Connected inductive probe directly to Z probe



  • Hi, I finally managed to hurt my Duet Ethernet 1.03. I wasn't paying attention and sent the output of an inductive probe directly into the z probe port. It still reads but not very well. I switched to the Z end stop and that seems to be working for now. Is there a benefit to the z_probe vs z_stop pin?

    Also is there a schematic around? I'm thinking I either blew a cap or caused direct damage to the micro controller. I can fix either problem, but before I go trying to figure out the board layout, I wanted to ask.



  • Hi,

    We need more information.

    Are you using a 12 or 24 volt power supply?

    Was the inductive probe a 5 volt model or a 10-30 volt model.

    I use 10-30 volt inductive sensors and they often output a signal that is just a bit less then the power feeding them.

    This might damage a Duet input - depending on board model, board version, board input.

    Duet 2 Wiring Diagram

    Duet 2 Wiring Guide+Wiring+your+Duet+2+WiFi-Ethernet/9)

    Frederick



  • Hi 24V power supply and a 10-30 volt probe. It put 22V directly into the Z probe port. 😞

    And of course this is the 1.03 that was not tolerant of higher voltages.

    @fcwilt said in Connected inductive probe directly to Z probe:

    We need more information.
    Are you using a 12 or 24 volt power supply?
    Was the inductive probe a 5 volt model or a 10-30 volt model.
    I use 10-30 volt inductive sensors and they often output a signal that is just a bit less then the power feeding them.
    This might damage a Duet input - depending on board model, board version, board input.
    Duet 2 Wiring Diagram
    Duet 2 Wiring Guide+Wiring+your+Duet+2+WiFi-Ethernet/9)
    Frederick



  • @cbusillo said in Connected inductive probe directly to Z probe:

    Also is there a schematic around?

    Here.



  • This post is deleted!


  • Link was broken.

    Fixed Here.



  • @cbusillo said in Connected inductive probe directly to Z probe:

    Hi 24V power supply and a 10-30 volt probe. It put 22V directly into the Z probe port. 😞

    And of course this is the 1.03 that was not tolerant of higher voltages.

    Oops.

    That could be bad.

    Even if the inputs are high voltage tolerant what are the logic levels?

    I've always used a couple of resistors to get the probe outputs down to valid and safe levels. Took some testing to figure out the values needed.

    Frederick



  • Thank you so much for the link. Kicad source is awesome. It goes through a 10k to the MCU. Its showing a much lower static resistance on one direction. I think that usually means a bad internal diode in the package. Oh well. I'll likely just live with it on this board.

    After the mishap I added a Schottky diode and its working on the Z stop. Thanks again.


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