Bosch Sensortec Community

    Precision of BME680

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    New Poster

    Re: Precision of BME680

    Thank you,

    The sensor acquires every about 3 seconds (is working in low power mode). I have modified only the logger that now registers data only every 1 minute in order to avoid too many data to be manged by excel, above all while since I've been working for many days. 

    So should I consider the data acquired as correct? 

    Thanks,

    Cristian

     

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    New Poster

    Re: Precision of BME680

    I'm asking this because a value of 4000 for the VOC is very big, and I see that if I put different sensors one near the other they give different values sometime. Is this connected to a mistake in the way I use the library? 

    Thanks,

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    Community Moderator

    Re: Precision of BME680

    the output accuracy level from your data log towards your final result is not consistent. 

    So i will not say the data accqusition is correct.

    Also where did you get 4000 for the VOC value?  the bVOC?  In my simulation result,  i don't see such big value with your input data. 

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    New Poster

    Re: Precision of BME680

    Thanks,

    The VOC Value is the BVOCeq multiplied by 1000.

    This is because I want to report an integer value(the ppb is in part per billion) not ppm (part per milion) reported by the VOC

    Thanks,

     

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    New Poster

    Re: Precision of BME680

    I found one error, that is the BME680 is actually supplied with 3.3V while from the BSEC integration Guide it appears that by default the configuration of the BME680 is set to "generic_18V_300s_4d". Now I have set the configuration to "generic_33v_3s_4d". Now I have correct the mistake. Let's see if the behaviour now is better... I'll give a new plot once I have registered it.

    Thanks,

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