What is the correct calibration sequence?

[Firefly]

I've read the Pypilot manual and watched several YouTube videos and it's still not clear what the correct calibration sequence is?

As far as I can tell, the order is:

1. Level boat.
2. Accelerometer calibration - move IMU in six directions.
3. Compass calibration - rotate IMU 360 degrees and press OK?

Also, before calibrating, should I select IMU only from the drop down menu?

Thanks!

[Jean-Marc Douroux]

This isn't what's recommended in Sean's manual, which I translated, supplemented, and reworded for users new to pypilot.

Immediately at the beginning of the "Software and Usage" section, I added a paragraph titled "Mandatory Prerequisites Before Piloting the Boat with Pypilot," which provides the order of operations and links to the other paragraphs.
It is necessary to take the time to understand 3D calibration and the usefulness of pre-calibrating the compass before installing the pilot on board and only then initializing the level.
Calibration is done not by moving IMU in six directions but by placing the computer successively on its 6 faces.

The completed manual in English is available at the following link:
https://github.com/pypilot/pypilot_doc/b...ndex.en.md

Pour ceux qui préfèrent le français, le lien est le suivant :
https://github.com/pypilot/pypilot_doc/b...ndex.fr.md
Sinon le pdf téléchargeable sur la page documentation(fr) du site internet navitop.fr est la seule que je continue à faire évoluer en attendant d'avoir du temps pour reprendre celle sur le github pypilot

[Firefly]

Thanks!
I'm trying to calibrate the compass, but the blue sphere is not showing, only a black screen. Do you know how I can fix this issue or would the compass calibration procedure still work even if the blue sphere is not displayed?

[Jean-Marc Douroux]

It's normal for the sphere to be outside the window until pypilot has enough proven measurement points to place them on the 3D sphere. This is why it's a good idea to begin a 3D pre-calibration of the magnetic sensors by slowly rotating the IMU (connected to the Pi and powered) in all directions well before installing it on board.

When phones have the same problem, they then ask the user to turn their phone in all directions.
With pypilot, there is no other solution than to turn the IMU in all directions before attaching it to the boat.

Attaching the IMU to the boat before pre-calibrating the magnetic sensors will inevitably lead to drift and error issues during the first few uses. These problems are normal, but can be surprising. A spin on the water will then not be enough to quickly position the circle of points on the 3D sphere.

With the magnetic compass pre-calibrated before the first sea trip, pypilot only has to compensate for deviations due to the boat's magnetic environment.

Sean gave us complete freedom to install the IMU in any direction we wanted, which is why we have the level button to ask pypilot to determine the orientation of the Earth's magnetic field in the horizontal plane as it was at the time we performed the level.

[Firefly]

Thanks - much appreciated!