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    How do I convert BME680 gas resistance to IAQ ?

    Accepted Solution
    Community Moderator

    In BME680 datasheet, there are formulas to convert the raw data into temperature, pressure, relative humidity and gas resistance measurements. Where can I find the formula to convert gas resistance to Indoor Air Quality (IAQ) ?

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    Community Moderator
    Solution

    The BME680 sensors has 4 outputs: Temperature, relative humidity, abolute pressure, and gas resistance.

    Each of the 4 outputs requires a compensation using calibration parameters stored in the register map. Bosch Sensortec provides a the BME680 Sensor API in source code to make this compensation.

    IAQ, on the other hand, is not the output of the BME680 itself, but the output of a separate product called the Bosch Sensortec Environmental Cluster software (BSEC). This software provides a specific configuration for the BME680 sensor which has been tuned for sensing Indoor Air Quality (IAQ). This piece of software is provided as pre-compiled binary on Bosch Sensortec's website and is free to use with the BME680 sensor.

    !!Make sure to check that your processor architecture and compiler is supported. !!

    Due to the complex nature of the IAQ algorithm, it requires a significant amount of RAM and ROM, and uses floating point calculation. 8-bit and 16-bit platforms are not recommended.

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