BSEC works on a subscription mechanism, and in the basic_config_state.ino example of BSEC v1.4.7.3, here is the list of virtual sensors subscribed to: bsec_virtual_sensor_t sensorList[7] = { BSEC_OUTPUT_RAW_TEMPERATURE, BSEC_OUTPUT_RAW_PRESSURE, BSEC_OUTPUT_RAW_HUMIDITY, BSEC_OUTPUT_RAW_GAS, BSEC_OUTPUT_IAQ, BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_TEMPERATURE, BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_HUMIDITY, }; iaqSensor.updateSubscription(sensorList, 7, BSEC_SAMPLE_RATE_LP); To enable more virtual sensor outputs like eCO2, bVOC-eq, etc. you would need to add these to the sensorList array element above (and update the size of the array and number of virtual sensors in the 2nd argument of updateSubscription(...)). ... View more

Could you please check which configuration fits your requirements in chapter 2.3.1 (page 6) of the Application note you linked, and let us know if that solves your power source selection? ... View more

Can you confirm that the init funtion (bme280_init()) is called and returns without any error/warning? If so, could you please share a snippet of your code including initialization, configuration of the sensor and data read-out? To verify your raw data and compensation formulas, you could use the spreadsheet shared here, although that should typically not be the case if using the official sensor API. ... View more