jlpoole/MotionCal
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# MotionCal
![](img/MotionCal_2026-04-25_11-22.png)
MotionCal is a desktop magnetometer calibration utility originally written by Paul Stoffregen. This fork is maintained at:
```text
https://salemdata.net/repo/jlpoole/MotionCal
```
Upstream source:
Paul's upstream source:
```text
https://github.com/PaulStoffregen/MotionCal
@ -119,13 +120,18 @@ Run the GUI with:
```sh
cd /usr/local/src/MotionCal
GDK_BACKEND=x11 ./MotionCal
./MotionCal
```
Then select the T-Beam USB serial port in the MotionCal window.
If running under Wayland and the GUI has trouble starting or rendering, `GDK_BACKEND=x11` forces the wx/GTK path through X11 compatibility.
```sh
cd /usr/local/src/MotionCal
GDK_BACKEND=x11 ./MotionCal
```
## Calibration Procedure
1. Flash and start the T-Beam bridge firmware.