Magnetometer calibration - ellipsoid fit in the browser

1 - Capture

Drop a capture file here

or choose a file

One x,y,z row per line (microTesla). Comma, semicolon, tab or whitespace separated, with or without a header, or raw ESPHome/serial log lines.

Capture text (paste or edit)

2 - Options

Expected field (microTesla) Input unit Drop samples closer than (microTesla) Maximum samples Extract pattern (3 groups) Declination (degrees) Target residual (%)

ready

3 - Result

Hard iron bias (microTesla)

Soft iron matrix

Quality report

Machine readable report (JSON)

C code

ESPHome lambda

Patch an ESPHome file

Drop your esphome_code.yaml and download a copy with the twelve constants replaced (all-or-nothing; your original file is untouched).

That capture could not be calibrated

Rotate the sensor slowly through all three axes - not just a flat spin - and record a few hundred samples.