CCS811 measurements lack baseline

[viric]

In general TVOC sensors require a baseline of "clean air" (outside for some minutes) to set the baseline for the measurements - that's what I learnt from other sensors. Some simply regularly update the baseline to the cleanest they can find but that does not produce stable results along time either.

Here there is a "TODO" about that. https://github.com/fablabbcn/smartcitizen-kit-21/blob/master/sam/src/SckUrban.h#L220

The datasheet of the CCS811 also says that CO2 measurements come at most after 1h of turning on; it mentions something about the earlier 48h of running that I don't completely understand.

What is the staus of any ongoing work to make better CCS811 measurements? For the sensors I see deployed their numbers don't make any sense.

I can try some experiments with the baseline (maybe through serial interface operation) to make it work better. I will read more carefully the spec.

[viric]

AH I just saw the baseline is read on Reset and saved to the eeprom config for next boots. I will use that and see.