I’m happy to finally publish the code for drawing nice 3D scatter plots of the incoming accelerometer and magnetometer data for the Ellipsoid into Sphere calibration available in the FreeIMU GUI. This will be soon released in upcoming v0.3 of the FreeIMU GUI but for now is available only on the repository.
This will allow users to have a direct realtime feedback on the performed motions and how good/wrong their sensors are calibrated.
Below a couple of screenshots. Note how screwed up was this magnetometer on it’s Z axis, compared to the calibrated sphere output.