A small, but still not simple project, which turned out very well in my opinion: In 2021, I built a small, portable air quality sensor station, featuring a CO2 sensor, as well as temperature and humidity measurement, and an E-Paper display. The main goals here were compactness and battery runtime – with my usage parameters, it lasts almost a month without recharging.
For optimal looks, the wooden case is CNC-machined and hand-finished. The electronics are, as always, hand-made.
When I have the time, I will, of course, create a full series of documentation posts about this project. Until then, enjoy the pictures!