BLTouch extend problem



  • Hi

    I wired and configured on a duet wifi a new bltouch original, I'm able to do self test, I'm able to extend and retract it but I read this:

    If all is well the web interface should report a value of ”0” in the Z probe column when the pin is extended. You can then lightly touch the extended probe pin to check that the pin retracts, the value in the Z probe Column should change to “1000”

    My bltouch value 0 is when is retract and 1000 if I try to touch.

    I'm trying to do M30 to make first configuration, the bltouch pin extend but when touch the bed it start blinking.

    My conf is:

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; set axis minima
    M208 X300 Y300 Z350 S0 ; set axis maxima

    ; Endstops
    ;M574 X1 Y1 Z2 S1 ; set active high and disabled endstops
    M574 X1 Y2 S0 ; set active high and disabled endstops
    M574 Z1 S2 ; set endstops controlled by probe

    ; Z-Probe
    M307 H3 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
    M558 P9 H5 F100 T2000 ; set Z probe type to bltouch and the dive height + speeds
    G31 X0 Y-36 Z0.3 P25 ; set Z probe trigger value, offset and trigger height
    M557 X60:215 Y60:215 S40 ; define mesh grid

    Thanks


  • Moderator

    @Dav said in BLTouch extend problem:

    I'm trying to do M30 to make first configuration,

    Do you mean G30 to do a probe move?

    @Dav said in BLTouch extend problem:

    G31 X0 Y-36 Z0.3 P25

    That is a very low trigger height. How did you arrive at 0.3? When mounted correctly with the base of the probe ~8mm above the nozzle tip the trigger height should be ~2mm.

    Check this out for BLtouch setup
    https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s229


  • Moderator

    What Duet are you using? How do you have it wired up? What firmware?

    When the BLTouch triggers the 1000 in the probe status may only show very very briefly or not at all. It's not a good way to test if the BLTouch is working.

    Check this instead https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe


Log in to reply