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markniu / Bed_Distance_sensor

Auto bed level with High resolution distance sensor
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collision_calibrate returning wrong value #170

Open soleshoe opened 3 months ago

soleshoe commented 3 months ago

After setting collision_homing:1 collision_calibrate:1 in printer.cfg, the z-offset returned by BDSENSOR_CALIBRATE is not accurate. If i run a M102 S-6 after the G28 homing, the BDSENSOR_CALIBRATE does return accurate result.

in conclusion it seems that the colision_calibrate function is not returning accurate result. Complete sequence run :

11:05 AM M84 11:05 AM 0.34mm 11:05 AM BDSENSOR_DISTANCE 11:05 AM G1 Z0.2 11:04 AM Collision: 1.1800 mm, Bed: 106.1C 11:04 AM G28 11:04 AM 0.21mm 11:04 AM BDSENSOR_DISTANCE 11:04 AM G1 Z0.2 11:04 AM Calibrate Finished! 11:04 AM 896 11:04 AM 891 11:04 AM 887 11:04 AM 882 11:04 AM 877 11:04 AM 871 11:04 AM 865 11:04 AM 858 11:04 AM 851 11:04 AM 843 11:04 AM 833 11:04 AM 823 11:04 AM 816 11:04 AM 806 11:04 AM 795 11:04 AM 779 11:04 AM 768 11:04 AM 757 11:04 AM 743 11:04 AM 727 11:04 AM 715 11:04 AM 698 11:04 AM 681 11:04 AM 664 11:04 AM 643 11:04 AM 624 11:04 AM 602 11:04 AM 578 11:04 AM 550 11:04 AM 526 11:04 AM 508 11:04 AM 485 11:04 AM 454 11:04 AM 422 11:04 AM 392 11:04 AM 370 11:04 AM 340 11:04 AM 311 11:04 AM 290 11:04 AM 276 11:03 AM Please Wait... 11:03 AM Calibrating, don't power off the printer 11:03 AM Collision: 1.1000 mm, Bed: 106.8C 11:03 AM Homing 11:03 AM M102 S-6 11:03 AM G1 Z0 11:02 AM G1 Z10 11:02 AM 0.31mm 11:02 AM BDSENSOR_DISTANCE 11:02 AM G1 Z0.2 11:00 AM SET_HEATER_TEMPERATURE HEATER=heater_bed TARGET=105 11:00 AM G1 Z10 10:59 AM 0.31mm 10:59 AM BDSENSOR_DISTANCE 10:59 AM G1 Z0.2 10:59 AM Collision: 1.1400 mm, Bed: 51.3C 10:59 AM G28

soleshoe commented 3 months ago

The problem may be related to colision_homing. i have set colision_calibrate to 0 and here is what i get after a fresh calibration : 2:41 PM 0.59mm 2:41 PM BDSENSOR_DISTANCE 2:41 PM G1 Z0.2 2:41 PM Collision: 1.2080 mm, Bed: 30.1C 2:40 PM G28

soleshoe commented 3 months ago

if i make the same test whithout G28 (so without calling collision_homing), here is what i get after a fresh calibration : 2:46 PM 0.01mm 2:46 PM BDSENSOR_DISTANCE 2:46 PM G1 Z0 2:46 PM 1.0mm 2:46 PM BDSENSOR_DISTANCE 2:45 PM G1 Z1 2:45 PM 0.21mm 2:45 PM BDSENSOR_DISTANCE 2:45 PM G1 Z0.2 2:45 PM Calibrate Finished! 2:45 PM 880 2:45 PM 876 2:45 PM 871 2:45 PM 859 2:45 PM 859 2:45 PM 853 2:45 PM 845 2:45 PM 837 2:45 PM 830 2:45 PM 823 2:45 PM 814 2:45 PM 806 2:45 PM 796 2:45 PM 785 2:45 PM 772 2:45 PM 760 2:45 PM 749 2:45 PM 737 2:45 PM 721 2:45 PM 708 2:45 PM 691 2:45 PM 676 2:45 PM 658 2:45 PM 641 2:45 PM 614 2:45 PM 604 2:45 PM 579 2:45 PM 561 2:45 PM 541 2:45 PM 513 2:45 PM 492 2:45 PM 442 2:45 PM 443 2:45 PM 416 2:45 PM 390 2:45 PM 364 2:45 PM 335 2:45 PM 309 2:45 PM 286 2:45 PM 270 2:45 PM Please Wait... 2:45 PM Calibrating, don't power off the printer 2:45 PM M102 S-6 2:45 PM SET_KINEMATIC_POSITION Z=200

markniu commented 3 months ago

we are discussing it in the messenger of facebook, and will update the message here later.