BME688 Parallel Mode Parameters

[cweaver]

Hi!

I'm working on a project involving an array of BME688 sensors and I can't use the provided BME68x API code. I'm currently having issues collecting the gas sensing data and was hoping someone could look over the parameters I'm using. Perhaps, I have an error in how I calculate or read my data. I collect data about every 100ms. I'm hoping to add more heater profiles once I get one working. Also, there is a significant current draw once I set the sensors to parallel mode. Thanks for any help!

osrs_t = 0b001

osrs_p = 0b010

osrs_h = 0b100

iir_filter = 0

nb_conv = 0b001

gas_wait_shared = 18

gas_wait_0 = 20

res_heat_0 = 193

[BSTRobin]

Hello cweaver,

For you project, could we know the background?
Do you only need sensor API and get gas resistance value? Not use BSEC algorithm?

[cweaver]

I am collecting TPHG data from an array of 64 BME688 sensors to identify gases. For now, I just want to collect raw gas resistance and may add the BSEC algorithm in the future. When I collect data, the GAS_MSB = 0x00, GAS_LSB = 0x04 and the upper byte of MEAS_STATUS changes from 0xE and 0x8. Let me know if there's any other information I can provide. Thank you so much!

[BSTRobin]

Hello cweaver,

For reading BME688 sensor data with parallel mode, you could directly refer parallel mode example code on github.
https://github.com/BoschSensortec/BME68x-Sensor-API/blob/master/examples/parallel_mode/parallel_mode...

[cweaver]

Thank you. I have tried and confirmed that my order of operations is identical to the parallelmode sample. Do you have any insight on approximate parameter values?