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How to process barometer sensor reading of cc2650 SensorTag

Waqas Shafique
Prodigy 230 points
Other Parts Discussed in Thread: CC2650

I'm trying to measure barometer pressure using cc2650 SensorTag. 

The raw value for barometer sensor I'm getting is 

f9 78 48 c9 

i.e. Barometer MSB : C9

Barometer LSB : 48

F9 and 78 are of temp sensor values. 

Now my question is how can I convert this raw barometer values to get actual data ?

Is it possible that I avoid calibration calculations just to get some rough reading ? 

  • 0
    TI__Guru** 106705 points
    Hi Waqas,

    Have you read through the datasheet for the pressure sensor?

    Cheers,
    Fredrik
  • 0
    Prodigy 70 points
    Waqas,

    Did you ever get you question answered? You may want to check out this post: e2e.ti.com/.../426866.

    It looks like you are running an older version of the firmware. With 1.12 the barometer sensor returns 6 bytes: Temp(LowByte) Temp(MiddleByte) Temp(HighByte Pressure(LowByte) Pressure(MiddleByte) Pressure(HighByte). To get the temperature or the pressure you take the three bytes and divide by 100. The formula for pressure looks like this:

    ((value[3] & 0xff) + ((value[4]<<8) & 0xff00) + ((value[5]<<16) & 0xff0000)) / 100

    Hope this helps,

    digitalhack