Barometer and thermometer

iMU Tag is equipped with DPS310 barometer and thermometer sensor unit. Barometer provides very precise atmospheric pressure measurements. It has several applications like estimating the height difference between tags and anchors. It can also provide the floor level number or even direct Z coordinate (see application note Z-Axis with Barometer, Configuration). Thermometer provides temperature inside the tag. This is given the fact that DPS310 component is placed on a PCB. Temperature inside the tag can be slightly different from ambient temperature.

Data from this sensor are always sent together. There are two ways to send the data from these sensors to RTLS server:

  • Send data alone or together with other sensors data
  • Send data together with quaternion

Send data alone or together with other sensors data
This mode should be used to send pressure and temperature values without spatial rotation. Pressure information can be further recalculated to altitude (Z-axis). Further information about this feature can be in the application note Z-Axis with Barometer, Configuration.

Following modes are available for Barometer sensor:

  • Low power mode
  • Normal mode
  • High precision mode

 

Low power mode

Normal mode

High precision mode

Temperature measurement

- one times per second
- oversampling disabled

- two times per second
- oversampling disabled

- four times per second
- oversampling disabled

Pressure measurement

- once per second
- oversampling 2 times 

- two times per second
- oversampling 16 times 

- four times per second
- oversampling 64 times 

Power consumption 

5 uA

22 uA

200 uA

Relative altitude precision

±0.5 m 

±0.1 m

±0.05 m


Send data together with quaternion
Tag send spatial rotation determination along with temperature and pressure values.

Barometer will always be set to high precision in this mode.

Both temperature and pressure data are accessible via API in [Celsius] and [Pascals] respectively.

This data stream can be activated via Console Configuration and Calibration or from RTLS manager via Tag Wireless Configuration and Calibration.