nomarv

That sounds like a great-looking stand. Maybe you could send me a picture by email, you can find my address on my website. I’d love some inspiration. I also thought about 3D-printing a stand; I just need someone with experience in 3D design to create (or help me create) one, and someone who can print it.

I can’t really compare it to the Aranet4 because I don’t own one. But from what I can see, it offers similar functionality. In terms of hardware, though, the Aranet4 is more expensive than my setup. Of course, I also had to do some programming, which should probably be factored into the overall “cost” as well.

The accuracy of the Aranet4 is likely a bit better, at least based on the specifications I found (Aranet4: https://www.galaxus.ch/Files/6/6/1/0/2/6/6/2/Aranet4_datashe... , SCD40: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/d... ).

With my setup, I can also check the readings using my phone — currently only when I’m at home, since I host the stats website locally — but that’s enough for my needs.

I live in Switzerland — we normally don’t have air conditioners. At least not yet...

For my use case — simply getting some statistics about the air quality in our shared flat, improving concentration, and having a reminder to ventilate — the accuracy of the SCD40 is sufficient. It also has a self-calibration feature, which works as long as it is exposed to atmospheric CO₂ levels at least once a week. See the detailed specifications here: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/d...

Thanks, I created a new post: https://news.ycombinator.com/item?id=45962266 [Hi from Switzerland]

Made some changes to my blog, now the link above does not work anymore. Please use the following link: https://www.nicolin-dora.ch/blog/en-epaper-room-air-monitor-...

Thanks for your feedback. I just updated the blog with an English version. Please feel free to add any comments. English version: https://www.nicolin-dora.ch/blog/en-epaper-room-air-monitor-...

In der kalten Jahreszeit bleiben die Fenster oft geschlossen. Die Luft wird «dick»: Die Luftfeuchtigkeit steigt häufig über 60 %, was dem Wohlbefinden schaden und zu Schimmel führen kann. Gleichzeitig erhöht sich der CO₂-Gehalt in der Luft, was sich negativ auf die Konzentration auswirkt. Darum habe ich einen Raumluft-Monitor entwickelt, der so lange unauffällig bleibt, wie alles im grünen Bereich ist. Wird ein definierter Schwellenwert überschritten, wird er bewusst auffällig. Für meinen Bedarf an Statistiken visualisiere ich die Messwerte zusätzlich in einem übersichtlichen Dashboard.