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    inductive probe

    Duet Hardware and wiring
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    • stewwy
      stewwy last edited by

      I have an NPN probe I'm replacing my bltouch clone with.

      The clone works 95% of the time, this means mesh compensation is a bit hit and miss, literally. 🙄

      A quick question, can I pick up the 12v from the permanently on fan connection. I can't see any reason why not but better safe than sorry , which is why I'm asking.☺

      Thanks in advance

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      • dc42
        dc42 administrators last edited by

        @stewwy said in inductive probe:

        A quick question, can I pick up the 12v from the permanently on fan connection.

        Yes, you can.

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        • TLeTourneau
          TLeTourneau last edited by

          Great subject, thanks! Would that also work with a 24V power supply using VIN for the fans and a SN04-N?

          The SN04-N has the following markings:
          BN-10~30V
          BK-NPN-NO
          BU-0V

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          • stewwy
            stewwy last edited by

            Well it worked for me, thanks ☺

            @TLeTourneau don't forget the diode on the signal lead

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            • TLeTourneau
              TLeTourneau last edited by

              @stewwy thanks! I am just trying to find a source where I don't have to get a 50 pack of them. 🙂

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              • stewwy
                stewwy last edited by

                got mine for £2 for 5 x bat42 from ebay and they are always useful for this sort of thing

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                • TLeTourneau
                  TLeTourneau last edited by

                  Would a 1N5818 Schottky work?

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                  • dc42
                    dc42 administrators last edited by dc42

                    The diode isn't needed if you have a version 1.04 Duet, but make sure you connect the sensor output to the correct pin of the Z probe connector (the one labelled IN).

                    And a 1N5818 would work.

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                    • TLeTourneau
                      TLeTourneau @dc42 last edited by TLeTourneau

                      @dc42 Thanks! I've connected the probe with the output (black wire) going to the Z Probe In, the negative (blue wire) going to the ground connection on the Z probe header and the positive (brown wire) going to the positive on an always on fan header. I have a V1.04 board so I did not use the Schottky although the BAT43's did arrive today :). The probe light comes on when the bed is near, now I just need to work out the configuration based on the information in the wiki. Thanks again for the help!

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                      • dc42
                        dc42 administrators last edited by

                        In the M558 command in config.g use either P8 or P5, and also use I1.

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