There have been a few updates to the Project:

October 2020: 

The Dice has been tested in a classroom environment with very positive results. The limits set did work with the large classroom and about 25 students, the CO2 levels rose until the Dice signalled a 'fresh air required' situation. Windows were opened for 5 minutes and the CO2 Level dropped to acceptable levels.  A small classroom with a working group of 10 never reached unacceptable levels, as it had a ventilation system. Still the Dice did signal elevated levels, and the room was aired out, and subsequently ok to use. Both the desk stand and wall mount were tested. Both worked fine showing the same CO2 levels.

A code update was posted, and missing files were added to the git repo.

November 2020: 

Several tests were conducted to verify that the dice itself generates enough flow of air around the dice. Oddly, the documentation from the sensor supplier is only available as a draft ( funny!) document. It was verified that the sensor does indeed get a very good sniff of the air. There will be no closed housings for the dice, as this might impact the air flow.

A test was performed using the WiFi capabilities of the micro-controller to verify that the signal does not interfere with the sensor, or that the PCB board messes with the reception of the controller antenna. Both results are fine. The boards will not receive copper pour on the front or back, as that significantly lowers the WiFi performance.