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probe_eddy_current: runtime calibration curve adjustment

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Eddy coils without temperature compensation will suffer
from temperature drift.
Proportional to the sensor to bed distance.
Make non-tap methods useful by adding configurable offset correction.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
This commit is contained in:
Timofey Titovets 2026-01-01 21:26:07 +01:00
parent 1fe9fb3ad4
commit 44b2042449
1 changed files with 15 additions and 0 deletions
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15
klippy/extras/probe_eddy_current.py
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@ -18,6 +18,7 @@ class EddyCalibration:
# Current calibration data
self.cal_freqs = []
self.cal_zpos = []
self._cal_zpos_offset = .0
cal = config.get('calibrate', None)
if cal is not None:
cal = [list(map(float, d.strip().split(':', 1)))
@ -34,6 +35,10 @@ class EddyCalibration:
gcode.register_command('Z_OFFSET_APPLY_PROBE',
self.cmd_Z_OFFSET_APPLY_PROBE,
desc=self.cmd_Z_OFFSET_APPLY_PROBE_help)
gcode.register_mux_command('PROBE_EDDY_CURRENT_CALIBRATION_OFFSET',
"CHIP", cname,
self.cmd_CALIBRATION_OFFSET,
desc=self.cmd_CALIBRATION_OFFSET_help)
def get_printer(self):
return self.printer
def verify_calibrated(self):
@ -62,6 +67,7 @@ class EddyCalibration:
gain = (this_zpos - prev_zpos) / (this_freq - prev_freq)
offset = prev_zpos - prev_freq * gain
zpos = adj_freq * gain + offset
zpos += self._cal_zpos_offset
samples[i] = (samp_time, freq, round(zpos, 6))
def freq_to_height(self, freq):
dummy_sample = [(0., freq, 0.)]
@ -277,6 +283,15 @@ class EddyCalibration:
z_freq_pairs = zip(cal_zpos, self.cal_freqs)
z_freq_pairs = sorted(z_freq_pairs)
self._save_calibration(z_freq_pairs)
cmd_CALIBRATION_OFFSET_help = "Runtime curve height adjustment"
def cmd_CALIBRATION_OFFSET(self, gcmd):
is_update = gcmd.get('OFFSET', None)
if is_update is None:
msg = "Calibration OFFSET=%.6f" % self._cal_zpos_offset
gcmd.respond_info(msg)
return
self._cal_zpos_offset = gcmd.get_float("OFFSET", minval=-0.5,
maxval=0.5)
def register_drift_compensation(self, comp):
self.drift_comp = comp