Bltouch endstop question



  • If I use a bltouch instead of a z endstop with the bltouch connected to the z endstop pins and
    M558 P9 C2 H5 F240 R0.1 T600
    M574 Z1 S1
    Then the M280 commands work and M119 shows z triggered when I manually push the pin in after a deployprobe.
    However if I use M574 Z1 S2 then deployprobe and manually press the pin, then M119 does not show z triggered.
    Should I use C2 with P9 and just leave M574 Z1 S1?
    Thx for any help.


  • administrators

    A BLTouch is not a Z endstop, even if you have it connected to the Z endstop input. To home Z using the BLTouch (or any other Z probe - no matter how you have connected it), see https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z_using_a_Z_probe.



  • I did see that but was still unsure about the m558 p9 c2 as a viable setup for the BLTouch.
    Also what happens when my m574 z1 has an s1 instead of an s2?


  • administrators

    @4lathe said in Bltouch endstop question:

    I did see that but was still unsure about the m558 p9 c2 as a viable setup for the BLTouch.

    Yes, that should be a viable setting.

    Also what happens when my m574 z1 has an s1 instead of an s2?

    If you are homing Z using a G30 command (as you should be doing whenever homing Z with a Z probe) and not a G1 S1 Z command, then it should make no difference.



  • Problem Solved but I don’t know why.
    I had m574 z1 s1
    M558 p9 h5 c2 f240 t600 and m280 p60 s10 and s90 in deployprobe.g and retractprobe.g.
    Doing a g30, the probe deployed but would not respond to manual triggering and z movement did not stop.
    I finally decided to try p4 instead of p9 and it works fine. Clearly it doesn’t know I have a bltouch anymore so g30 must by default execute deployprobe.g and retractprobe.g. If that is the case then what is p9 needed for?



  • @4lathe said in Bltouch endstop question:

    PROBLEM SOLVED. COMPLETELY
    it just required a reassignment of a pin at the board level. thx


Log in to reply