8GB and Docker, plus a "cloud" server, seems a bit much.
I run a Luftdaten module myself (with SDS011 particulate sensor), but with no government meteorological station next to me, I don't really have a reference point. All I can say is that this SDS011 spews out some numbers, and when testing indoors those numbers got higher when I turned on my air humidifier. I have a similar concern about DHT11/DHT22 - it's a random small box I got mail-ordered from China, which purports to tell the temperature and humidity of air. But again, those are two arbitrary numbers I don't have anything to calibrate again.
Just using these sensors and trusting the results is an accepted practice in DIY electronics community. But I keep wondering - are those sensors actually calibrated, or it's that people don't really care if they get garbage results?
(Related, it's also my number one complaint against a particular air quality startup in my country. They rent out air sensors which you can't inspect (there are contractual penalties involved), and they happily market their map as a vital tool for air quality, but nobody really knows what sensors they're using, and they don't even bother to put error bars on the values they show. I mean, I thought including measurement error is how adults behave.)
I recently upgraded to double glazed windows in half the house, including all the bedrooms, and put a heat pump in each of the two used bedrooms. So I want to keep the windows closed for heat retention, but also want to keep them slightly open to reduce CO2 build up.
I sleep in my small bedroom with my two 16kg dogs, so it seems reason the CO2 level may rise to suboptimal during the night if the window is shut.
What I would like to do is make a DIY ventilation system that can move fresh, HEPA filtered, air from outside, in to the room.
Or am I over complicating things? Could I just use a small fan, something sized to replace, say, half the volume of the room every few hours, and just leave it constantly on? Or should I put a larger fan on a timer so it runs for a few minutes every hour?
Does any of this really matter?
Edit to add: any good resources to lose myself down a rabbit hole?