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    BME688 Development board Communication protocol

    BME688 Development board Communication protocol



    I just recently bought a BME688 Development kit. As of now, there is no much information on how the Adafruit HUZZAH32 feather board communicates with the BM688 sensors ( total 8).  
    I wanted to know what communication protocol is being used as in SPI or I2C ?. Can operate with just one bme sensor being enabled?
    Or can I use the sensor api to develop custom firmware ?

    14 REPLIES 14

    Also If there is a schematic of the BME688 board available? Would have made things much simpler to understand. 

    Hi kgoveas,

    I also met some difficulties on BME688 Development board Communication protocol recently. And it's quite helpful to see this reply.

    But I am still struggling with the issue after I got the details. Here are my codes. Would you mind giving me more hints please? 

    Thank you!

    #include "Wire.h"
    #define SDA 23
    #define SCL 22
    void setup(void)
      Wire.begin(SDA, SCL);
      foodSensor.begin(BME68X_I2C_ADDR_HIGH, Wire);



    Hello all ,

    I would like to know if anyone was able to communicate with the Bosch BME688 kit sucessfully with custom built firmware ? I would like to know which pins of I2C expanders are used as CS select for interfacing each sensor with the controller.

    Hi electro_bloom,

    Have you already seen the samples from Github? 

    Bosch-BSEC2-Library/examples/x8_board_examples/basic at master · BoschSensortec/Bosch-BSEC2-Library ...

    There is a mini library called CommMux Bosch-BSEC2-Library/commMux.cpp at master · BoschSensortec/Bosch-BSEC2-Library ( that abstracts the use of the IO expander to control the 8 sensors.

    The use of the library can be seen here : Bosch-BSEC2-Library/basic.ino at master · BoschSensortec/Bosch-BSEC2-Library (

    Hope that helps,



    Hi there

    I wanted to know what communication protocol is being used as in SPI or I2C ? => Please look at :

    it will help you to find your answer. Picture attached / Diagram: