Hi,
In the integration guide we released with generic release package, such parameters are explained on Page 7:
The history BSEC considers for the automatic background calibration of the IAQ in days. That means changes in this time period will influence the IAQ value. · 4days, means BSEC will consider the last 4 days of operation for the automatic background calibration. · 28days, means BSEC will consider the last 28 days of operation for the automatic background calibration.
How to understand background calibration?
When BME680 found better/worse gas than before, the accuracy would be 2 and it means our sensor is in calibration. Then after calibration finished, the accuracy comes to 3.
From that moment, sensor is into background calibration. If you chose 4 days (28 days) as the time for background calibration, after 4 days (28 days) without any better/worse gas, the accuracy comes to 1 and this means BME680 needs gas trigger for calibration.
Best regards.
... View more