Recurse Center CO2 Monitor

Installation

This makes use of the Python co2meter library available on github and pypi. I've only tested this on an Ubuntu 18.04 machine so other operating systems may have different setup instructions.

To get set up you will need to install a few packages:

$ sudo apt-get install libusb-1.0-0-dev libudev-dev
$ sudo pip install hidapi co2meter

You can additionally install pandas if you want to get the data as a pandas dataframes.

On linux you will also need to set rules for the device interface. Add the following content to a file named /etc/udev/rules.d/98-co2mon.rules:

SUBSYSTEM=="usb", ATTRS{idVendor}=="04d9", ATTRS{idProduct}=="a052", GROUP="plugdev", MODE="0666"
KERNEL=="hidraw*", ATTRS{idVendor}=="04d9", ATTRS{idProduct}=="a052", GROUP="plugdev", MODE="0666"

And then reload the udev rules:

$ sudo udevadm control --reload-rules && udevadm trigger

To check that everything is working, do the following:

$ sudo python -c "import co2meter as co2;mon = co2.CO2monitor();print(mon.info)"

Assuming everything is working correctly, you should see output like this:

{'product_name': u'USB-zyTemp', 'vendor_id': 1241, 'serial_no': u'1.40', 'product_id': 41042, 'manufacturer': u'Holtek'}

Note that I'm using a CO2 meter from co2meter.com, specifically this one.

Starting the liveplotter

You can generate a running stream of measurements (one a minute by default) and a liveplot by doing

$ sudo python3 gather_data.py

To serve the liveplot on a webpage via flask, do:

$ cd webapp
$ export FLASK_APP=webapp.py
$ flask run --host=0.0.0.0