DDCO₂

DDCO₂ takes carbon dioxide and temperature readings from a CO₂Mini USB sensor (RAD-0301) and writes them to StatsD.

It acts as a very simple bridge between ex_co2_mini (for reading from the device) and statix (for writing to StatsD).

Although designed and tested on Datadog, in theory, it should work fine on any StatsD server.

Installing

1. Plug in the USB device to a Linux server.
   • Other OSes are not currently supported by ExCO₂Mini.
2. Get the corresponding /dev/hidraw* device set up.
   • You'll want it readable by the user you intend to monitor as.
   • See "Device Setup" from the ExCO₂Mini README for details.
3. Install Elixir.
4. Use git to clone this project somewhere. (Change directory to that location.)
5. Copy config/config.example.exs to config/config.exs and change values as needed.
6. Run mix deps.get.
7. Run mix compile.

Running

You have two options on how to run DDCO₂:

• To get started, you can just run mix ddco2. This will launch DDCO₂ right here and now, and begin logging results.
  • To exit, press control-C twice.
• If you're an experienced Elixir developer and/or sysadmin, and you want more flexibility, you can try deploying instead.
  • This is covered in a separate document.

Legal stuff

Copyright © 2019, Adrian Irving-Beer.

DDCO₂ is released under the Apache 2 License and is provided with no warranty. This program is aimed at hobbyists and home enthusiasts, and should be used in non-life-critical situations only.