My job on this project was creating the Web-facing parts of the system, the product was build by others. (also note that the emco2-page is written in german)
The aim of the project was to provide cheap, reliable and easy to build CO2 warning systems for classroom use. We started the project because commercial solutions would have been very expensive or not available.
While others were hard at work soldering components and writing Arduino-code, I had the least productiv job: writing the project webpage.
It's not a good looking page by any means, but it does th job well enough for it's usercase.
The page is written using the JAM stack. The articles are provided as Markdown (.md) files and rendered into a template using EJS with a few helper-functions.