This is a MH-Z19B, CO2 sensor, a DHT22, humidity and temperature sensor; connected at a nodemcu with a oled screen.
It have a interface web and an update by http interface. It is possible to connect it in Modbus.
You can found more information on my web site on this page
I share also the drawing, the pcb, and the box designe in this repository.
Fork it Create your feature branch (git checkout -b my-new-feature) Commit your changes (git commit -am 'Add some feature') Push to the branch (git push origin my-new-feature) Create new Pull Request