BME688 how to handle the event that BSEC bsec_do_steps return 5

[brianchen]

Hi,

I'm using BSEC v2.4.0 with BME 688 on ARM m4 SoC. The system enables BME 688 scan mode with heat profile generated by AI studio. 

It often sees bsec_do_steps() function return 5, i.e. Gas index not provided to bsec_do_steps() from log messages. Usually 1-2 times per hour.

I don't see any problem from the input data of bsec_do_steps(). When this happens, I need to re-init the BSEC and sensors by calling bsec_iot_init(), otherwise it cannot retrun to normal state.

The problem is when I reinitialzie the BSEC lib, the gas estimation will unstable for 1-2 min. The data shows peak. I can hide this for 2 min but seems not a good idea.

Any suggestionon this issue? How to avoid bsec_do_steps() return error? Thank!

[BSTRobin]

Hi brianchen,

Thanks for your inquiry.
I upload BSEC2.4.0.0 example code on STM32 for your reference.
You can refer to the following macro definitions to enable the function of gas scanning.
In user_define.h, enable macro definitions like this:
#define BME68X_OUTPUT_GAS_ESTIMATE
//#define BME68X_OUTPUT_GAS_IAQ