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    Diode question on NPN NO level sensor

    Duet Hardware and wiring
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    • ddeflyer
      ddeflyer last edited by

      Please forgive my ignorance about diodes on this...

      According to the wiki at https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_NPN_output_normally_open_inductive_or_capacitive_sensor it says to use a bat43, bat85 or 1N4148 diode but I've only been able to locate a UF4003 and 1N5821 from the shops that are open (quarantine FTW). Will either of these work/be safe for a duet 3 or should I wait until I get a 1N4148 in the mail?

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      • dc42
        dc42 administrators last edited by

        You don't need to use a diode with Duet 3. It's only needed when using older hardware revisions of Duet WiFi/Ethernet.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • ddeflyer
          ddeflyer last edited by

          That is fantastic! Just to confirm, I should be fine to wire the power and ground of the sensor to the 24V (directly to PS or maybe OUT_2) and the signal wire into the one of the IO headers (say IO_6).

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          • Bexter
            Bexter last edited by Bexter

            And what about the Maestro. Can i connect the NPN Sensor directly on the Power + ground (24v) and the Signal on the Z-probe IN pin without any diode?

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            • aidar
              aidar last edited by

              From wiki :
              NPN output normally-open inductive or capacitive sensor

              Duet 2 Maestro, or revision 1.04 or later of Duet 2 WiFi or Duet 2 Ethernet: you can connect the output of the sensor directly to the Z-probe IN pin.

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              • Bexter
                Bexter last edited by

                Yes, I read that too. But I am not sure if I understand that correctly. Can I connect the IN pin of the Z probe without a diode and load it with 24V? I don't want to damage the board. NPN Duet Maestro.JPG

                dc42 1 Reply Last reply Reply Quote 0
                • dc42
                  dc42 administrators @Bexter last edited by dc42

                  @Bexter said in Diode question on NPN NO level sensor:

                  Yes, I read that too. But I am not sure if I understand that correctly. Can I connect the IN pin of the Z probe without a diode and load it with 24V? I don't want to damage the board. NPN Duet Maestro.JPG

                  Yes, if it's an NPN-output sensor. A PNP-output sensor required two resistors.

                  It's better to use an always-on fan output to provide power and ground to the sensor, so that the wiring is protected by the fuse on the Duet. Make sure you get the polarity right.

                  I've updated the text of that wiki page section to include Duet 3.

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                  Bexter ddeflyer 2 Replies Last reply Reply Quote 0
                  • Bexter
                    Bexter @dc42 last edited by Bexter

                    @dc42 Yes but the Maestro do not have any fuse.

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                    • ddeflyer
                      ddeflyer @dc42 last edited by

                      @dc42 Thank you!

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