BME688 Development board Communication protocol

[Phatta]

Hello,

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 ?

[Phatta]

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

[Wenator04]

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)
{
  Serial.begin(115200);
  Wire.begin(SDA, SCL);
  
  foodSensor.begin(BME68X_I2C_ADDR_HIGH, Wire);

[electro_bloom]

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.

[kgoveas]

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 (github.com) 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 (github.com)

Hope that helps,

Regards,

kgoveas

[kevinnortham]

Hi there

I wanted to know what communication protocol is being used as in SPI or I2C ? => Please look at :
https://www.bosch-sensortec.com/media/boschsensortec/downloads/product_flyer/bst-bme688-fl001.pdf

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