BlTotouch and Duet

  • Hi,

    More issues… while solves the problems i am having with Mini Ir Probe, i have decided to install BlTouch....but dont works.

    Someone sees some error...

    I am followed this guide, located in facebook group for TLM Duet users:


    A - When start printer, BlTouch blinks and deploy/retract
    B- But…. When execute a macro from deploy or retract, the same error message

    M98 P0:/macros/BlTouchDeploy.g
    Error: Invalid servo index 3 in M280 command

    The contents of macro "BlTouchDeploy.g" is:

    M280 P3 S10 I1

    One posibility… is that PIN8, its no H3...

    Some ideas?
    Help for someone working with BlTouch in Duet.

    P.D.: Trace in rear BlTouch is cuted, and i have tested there isn't continuity

  • administrators

    That error message suggests that you don't have the M307 H3 A-1 C-1 D-1 command in config.g. Try sending M307 with no parameters. If that line is present and working, the response should be "Heater 3 is disabled".

  • hi,

    this have in config.g, i have copy from guide….

    ; BL-Touch
    M307 H3 A-1 C-1 D-1 ; reserve pin 21 for M42 or servo use
    M558 P5 X0 Y0 Z1 H5 F100 T2000
    G31 P25 X0 Y0 Z1.083; Set Z probe trigger value, offset and trigger height

  • administrators

    …and what response do you get if you send M307 with no parameters?

    You may have a M307 H3 command in config-override.g too. If so, delete it.

  • Eeee…

    No response, double check...


    Now, when send by console Retract and Deploy. Nothing happens
    And BlToucn after start, rest lighted

  • I follwed this guide to get my bltouch working:
    The only thing I needed to change was adding the I1 to the end of the deploy/retract commands.

  • i have followed this guide too.. and nothing, don't works…

    I do not know if the behavior is normal.
    When I turn on the printer, the BlTouch, makes a test, the tip comes out and picks up, two or three times. When this test ends, a red light remains on.
    Is it normal for this red light to stay on?
    It sounds to me that this indicated an error. Do not?

  • No, it is correct if it stays red after the initial self test. Mine does that too and works fine.
    If deployed the led is off, and when I tip it / it gets contact to the plate when probing the led turn red again.
    (I have the bltouch smart)

  • Hi,

    thanks to all, and sorry for disturb….

    Mistake mine, how no.....

    Whats the mistake...

    i was conecting (BlTouch- Orane pin - Ctrl) to (Duet -Expansion socket - PIN 7) and.... NO, BIG NO its in PIN 8

    This is correct: (BlTouch- Orane pin - Ctrl) to (Duet -Expansion socket - PIN 😎

    Thanks to all, and sorry

  • Another question…

    When i have instaled Mini IR sensor, the field (Z-Probe) of web interface, chage when Mini IR was triggered...

    With BlTouch, this field, have to change? or show any valor?

  • administrators

    I think the bltouch produces just a short pulse, so you probably won't see the reading change in the web interface. To test the Z probe, with the probe a long way above the bed, send G30. Then hold an obstruction below the bltouch to trigger it. If triggering the bltouch doesn't stop the Z movement, turn off power to the printer or use emergency stop before it reaches the bed.

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