BME680: BSEC warning code: 100

[micha_pr]

I have tried to use two BME680 at ESP32 for compare the values for two identical sensors.

Using for each BME a seperate I2C bus.

If I try the BME680_basic_data_logging sample all is working fine, I get values from both sensors.

Using the BME680_config_state sample I will get for the second sensor the iaqSensor.status value "100" back.
Didn't found it in documentation / source code - what does this mean?

As explanation - I use an array for the sensors - maybe the bsec lib have any problems here with it?

Bsec iaqSensor[2];
...
iaqSensor[0].begin(BME680_I2C_ADDR_PRIMARY, I2Cone);
iaqSensor[1].begin(BME680_I2C_ADDR_PRIMARY, I2Ctwo);
...
void loop(void)
{ 
  if (iaqSensor[0].run()) {
  ...
  }
  if (iaqSensor[1].run()) {
  ...
  }
}

of course modified the functions:

checkIaqSensorStatus(int n)
updateState(int n)
loadState(int n)

So two questions:
- what does mean the errorcode 100
- is it possible to use the bsce lib with two sensors in one sketch?

Thanks!

Michael

EDIT: In the meantime I have seen that it seems not to be possible without major changes in lib to use 2 sensors with this samples.

[kgoveas]

Hi  michar_pr,

As you rightly pointed out, the low level libary is still a single instance. The internal algorithm is designed to support multi-instance, but future releases might expose those interfaces.

Regards,
kgoveas

[Bernd1]

Hi,

I am experiencing the same problem (2 BME680 on one I2C)

Are there any plans that this will be fixed soon?

regards

Bernd

[o_o]

Another user on this forum reports success with this pseudo-code:
https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/Multiple-BME680-devices-with-BSEC/m-p/10...

Until the BSEC library allows for multiple simultaneous instances, a workaround of using save/load state to switch a single instance of BSEC between multiple sensors by keeping multiple state files.

The same mechanism can also be used to run BSEC in a separate host (e.g. a cloud server running BSEC on thousands of IoT nodes), or to run BSEC from a log file (e.g. defer the processing of BSEC until AC power is available to conserve battery).

o_o

[Bernd1]

I nearly missed you answer. I was expecting the forum to send a mail if someone replies but I did not get a notification mail.

Meanwhile I found that current BSEC library on github has an example for 2 devices on a single I2C bus. With the information from here: https://forum.arduino.cc/index.php?topic=630059.0 (Post #3) I finally managed to run the multi example on an arduino mega.

Haven't looked at the example in detail yet, is it handling the states of the sensors to a single BSEC instance?

(Found the checkbox to send email of someone replies)