The https://operame.nl/Operame project made some designs/kits for CO² monitoring (in dutch classrooms). While this is mostly a DIY thing, assembly was really easy, and there were some volunteers even pre-assembling kits for third parties.
I have 2 of these sensors myself, and they report over mqtt (local), and I've connected them to homeassistant for live insight and possibly triggeging other events based on CO² levels.
The Operame project is currently on hold, but all designs/code are open and free to use.
I have 2 of these sensors myself, and they report over mqtt (local), and I've connected them to homeassistant for live insight and possibly triggeging other events based on CO² levels.
The Operame project is currently on hold, but all designs/code are open and free to use.