CO2 Station: Conclusion

To summarise this project, let’s make a list of features, as I did with my previous projects:

• High-accuracy CO₂, temperature, and relative humidity sensors
• High-resolution, low-power 3.7″ E-Paper display
• Built-in clock and calendar
• Configuration and charging over USB
• Two user buttons and status LED for easy interaction and self-calibration
• Configurable timed standby mode
• Very long battery runtime between charges (up to multiple weeks)

In short, I achieved or exceeded all of the goals I set for this project – it was a complete success.
And in addition to that, it taught me a lot about low-power designs, EPD technology, sensor technology, and building smaller devices.

I’ve been using the CO₂ station ever since, having a dedicated spot for it under one of my monitors, so that it’s always in view.
I especially love how it ended up being a “set and forget” device most of the time – all it needs is an occasional charge and clock adjustment (about once every 3-4 weeks, with my settings and 8 hours of standby per day), as well as a quick calibration in outside air once every 3 weeks.

What doesn’t feel great is having to continuously increase the calibration reference value over time, as the atmosphere’s CO₂ concentration rises…

So in conclusion, I am extremely happy with this project. This was the first time I completed a project and didn’t have the feeling that it was lacking something (compared to my initial imagination of it).
Even multiple years later, at the time of writing, I feel like there aren’t too many things I’d change if I were to design another CO₂ Station now.

Thanks for reading, and until next time!