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    Multiple BME680 devices with BSEC

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    Occasional Visitor

    Multiple BME680 devices with BSEC

    Hello,

    is it possible to process multiple BME680 devices with BSEC library? Our application implements two BME680 devices, each using a dedicated I2C bus. As far as I understood, it's not possible to pass duplicate (physical) sensor IDs to he library. How can I pass different physical sensor instances to the BSEC library?

    Thanks,

    Paul 

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    6 REPLIES 6
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    Community Moderator

    Re: Multiple BME680 devices with BSEC

    We are currently investigating the best way to approach this feature, and will provide an update once we can offer a potential solution.

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    Re: Multiple BME680 devices with BSEC

    Hi,

    According to page 18 from BST-BME680-Integration-Guide-AN008-47.pdf, it should be possible no?

    Here pseudo code from that page:

     

    "2.8 Simulate multiple sensors using single BSEC instance


    Last but not least, it is possible to simulate data collected from multiple sensors with one BSEC instance by following below integration pseudo-code:
    call_update_subscription() // Same sampling period and outputs for all sensors
    retrieve_state_file() // Get default state string
    call_dummy_do_step() // do_step needs to be called for proper initialization of the library. Populate
    input struct with time stamp equal to zero, sensor id of BSEC_INPUT_TEMPERATURE and signal equal to 25
    for (i_sensor = 0; i_sensor < n_sensors; i_sensor++){ // For loop for all sensors
    load_state_file(i_sensor) // Load state string for the particular sensor. In case that the sensor was
    not used before, use default state string values from the library
    set_input(i_sensor, input) // Populate input struct using recorded data-point
    call_do_steps(input) // Call do_steps
    retrieve_state_file(i_sensor) // Retrieve state string for the particular sensor
    }"

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    New Poster

    Re: Multiple BME680 devices with BSEC

    Hi,

    I'm also looking to accomplish the same thing.

    I tried following the pseudocode as provided in the integration guide.  But when i call bsec_do_steps with the provided values to "initialize" it returns an error.

    bsec_init();
    
    bsec_set_configuration(serialized_settings, n_serialized_settings, work_buffer, n_work_buffer);
    
    bsec_update_subscription(requested_virtual_sensors, n_requested_virtual_sensors, required_sensor_settings, &n_required_sensor_settings);
    
    bsec_input_t input[1];
    input[0].sensor_id = BSEC_INPUT_TEMPERATURE;
    input[0].time_stamp = 0;
    input[0].signal = 25;
    
    bsec_output_t output[BSEC_NUMBER_OUTPUTS];
    uint8_t  n_output = BSEC_NUMBER_OUTPUTS;
    
    bsec_status = bsec_do_steps(input, n_input, output, &n_output);
    // bsec_status = BSEC_W_DOSTEPS_TSINTRADIFFOUTOFRANGE (4)

     This same error arrises when i skip this initialization step and loop over all sensors while swapping states.

     

    Am I doing something wrong?

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    New Poster

    Re: Multiple BME680 devices with BSEC

    Okay, I think I have it figured out.

    The pseudocode given in the documentation is not very clear (and possibly wrong).

    I've managed to get it working using the following pseudocode:

    for (i_sensor = 0; i_sensor < n_sensors; i_sensor++){ // For loop for all sensors
        call_init_bsec() // Re-initiate the bsec library
        call_bsec_set_configuration() // Set the configuration
        call_update_subscription() // Set the subscription sampling rate
        load_state_file(i_sensor) // Load state string for the particular sensor. In case that the sensor was not used before, skip this step
        call_bsec_sensor_control() // Get the sensor settings to be used (This seems to be nessecary to call)
        set_input(i_sensor, input) // Populate input struct using recorded data-point
        call_do_steps(input) // Call do_steps
        retrieve_state_file(i_sensor) // Retrieve state string for the particular sensor
    }
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