Questions about BME688 Calibration

[Ahmed-NCD]

Hey,

We need to understand more about calibration and how it works
As per documentations, it runs automatically after 4/28 days. So let's say sensor is kept in a polluted room for 4 days, how will sensor deal with this if there's no pollution in day5? 
And one more thing, it's mentioned that sensor is calibrated if IAQ accuracy is <= 1 and sensor is exposed to clean/polluted air for 30 mins. does that mean at bootup we've to wait for 30 mins before using it? or should we only care about IAQ accuracy? If we kept it in a normal environment, will it be able to be calibrated if it's still there for 30 mins and IAQ is <=1? Or there should be a variation on air quality?

[Ahmed-NCD]

One more question. Do we need to retain timestamp value across resets? or it can be resetted?

[BSTRobin]

Hi alextingle,

Users can choose a 4 day or 28 day calibration configuration, but the calibration time does not support automatic switching. Please refer to the configuration description on the integration document:

The reference value for calibration completion is 4 days or 28 days, not 30 minutes.
You need to refer to the value of accuracy, and the IAQ value is most accurate when it reaches 3.

Before resetting, only the state needs to be saved, no timestamp needs to be saved.

[Ahmed-NCD]

But what about 30 mins mentioned here