Reading multiple BME688 with Bsec2

[hugehead]

Hello,

I would like to readout multiple BME688 simultaniously. I created two instances of Bsec2, and afterwards i do each step for both instances. I kept the NewDataCallback the same, as one input parameter is the BSEC instance. In BSEC2 i get an error 100 from BSEC2.

Please let me know what is the problem .

Bsec2 envSensors[2];

   for(int i = 0; i < NUMBEROFDEVICES; i ++)
      {
          

          //Set multiplexer

          if (!envSensors[i].begin(BME68X_I2C_ADDR_LOW, Wire))
          {
              checkBsecStatus(envSensors[i]);
          }
      
          /* Subsribe to the desired BSEC2 outputs */
          if (!envSensors[i].updateSubscription(sensorList, ARRAY_LEN(sensorList), BSEC_SAMPLE_RATE_LP))
          {
              checkBsecStatus(envSensors[i]);
          }
          
          /* Whenever new data is available call the newDataCallback function */
          envSensors[i].attachCallback(newDataCallback);
          envSensors[i].index = i;
          Serial.println("BSEC library version " + \
            String(envSensors[i].version.major) + "." \
            + String(envSensors[i].version.minor) + "." \
            + String(envSensors[i].version.major_bugfix) + "." \
            + String(envSensors[i].version.minor_bugfix));
            
      }


}

if (!envSensors[i].begin(BME68X_I2C_ADDR_LOW, Wire))
{
checkBsecStatus(envSensors[i]);
}

I checked the Arduino example for x8 board, which has 8 times BME688 and Multiplexer. It seems like the example is reading and processing only 1 BME688 sensor.

Kind Regards

[BSTRobin]

Hello hugehead,

You could refer this example code on github: https://github.com/BoschSensortec/BSEC-Arduino-library/blob/master/examples/basic_config_state_multi...

[hugehead]

Hello Robin,

the example is from BSEC(v1), i am using BSEC V2 right now. Which - iguess - is the most recent, right? I am running on MKRZero right now, using the basic example without writing to the EEPROM. It seems that the example above is for BME680, not for BME688.

I have attached 2x BME688 Pi3g dev board (ADDR HIGH, ADDR LOW), this example works different and has the newDataCallback. can assume from the output that sometimes it reads sensor 1 and sometimes sensor 2 (because of different "Gas resistance") but the values are coming irregularly. I assume it should come every ~3 seconds.

Additionally, i get warning 100, which is relate to timing from your precompiled library? Output is below and attached my example code.

• Can I run multiple different sensors on the BSEC2? What do I need to do?

14:16:51.072 -> BSEC library version 2.0.6.1
14:16:51.072 -> BSEC library version 2.0.6.1
14:16:51.141 -> BSEC warning code : 100
14:16:54.102 -> BSEC outputs:
14:16:54.102 -> 	timestamp = 3875
14:16:54.102 -> 	iaq = 25.00
14:16:54.102 -> 	iaq accuracy = 0
14:16:54.102 -> 	temperature = 22.49
14:16:54.102 -> 	pressure = 99600.37
14:16:54.102 -> 	humidity = 42.72
14:16:54.102 -> 	gas resistance = 5684.85
14:16:54.102 -> 	stabilization status = 1.00
14:16:54.102 -> 	run in status = 0.00
14:16:54.102 -> BSEC warning code : 100
14:16:57.072 -> BSEC outputs:
14:16:57.072 -> 	timestamp = 6875
14:16:57.072 -> 	iaq = 25.00
14:16:57.072 -> 	iaq accuracy = 0
14:16:57.072 -> 	temperature = 22.60
14:16:57.072 -> 	pressure = 99604.23
14:16:57.106 -> 	humidity = 42.71
14:16:57.106 -> 	gas resistance = 5684.85
14:16:57.106 -> 	stabilization status = 1.00
14:16:57.106 -> 	run in status = 0.00
14:16:57.106 -> BSEC warning code : 100
14:17:00.069 -> BSEC outputs:
14:17:00.069 -> 	timestamp = 9875
14:17:00.104 -> 	iaq = 25.00
14:17:00.104 -> 	iaq accuracy = 0
14:17:00.104 -> 	temperature = 22.70
14:17:00.104 -> 	pressure = 99610.11
14:17:00.104 -> 	humidity = 42.56
14:17:00.104 -> 	gas resistance = 5684.85
14:17:00.104 -> 	stabilization status = 1.00
14:17:00.104 -> 	run in status = 0.00
14:17:00.104 -> BSEC warning code : 100
14:17:03.156 -> BSEC warning code : 100
14:17:06.099 -> BSEC outputs:
14:17:06.099 -> 	timestamp = 15875
14:17:06.099 -> 	iaq = 25.00
14:17:06.099 -> 	iaq accuracy = 0
14:17:06.099 -> 	temperature = 25.06
14:17:06.099 -> 	pressure = 99588.34
14:17:06.099 -> 	humidity = 38.31
14:17:06.099 -> 	gas resistance = 87581.25
14:17:06.099 -> 	stabilization status = 1.00
14:17:06.099 -> 	run in status = 0.00
14:17:06.099 -> BSEC warning code : 100
14:17:09.089 -> BSEC outputs:
14:17:09.089 -> 	timestamp = 18875
14:17:09.089 -> 	iaq = 25.00
14:17:09.089 -> 	iaq accuracy = 0
14:17:09.089 -> 	temperature = 25.12
14:17:09.089 -> 	pressure = 99589.26
14:17:09.089 -> 	humidity = 38.24
14:17:09.089 -> 	gas resistance = 97061.61
14:17:09.089 -> 	stabilization status = 1.00
14:17:09.089 -> 	run in status = 0.00
14:17:09.089 -> BSEC warning code : 100
14:17:12.086 -> BSEC outputs:
14:17:12.086 -> 	timestamp = 21875
14:17:12.086 -> 	iaq = 25.00
14:17:12.086 -> 	iaq accuracy = 0
14:17:12.086 -> 	temperature = 25.19
14:17:12.086 -> 	pressure = 99587.47
14:17:12.086 -> 	humidity = 38.11
14:17:12.086 -> 	gas resistance = 102359.05
14:17:12.086 -> 	stabilization status = 1.00
14:17:12.086 -> 	run in status = 0.00
14:17:12.086 -> BSEC warning code : 100
14:17:15.081 -> BSEC outputs:
14:17:15.081 -> 	timestamp = 24875
14:17:15.081 -> 	iaq = 25.00
14:17:15.081 -> 	iaq accuracy = 0
14:17:15.081 -> 	temperature = 22.74
14:17:15.081 -> 	pressure = 99607.55
14:17:15.081 -> 	humidity = 42.38
14:17:15.081 -> 	gas resistance = 5974.61
14:17:15.081 -> 	stabilization status = 1.00
14:17:15.081 -> 	run in status = 0.00
14:17:15.081 -> BSEC warning code : 100
14:17:18.083 -> BSEC outputs:
14:17:18.083 -> 	timestamp = 27875
14:17:18.083 -> 	iaq = 25.00
14:17:18.083 -> 	iaq accuracy = 0
14:17:18.083 -> 	temperature = 22.61
14:17:18.083 -> 	pressure = 99604.16
14:17:18.083 -> 	humidity = 42.30
14:17:18.083 -> 	gas resistance = 6412.83
14:17:18.083 -> 	stabilization status = 1.00
14:17:18.083 -> 	run in status = 0.00
14:17:18.083 -> BSEC warning code : 100

Really apperciate your help.

Kind Regards
Matthias

[BSTRobin]

Hello hugehead,

For BSE2, you could refer BSEC2 code on github that supported multiple BME68X sensors.
https://github.com/BoschSensortec/Bosch-BSEC2-Library

Multiple sensors example code: https://github.com/BoschSensortec/Bosch-BSEC2-Library/tree/master/examples/x8_board_examples

[hugehead]

Hello Robin,

as described above, i checked that example already. My assumption has been, as yours, that it will read multiple BME688 sensors. But in fact, I can read one BME688 from the x8 board.

As you can see, it is creating ONE object of BME688, not multiple.

/* Create an object of the class Bsec2 */
Bsec2 envSensor;
commMux commConfig;

 and is reading one sensor at a time. I would like to accomplish a scenario, where i can read multiple sensors at a time like in my attached arduino example above. Then, i get some error 100. Please help me to find a solution to read multiple BME688 at a time.