Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    BME688 wrong temperatura and humidty

    josemartinez
    Member

    BME688 wrong temperatura and humidty

    Hi,

    I'm are using a BME688 in a project to read ambiental data with an ESP32. The problem is that temperature that is reading, the compensated one, is over 3 degrees up than the real and humidity is like a 60% lower. CO2 levels seems to be unrealistic too.

    To try this sensor, I'm using the example "basic_config_state.ino" of arduino library available in GitHub, "BSEC-Arduino-library". With "config/generic_33v_3s_4d/bsec_iaq.txt" configuration.

    I tried to use an offset of 3 degrees to try to compensate it and it seems to improve something. But still exits some error:

    BME688AQMDateTime
    H%CO2H%CO2  
    24,845,71334264670413/09/202214:41
    28,451,1642314761713/09/20228:13
    25,739,42180274194113/09/202211:02
    25,238,721592742134213/09/202213:55
    27,853,1654305355014/09/20229:04
    25,447,11754274872514/09/202211:00
    24,738,419232643121915/08/20229:33

     

    I'm going to capture more data and update this post with it.

    Do you now what is going on? There is a problem with the current configutation? Could you provide me some example to configurate it correctly?

    Thanks.

    10 REPLIES 10
    ilcnet
    Established Member

    Re: BME688 wrong temperatura and humidty

    I have same problem with Bme688, i used Bme688 and Scd41 at the same time and place unfortunately the Bme688 show me 26 C and Scd41 shows 22 C
    ilcnet
    Established Member

    Re: BME688 wrong temperatura and humidty

    Can you give me your used code for esp32, i can't receive co2 value
    josemartinez
    Member

    Re: BME688 wrong temperatura and humidty

    Hello ilcnet,

    I've used the code available in BoshSensortec's GitHub: https://github.com/BoschSensortec/BSEC-Arduino-library/blob/master/examples/basic_config_state/basic...

    Just edit it and add "BSEC_OUTPUT_CO2_EQUIVALENT" into sensor list:

    josemartinez_1-1663247009916.png

    Hope it helps.

     

    ilcnet
    Established Member

    Re: BME688 wrong temperatura and humidty

    Thank you for your response so after adding this, with witch of method i can call co2 value, and my esp32 with this code gives bsec error -2 that sensor is not found,i changed primary add to secondary add in this code and there is no programing error.
    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