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    Questions regarding endstop voltages and Duex2/5

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    Duet Hardware and wiring
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    • botundefined
      bot
      last edited by

      Hi everyone,

      I have a couple Duet Wifi (early production) but haven't put them to use yet (still designing mechanical hardware). The switches I want to use for endstops specify a minimum 5vdc for operation. AFAIK, the duet does not natively support this, but the duex2/5 expansion boards do. Is this correct? My printer design will need a duex espansion board anyway, so this makes for an easy solution. Presumably I would simply have to configure the use of the additional endstops rather than the typical ones.

      Basically, my question is regarding the base Duet board – it does not have the functionality to use a jumper to set 5vdc for endstops, correct?

      *not actually a robot

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      • dc42undefined
        dc42 administrators
        last edited by

        You haven't said what type of endstops they are. Some 5V endstops can be modified to work from 3.3V, and some can be powered from 5V while providing a 3.3V-compatible output. See https://duet3d.com/wiki/Connecting_endstop_switches.

        The firmware does not currently allow you to swap endstop connectors around.

        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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        • botundefined
          bot
          last edited by

          This is the switch I would like to use:

          https://us.misumi-ec.com/vona2/detail/110302201870/?ProductCode=N-CMST

          Here is some info from the PDF linked in the "More Information" tab:

          Contact Rating DC5~24V 20mA (MAX) Resistive Load (10mA with LED)
          Dielectric
          Strength 100MΩ or More DC250V Megohm-meter
          Withstand
          Voltage AC500V 50/60Hz, 1 min. between Each Terminal and Case

          *not actually a robot

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          • stripsundefined
            strips
            last edited by

            I'm not sure by the description or on Misumis pages but I get the impression this is a mechanical switch with 2 wires. If so the led will be lit by 5-24V while switch circuit is not closed. You only need >= 5V if you want the LED to be lit.

            Ender 5 Plus, E3D Bigbox Dual

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            • dc42undefined
              dc42 administrators
              last edited by

              I suggest you get the version without the LED. The LED may stop the Duet recognising the difference between triggered and not triggered.

              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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              • botundefined
                bot
                last edited by

                Thanks. for that suggestion. I was leaning that way, just because a constantly lit LED would be annoying. Do you think the switch will work with 3.3v? I'm not sure why it wouldn't, but I'm also not an electrical engineer.

                *not actually a robot

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  I can't see why the version without the LED wouldn't work on 3.3V.

                  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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                  • botundefined
                    bot
                    last edited by

                    Thanks, I'll give it a shot. I should have two IDEX printers to test the firmware on within 1-2 months. (This is the reason I want to use switches with such precision – aligning idex heads).

                    *not actually a robot

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