Michael just shared a new tutorial: "PiicoDev Magnetometer QMC6310 - Guide for Raspberry Pi Pico"
Let’s get started with the PiicoDev® Magnetometer. In this guide, we’ll connect the Magnetometer to our Raspberry Pi Pico, get it working as a compass, and read the magnetic field strength of a nearby magnet. Finally, we’ll remix the code to crea…
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There appears to be a logic error in the calibration. Calibration uses “raw” readings
d = self.read(raw=True)
But those readings always have offsets subtracted. That means the only way to get a stable calibration is to delete the calibration.cal file (so offsets start at zero) and then run a calibration only once. Any time you repeat a calibration, it gets XYZ values that are distorted by the previous calibration.
This could be easily fixed if the calibration zeros the offset values before it starts its readings.
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Hi Philip,
Great catch, it looks like that was fixed with the revision into the MMC5603: CE-PiicoDev-MMC5603-MicroPython-Module/PiicoDev_MMC5603.py at main · CoreElectronics/CE-PiicoDev-MMC5603-MicroPython-Module · GitHub
I’ll push a commit fixing the error, in the guide I recall instructions to delete the file if a new calibration was to be performed, but from a UX perspective it definitely makes sense to not have to prod around in the files.
Liam
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