I have quit because

a) I found out that the sensor doesn't return PPM values, and that it isn't really reliable to get it to do so
b) I didn't understand the table on the datasheet
c) Wemos wifi problems (the code worked once, then I changed it and lost the code)

The wifi coding was also extremely frustrating through the wemos. I am learning python now, and maybe will learn how to use it with wifi through a wifi dongle on my computer, then see if I can port that code to the wemos, with a different sensor.

Andreas Speiss has some videos about that (Python on wemos), which I will refer to.

I quit early last year, am only updating now though. Sorry if you have been following this project, though I don't think anyone has been.