Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    BME688 BSEC2 IAQ calibration - How does it work?

    BME688 BSEC2 IAQ calibration - How does it work?

    amessner
    New Poster

    Hello,

    I'd like to understand how this auto-trimming algorithm works.

    I understand it is using the measurements of the past 4/28 days and it needs a range of "good" and "bad" air exposure, but what is the algorithm actually doing?

    Here is what I found in the official documentation:

    The IAQ scale ranges from 0 (clean air) to 500 (heavily polluted air). During operation, the algorithms automatically calibrate
    and adapt themselves to the typical environments where the sensor is operated (e.g., home, workplace, inside a car, etc.).
    This automatic background calibration ensures that users experience consistent IAQ performance. The calibration process
    considers the recent measurement history (typ. up to four days, configurable) to ensure that IAQ ~ 25 corresponds to “typical
    good” air and IAQ ~ 250 indicates “typical polluted” air.

    I hope its not just scaling based on best (IAQ25) and worst (IAQ250) measuremet seen?

    Thanks

    1 REPLY 1

    BSTRobin
    Community Moderator
    Community Moderator

    Hi amessner,

    The implementation of BSEC algorithm is not disclosed, and it is published in the form of library.

    Icon--AD-black-48x48Icon--address-consumer-data-black-48x48Icon--appointment-black-48x48Icon--back-left-black-48x48Icon--calendar-black-48x48Icon--center-alignedIcon--Checkbox-checkIcon--clock-black-48x48Icon--close-black-48x48Icon--compare-black-48x48Icon--confirmation-black-48x48Icon--dealer-details-black-48x48Icon--delete-black-48x48Icon--delivery-black-48x48Icon--down-black-48x48Icon--download-black-48x48Ic-OverlayAlertIcon--externallink-black-48x48Icon-Filledforward-right_adjustedIcon--grid-view-black-48x48IC_gd_Check-Circle170821_Icons_Community170823_Bosch_Icons170823_Bosch_Icons170821_Icons_CommunityIC-logout170821_Icons_Community170825_Bosch_Icons170821_Icons_CommunityIC-shopping-cart2170821_Icons_CommunityIC-upIC_UserIcon--imageIcon--info-i-black-48x48Icon--left-alignedIcon--Less-minimize-black-48x48Icon-FilledIcon--List-Check-grennIcon--List-Check-blackIcon--List-Cross-blackIcon--list-view-mobile-black-48x48Icon--list-view-black-48x48Icon--More-Maximize-black-48x48Icon--my-product-black-48x48Icon--newsletter-black-48x48Icon--payment-black-48x48Icon--print-black-48x48Icon--promotion-black-48x48Icon--registration-black-48x48Icon--Reset-black-48x48Icon--right-alignedshare-circle1Icon--share-black-48x48Icon--shopping-bag-black-48x48Icon-shopping-cartIcon--start-play-black-48x48Icon--store-locator-black-48x48Ic-OverlayAlertIcon--summary-black-48x48tumblrIcon-FilledvineIc-OverlayAlertwhishlist