Cool project. I've done something similar using defunct crypto Awair AQI sensors tied into Home Assistant. They have an LED panel in the front that can show overall AQI or any of the pollutants they track: https://www.getawair.com/products/element
The sky is the limit as to what you can do with Home Assistant automations.
It's surprising how quickly a room with a closed door and one person can go from ~ambient CO2 levels to 1000ppm+.
> It's surprising how quickly a room with a closed door and one person can go from ~ambient CO2 levels to 1000ppm+.
Yeah, having seen myself how quickly it happens i've recently been thinking of finding automatic window openers that would respond to CO2 levels reported from either my aranet or on its own.
Maybe just get a heat recovery ventilator.
There is actually one in the house, but I'm not in a situation where I can install one in a specific room or upgrade the in/out flow in that room.
were you able to repurpose your Awair device? Mine has sat bricked since they discontinued supporting it. I'd love to use it for anything if you're able to point to any docs on how to make it useful again?