blinry on Nostr: Now that it's getting colder again, I feel motivated to resume work on my CO2 sensor ...

Now that it's getting colder again, I feel motivated to resume work on my CO2 sensor (an open-source Aranet 4 clone).

I improved the UI a bit, and added a "critical line" at 1000 ppm. The colors of the number also invert at that point, suggesting you to open your windows.