BME688 Compensated Temperature

[HUYNHIEN]

Hi everyone,

I want to measure temperature and recognise gas simultaneously with "basic_config_state.ino"in Bosch-BSEC2-Library-master. I have a problem here with the temperature value.It has big difference between the compensated temperature's value and real temperature which be measured by a thermometer.

(When I used "basic.ino" program which does not recognise gas, the temperature is almost the same with the thermometer's value.)

Could you please tell me how I can get the compensated temperature's value correctly when the sensor can recognise the gas simultaneously ?

Many thanks.

[BSTRobin]

Hi HUYNHIEN,

I mean the bme68x.c file you used.

You could download BSEC 2.x Software from https://www.bosch-sensortec.com/software-tools/software/bme688-software/ and test "BSEC_2.0.6.1_Generic_Release_04302021\examples\bsec2\examples\basic_config_state".
If you also have same temperature difference, then we will check it.

[Minhwan]

Hi HUYNHIEN, 

We do have some temp offset due to self heating. 

Technically, you should put offset value using BSEC_INPUT_HEATSOURCE, but some version you should put it manually after you get some temp data. 

We already recognized the issue and will release fixed version later. 

Thanks, 

[HUYNHIEN]

Hi BSTRobin,

Thank for your reply.

I'm using  "...\Bosch-BSEC2-Library-master\examples\generic_examples\basic_config_state\basic_config_state.ino for my test.
I'll try your recommended file soon. 

Best regards. 

[HUYNHIEN]

Hi Minhwan,

Thank for your reply.

I'll try your recommendation about put offset value. 

Best regard.