[flgr]

There's also software to read the measurements it makesover USB, but I haven't personally used that: https://github.com/huhamhire/co2-monitor-exporter

[flgr]

Looks like the underlying logic came from this blog series, which made me originally buy that particular device: https://hackaday.io/project/5301-reverse-engineering-a-low-c... :)