air quality sensor compatability

[BSTRobin]

Hello CodeOn-ArK,

It is easy to migrate your platform with examle code on github.

[franciskumar200]

Hi Robin,

I am able to read the registers from i2c using in our platform. And the below raw values are gettign and converted
as per temperature formula. Able to read the 0x22, 0x23, 0x24 temp & 0x25, 0x26 hum registers for calculating both.

But i am not getting the room temperature value. Please suggest us.

Temperature:-

temp_msb = 127 //0x22
temp_lsb = 227 // 0x23
temp_xlsb = 96 // 0x24
temp_raw = 523830
calc_temp = 153

Humidity:-

hum_msb = 74   // 0x25
hum_lsb = 140   // 0x26
hum_raw = 19084 
calc_hum = 245

Regards,
Kumar

[franciskumar200]

Hi,

I am using BME688 with our MCU (Cortex-M33) and have limited space.

I have interfaced the sensor via I2C and am able to read the raw values and able to display the Temp, Humidity, Pressure and Gas resistance.

Temp = 27.25
Hum = 35
Pressure= 943.73
GAS resi= 11822863

Now my intention is why the gas resistance value is showing always constant? And how can I convert the GAS resistance value to VOC or CO2/other gases in ppm conversion?

And I need the support to install your BEC Algorithm and libraries in our Cortex-M33 platform to cross compile the overall stack.

please share any doucments to link your libs.  

Regards,

Kumar

[BSTRobin]

Hello franciskumar200,

You could dwonload BSEC package from previous reply, then you will find integration guide document under the package.

[BSTRobin]

Hello franciskumar200,

You also could see it from BSEC package BSEC supported to output SIAQ, co2, bVOC.
BSEC_OUTPUT_IAQ = 1,
BSEC_OUTPUT_STATIC_IAQ = 2, /*!< Unscaled indoor-air-quality estimate */
BSEC_OUTPUT_CO2_EQUIVALENT = 3, /*!< co2 equivalent estimate [ppm] */
BSEC_OUTPUT_BREATH_VOC_EQUIVALENT = 4, /*!< breath VOC concentration estimate [ppm] */