Tag Configuration and Sensor Calibration
This section includes:
- Tag Leonardo NFC Configuration
- Tag Leonardo Default Configuration
- Tag Wireless Configuration
- Wireless Sensor Calibration
- Console Configuration and Calibration
Tag Configuration
Sewio Tag Leonardo configuration can be done in two ways → by NFC or Wirelessly.
The configuration by NFC is done by a smartphone with NCF interface and installed Android app. The wireless configuration is done by UWB radio of a selected Anchor. Old Tags can be configured only via console.
Sewio recommends using NFC configuration.
Sensor Calibration
When the tag is configured and the sensors are activated, each sensor needs to be calibrated. The Tag Leonardo range can be calibrated wirelessly. Older tags as Tag Li-Ion and Tag iMU can be calibrated via console.
For the magnetometer, accelerometer, and gyroscope, the calibration is used to remove zero offsets. It is necessary to do this calibration if the user wants to use the spatial rotation determination. It can be useful even if raw data from sensors are sent to the server for further processing.
Magnetometer calibration
Every magnetometer has an issue that is called “hard-iron offset”. This can be removed by using the magnetometer calibration. The user must rotate the tag around all axes for 25 seconds. This procedure must be performed in an environment without any strong magnetic interference.
Inertial measurement unit calibration
Both inertial sensors: accelerometer and gyroscope also have zero offsets. They should be calibrated too if one wants to use spatial rotation determination.