Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    BME680: Accuracy returns 1

    BME680: Accuracy returns 1

    Darius_m31
    New Poster

    Hello,

    we observe in several cases that accuracy 3 is reached and IAQ is reported (for hours or days) but suddenly accuracy returns 1. A IAQ variation seems necessary to return to accuracy=2 and then 3.

    Is it an expected behaviour?

    Is there a way to avoid or reduce this behaviour?

    Thanks

     

    2 REPLIES 2

    o_o
    Contributor

    Hi Darius,

     

    The accuracy indicator on a scale of 0-3 is an artifact of Google's Android API definition.

    https://developer.android.com/reference/android/hardware/SensorManager.html#SENSOR_STATUS_ACCURACY_H...

    For BSEC the meaning is slightly different. It is akin to a calibration status. There a multiple other threads on this forum describing it in more details, but the short answer is that it is expected to periodically drop to 2/3, but 1/3 means that the input data does not fluctuate very much. You can increase the time constant from 4 days to 28 days in this case. (by changing your config string)

     

    o_o

    Thanks for the information,

     

    however, we observe accuracy 1 even if the VOC is varying.

    Placing 2 devices in the same position, we have observed that:

    - in one device VOC raises from 25 to 200 (in 4-5 hours) keeping accuracy at 3;

    - while in the other device the initial value is the same, but we have 2-3 hours of accuracy=1 and eventually accuracy gets 3 with VOC aligned to the other device.

     

    Regards,

     

    Dario

    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