Having a simple questions about the CCS811 function when it comes to modes about ccs811

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I also found another issue while running 2.0.1, when you change mode from Mode 3 to Mode 0, this somehow reset the baseline.

This is really odd , it does not say anywere in the documentation to save baseline before changing modes, we only switch between mode 0 and mode 3.

Any insight would be helpful

[maarten-pennings]

As the CCS811 datasheet explains, baseline management is described in AN000370. There you find your answer:

If multiple IAQ operating modes are used on the same sensor, the baseline should be stored for
each mode. The baseline is mode specific, it is therefore not possible to use the same baseline
value for all modes.

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@maarten-pennings

Thank you for responsing, so basically it does not store the baseline when going from Mode 3 to 0.
So we have to read,save, restore when switching between these modes.

On final question that might sounds silly, when staying is Mode 0..i assume it does not count as burn in ?
It would need to stay either mode 1-3 to be counted as burn in time right ?

Thanks buddy

[maarten-pennings]

You have to save the baseline per mode.

Burn-in is the process of stabilizing the sensor after manufacturing; the device needs to settle itself, getting used to the high temperatures of the heater. I would expect that only the amount of hours at high temperature matters (ie heater on), not in which mode this takes place (of course the modes differ in the time the heater is on).

[servercookie]

@maarten-pennings many thanks again for you help

We have started implementation of the save/restore baseline function as the documention tells us to do.
Thank you for clearing this up for us :)