After testing 7 #LilyGO #TBeamSupreme units, one thing is clear:

👉 Magnetometer calibration is not transferable between devices.

Even in similar environments, raw readings varied dramatically between units. Proper calibration isn’t optional—it’s per-device.

I also looked at how #Meshtastic handles the onboard #QMC6310… and it essentially doesn’t (no heading, no calibration).

https://salemdata.net/johnpress/?p=661

#Magnetometer #EmbeddedSystems #LoRa #Sensors #Electronics #Calibration #IoT