Not new output from BSEC-2.0.6.1

[RPN93]

Hi,

Im using a BME688. At first, I was using just BME68X-API, avalible on github, and values of temperature, humidity, pressure and gas resistance were ok.

Then, I wanted to add IAQ and CO2 values, so I added BSEC-2.0.6.1 library. Everything on my code seems to work properly. The functions 'bsec_init()', bsec_update_subscription()', bsec_sensor_control()' and 'bsec_do_steps()' return 0, what supposedly means that everything is working fine.

However, any values are returned from bsec_do_steps(). The temperature, pressure and humidity values are the same from the API, and IAQ and CO2 values are 0.

What could be the problem?

Thanks.

[BSTRobin]

Hi RPN93,

What platform are you running on? And do you run unmodified reference code?

[RPN93]

Hi BSTRobin,

Im using my own PCB design with BME688 component. BME688 works with I2C, and Im using 'Contiki' operative system for this. This implementation worked with BME68x-API.

For BSEC, I have followed the official examples on github. In the main() function I've initialice 'bsec_init()' and 'bsec_update_subscription()'. The outputs that I want are this:

requested_virtual_sensors[0].sensor_id = BSEC_OUTPUT_IAQ;
requested_virtual_sensors[0].sample_rate = BSEC_SAMPLE_RATE_HIGH_PERFORMANCE;
requested_virtual_sensors[1].sensor_id = BSEC_OUTPUT_CO2_EQUIVALENT;
requested_virtual_sensors[1].sample_rate = BSEC_SAMPLE_RATE_HIGH_PERFORMANCE;
requested_virtual_sensors[2].sensor_id = BSEC_OUTPUT_RAW_TEMPERATURE;
requested_virtual_sensors[2].sample_rate = BSEC_SAMPLE_RATE_HIGH_PERFORMANCE;
requested_virtual_sensors[3].sensor_id = BSEC_OUTPUT_RAW_PRESSURE;
requested_virtual_sensors[3].sample_rate = BSEC_SAMPLE_RATE_HIGH_PERFORMANCE;
requested_virtual_sensors[4].sensor_id = BSEC_OUTPUT_RAW_HUMIDITY;
requested_virtual_sensors[4].sample_rate = BSEC_SAMPLE_RATE_HIGH_PERFORMANCE;

Then , in the loop, I do next:

For 'bsec_do_steps()' I used the next inputs:

inputs[0].sensor_id = BSEC_INPUT_PRESSURE;
inputs[0].signal = dataBME.pressure;
inputs[0].time_stamp = time_stamp;
inputs[1].sensor_id = BSEC_INPUT_HUMIDITY;
inputs[1].signal = dataBME.humidity;
inputs[1].time_stamp = time_stamp;
inputs[2].sensor_id = BSEC_INPUT_TEMPERATURE;
inputs[2].signal = dataBME.temperature;
inputs[2].time_stamp = time_stamp;
inputs[3].sensor_id = BSEC_INPUT_GASRESISTOR;
inputs[3].signal = dataBME.gas_resistance;
inputs[3].time_stamp = time_stamp;
inputs[4].sensor_id = BSEC_INPUT_HEATSOURCE;
inputs[4].signal = 0.0f;
inputs[4].time_stamp = time_stamp;

So what could be the problem for IAQ=0 AND co2 =0??

Accuracy for all the values return 0.

Thanks.

[BSTRobin]

Hi RPN93,

I'm not sure if you have any problems in manually adding sensor API and BSEC-2.6.0.1. It is recommended that you download  package from here and run basic_config_state example directly. BSEC_2.0.6.1_Generic_Release contained sensor API and BSEC-2.6.0.1.
https://www.bosch-sensortec.com/software-tools/software/bme688-software/