Documentation of the MQTT data types from Nordic Thingy

[mavaaden]

Hello,

I'm looking for some documentation, and maybe a complete list of possible data I can read over MQTT from a Nrf Thingy 91. Specifically, we're using these fields right now, but might be interested in what else is available:

AIR_PRESS - Air Pressure, in kPa?
AIR_QUAL - Air Quality, Unkown unit
BUTTON - 1 = on, 0 = off
HUMID ? Air Humidity, Unkown unit
TEMP = Temperature, in Celsius
FLIP = ? I managed to receive this a few days ago when flipping the unit, but not anymore. Might be due to damaged hardware.

Best Regards

Martin

[Heidi]

Hi!

Do you mean what kind of sensor data you can read from the Thingy:91? Because in theory, any data on the Thingy:91 can be read over MQTT.

Sensor wise it has: Environmental sensor for temperature, humidity, air quality and air pressure, plus a color and light sensor and low-power accelerometer and high-g accelerometer.

You can check out the Thingy .dts file here for all peripherals available on the device.

Best regards,

Heidi

[mavaaden]

Hello, thanks for the answer. I'm mostly interested in the fields mentioned above and what types of values exactly I'm getting. For instance if I get the following message:

{
    "data": "25.0",
    "messageType": "DATA",
    "appId": "AIR_QUAL"
}

I can see that the value is 25, but I don't know what this means. 25 in which unit? Same goes for AIR_PRESS and HUMID. Might be obvious to others, but I'm not very experienced with these kinds of sensors.

[Heidi]

Okay, I see. This is what I found: 

AIR_PRESS: pascals

AIR_QUAL: IAQ index value (0-500)

BUTTON: 1 = on, 0 = off

HUMID: %

TEMP: celsius

FLIP: string

I can't find it anywhere in the public documentation though, so I'll raise the issue internally and try to get that updated.

Best regards,

Heidi

[mavaaden]

Thank you very much, this is exactly what I was looking for!