15,sensor_type_name=dht22 humidity=72.9,temperature=10.0
Weather,host=stork,pinnum=3,sensor_type_name=dht22 humidity=51.1,temperature=17.2
Weather,host=stork,sensor_type_name=bmp280 pressure=1009,temperature=18.4

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Screenshot

Below is a screenshot of the Grafana dashboard showing the final visualization:

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Future Improvements

• Add support for additional sensors.

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License

This project is licensed under the Apache License.

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Contributions

Contributions are welcome! Please feel free to submit pull requests or file issues for improvements.

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Acknowledgments

• wiringPi Library
• InfluxData
• Grafana