A live-feed of me dying in my apartment from heat.
https://watchmemelt.bisonopolis.de/

Original source for reading the CO2-Monitor AIRCO2NTROL MINI 31.5006 device: https://hackaday.io/project/5301/logs?sort=oldest

I kept the python3 translation of the original code and some simple scripts here for reference for myself and anyone who would wants to build something with this and getting an easy and modifiable starting point.

usb-devices | grep -B4 -A4 USB-zyTemp

P:  Vendor=04d9 ProdID=a052 Rev=01.00
S:  Manufacturer=Holtek
S:  Product=USB-zyTemp

udevadm info --query=property --name=/dev/hidraw4

DEVPATH=/devices/pci0000:00/0000:00:08.1/0000:c5:00.3/usb1/1-2/1-2.1/1-2.1:1.0/>
DEVNAME=/dev/hidraw4
MAJOR=241
MINOR=4
SUBSYSTEM=hidraw
USEC_INITIALIZED=1733790499
ID_VENDOR_FROM_DATABASE=Holtek Semiconductor, Inc.
ID_MODEL_FROM_DATABASE=USB-zyTemp

• Any Linux computer with python3
• A webserver with PHP
• A URL / subdomain

The CO2-Monitor AIRCO2NTROL MINI 31.5006 | TFA Dostmann

• https://www.tfa-dostmann.de/produkt/co2-monitor-airco2ntrol-mini-31-5006/
• Amazon Affiliate Link: https://amzn.to/44zvPGj
  • As an Amazon Associate I earn from qualifying purchases.

Note: Not setting the DEVICE_PATH in conf_local.py will result in auto-detecting the device path, which still needs the rw (read/write) rights to be set, but it will show you the path if it can be detected, making the manual guesswork superfluous.

This may differ from system to system, but what worked for me (Ubuntu 24.04):

• run ll -l /dev/hidraw*
  • look fot the highest number of hidraw, eg /dev/hidraw22
    • if there is no hidraw device, it's fine too
• plugin the CO2-Monitor AIRCO2NTROL MINI
• run ll -l /dev/hidraw* again
• the now highest number of hidraw devices is the CO2-Monitor
• run sudo chmod o+rw /dev/hidrawNUMBER for your device (replace NUMBER with the number you observed before)

Note: sudo chmod o+rw /dev/hidrawNUMBER has to be run after every reboot, there are multiple ways to make it permanent, one is at the bottom of the original post https://hackaday.io/project/5301/logs?sort=oldest.

You can just fill in the variable in the conf-files directly, but that would make updating hard, so it's recommended to male local configs as following:

Client:
Copy conf.py to conf_local.py and fill out the variables.

Server:
Copy web/conf.php to web/conf_local.php and fill out the variables.

Copy the web folder to your server.
It has to be reachable from a root-path, eg: https://watchmemelt.bisonopolis.de/

Run monitorPoster.py.