Using E1 as z end stop/probe



  • hi guys its a tad unconventional but i fear i have damaged my z end stop sense some how ?
    basically to remedy this i have used a ssr on an inductive probe to act as a normal open switch but this only works as an end stop ? not a probe.... but when i plug the probe into the e1 end stop and set probe method to 6 it works as a probe but not and end stop?

    also the reason for the sense on the z stop failure i believe is the fact that i used a sot23 5v reg with my inceptive probe as a voltage dropper it works as intended but i presume the duet is not 5v tolerant ?

    this is my currant config
    ; Endstops
    M574 X2 Y2 S0 ; Set active high endstops

    ; Z-Probe
    M574 Z1 S0 ; Set endstops controlled by probe
    M558 P6 H5 F120 T6000 I1 ; Set Z probe type to switch and the dive height + speeds
    G31 P600 X-14 Y12 Z0.2 ; Set Z probe trigger value, offset and trigger height
    M557 X15:219 Y15:223 S20 ; Define mesh grid



  • so to summarise i need the inductive probe to be both probe and z end stop using the e1 input ?


  • administrators

    The endstop inputs are not guaranteed to be 5V tolerant although in practice I would be surprised if 5V damaged them. Perhaps you didn't have the right output capacitor on the voltage regulator, so it oscillated and produced much more than 5V.

    If you have a working Z probe, you don't need to have a Z endstop. See https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z.



  • @dc42 i have configured the z to use probe as end stop already ?

    and changed the board over for another one i have and re done the conversion from 12v out to a 3.3v regulator specifically zmr330fta and using output on the trig sig on z end stop and we now have a faint led on when its not triggered witch is what i thought was opposite to what was supposed to happen ? and it goes off when its touching plate but the values in the window don't change even if i set it to low or high input its either 1000 or 0 in the probe window ? and im using one of the permanent fan outputs to power the sensor and for ground for both the voltage conversion circuit and the probe ground ? and the only wire going into the z limit switch plug is the output from the zmr330fta ie 3.3v is this correct ? its all i have in my bits box for now


  • administrators

    Sounds like you are using a PNP output Z probe. You should connect it to the Z probe input, not the Z endstop input. See https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe.


 

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