BME688 wrong temperatura and humidty

[josemartinez]

Hi,

I'm are using a BME688 in a project to read ambiental data with an ESP32. The problem is that temperature that is reading, the compensated one, is over 3 degrees up than the real and humidity is like a 60% lower. CO2 levels seems to be unrealistic too.

To try this sensor, I'm using the example "basic_config_state.ino" of arduino library available in GitHub, "BSEC-Arduino-library". With "config/generic_33v_3s_4d/bsec_iaq.txt" configuration.

I tried to use an offset of 3 degrees to try to compensate it and it seems to improve something. But still exits some error:

BME688

AQM

Date

Time

Tº	H%	CO2	Tº	H%	CO2
24,8	45,7	1334	26	46	704	13/09/2022	14:41
28,4	51,1	642	31	47	617	13/09/2022	8:13
25,7	39,4	2180	27	41	941	13/09/2022	11:02
25,2	38,7	2159	27	42	1342	13/09/2022	13:55
27,8	53,1	654	30	53	550	14/09/2022	9:04
25,4	47,1	1754	27	48	725	14/09/2022	11:00
24,7	38,4	1923	26	43	1219	15/08/2022	9:33

I'm going to capture more data and update this post with it.

Do you now what is going on? There is a problem with the current configutation? Could you provide me some example to configurate it correctly?

Thanks.

[BSTRobin]

Hi josemartinez,

Timestamp unit is ns in the code. From your printed information, the timestamp is abnormal.
int64_t time_stamp; /*!< @brief Time stamp in nanosecond resolution as provided as input [ns] */