BSEC BME680 measures 10 times then stops.

[acanthe]

I am attempting to get the BME680 up and running on the nrf52840dk board and I am using the iot example provided code.

My problem is that after a certain amount of time (its the same timestamp), output_ready is no longer called and only bme680_get_sensor_mode is called every ~33 seconds despite being on LP mode.

I'm hoping for some guidance in how to start troubleshooting this because I am a little lost as to what I can do without modifying the bsec library. The numbers at the end of the status values are tags I added for identification (so I knew which one was called).

I have attached the .c file for the iot_example I am using and the main function is below (its just the stock code included):

/*---------------------------------------------------------------------------*/
PROCESS_THREAD(env_test_process, ev, data)
{

PROCESS_BEGIN();

return_values_init ret;
i2c_init();
ret = bsec_iot_init(BSEC_SAMPLE_RATE_LP, 0.0f, bus_write, bus_read, sleep, state_load, config_load);
if (ret.bme680_status)
{
LOG_INFO_("Could not initialise BME680\n");
}
else if (ret.bsec_status)
{
LOG_INFO_("Could Not Initialise BSEC Library\n");
}

bsec_iot_loop(sleep, get_timestamp_us, output_ready,state_save, 10000);
PROCESS_END();
}

/*---------------------------------------------------------------------------*/

LOG OUTPUT:

__________________________

------------MEASUREMENTS----------x100--------
bsec_status: 0
timestamp: 24101562000
IAQ index: 2500, Accuracy: 0
Temperature: 2900
Humidity: 4600
Pressure: 10020800
Gas: 2773500
CO2 Equivalent: 0
VOC Equivalent: 0
bme680_status = 0 4
bme680_status = 0 3
bme680_status = 0 1
bme680_status = 0 6
bsec_status = 0 5

------------MEASUREMENTS----------x100--------
bsec_status: 0
timestamp: 27101562000
IAQ index: 2500, Accuracy: 0
Temperature: 2900
Humidity: 4600
Pressure: 10020400
Gas: 2983900
CO2 Equivalent: 0
VOC Equivalent: 0
bme680_status = 0 4
bme680_status = 0 3
bme680_status = 0 1
bme680_status = 0 6
bsec_status = 0 5

------------MEASUREMENTS----------x100--------
bsec_status: 0
timestamp: 30101562000
IAQ index: 2500, Accuracy: 0
Temperature: 2900
Humidity: 4600
Pressure: 10020800
Gas: 3168200
CO2 Equivalent: 0
VOC Equivalent: 0
bme680_status = 0 4
bme680_status = 0 3
bme680_status = 0 1
bme680_status = 0 6
bsec_status = 0 5

------------MEASUREMENTS----------x100--------
bsec_status: 0
timestamp: 33109375000
IAQ index: 2500, Accuracy: 0
Temperature: 2900
Humidity: 4600
Pressure: 10020800
Gas: 3320700
CO2 Equivalent: 0
VOC Equivalent: 0
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1
bme680_status = 0 1

[EmiQS]

Hello acanthe, I'm experiencing similar issues. In my case the regular cycle takes 10.6seconds, but some times BSEC takes as long as 120seconds to give me a IAQ value.

I see in your logs IAQ is always 25. Are you having problems with IAQ not moving from 25 (acc = 0) too?

I'll follow your topic!

Regards.

[acanthe]

At the moment I am just trying to get it to continually get measurements (I assumed its not having time to calibrate/settle) but I can imagine once this is solved I may have that problem.

Nice to know I am not the only one with this issue!

NOTE: the device isn't hanging, from what I have gathered so far it looks like sensor_settings->trigger_measurement and sensor_settings->process_data are both 0 after a minute or so and do not change.

[Minhwan]

Hello Acanthe, 

Are you using BSEC 1 or 2? 

If you are using BME680, you have to use BSEC 1. If you pursue to use BSEC 2, please use BME688. 

And if you are using BME680 and BSEC 1 and facing this issue, please let me know which example you are using. 

Thank you. 

[acanthe]

Hi Minhwan,

I have checked version and I am using BSEC 1.4.8.0.

As for which example, its the bsec_iot_example.c file. I have filled in the functions except for config_load (arduino example doesnt seem to need this to run)