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    Duet Expansion Header Breakout

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    • T3P3Tonyundefined
      T3P3Tony administrators
      last edited by

      Short note: we have produced a specialist breakout board for connecting external drivers that require a differential signal at 5V

      https://www.duet3d.com/Expansion_Breakout

      This is not needed for the majority of external drivers, any questions feel free to ask below!

      www.duet3d.com

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      • JRDMundefined
        JRDM
        last edited by

        Hi; I just ordered one of these for that exact purpose. Is there a hole pattern diagram for this somewhere? I'd like to cut a mount to my controller mount plate before it arrives.

        Thanks

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        • T3P3Tonyundefined
          T3P3Tony administrators
          last edited by

          I have added a wiki page on this, thanks for the prompt:

          https://duet3d.com/wiki/Expansion_breakout_board#Dimensions

          The dimensions are shown in this image:

          And the source files are on github:

          https://github.com/T3P3/Duet/tree/master/Duet_Expansion/Expansion_Breakoutv1.0

          www.duet3d.com

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          • JRDMundefined
            JRDM
            last edited by

            Nice. Thank you!

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            • Shenundefined
              Shen
              last edited by

              I just got one of these. However, none of my leadshine drivers works with the board. I don't have a oscilloscope, so I can't test the step pulse, however, with a multimeter I found the voltage between e+ and e- is 3.3v with the driver is enable and -3.3v when the driver is disabled. Is this the expected behavior? I thought it should be 0v and 5v.

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              • dc42undefined
                dc42 administrators
                last edited by

                Have you increased the step pulse width for your external drivers using the M569 command?

                The voltage reversal is intentional and helps the photodiode in the opto isolator turn off snappily.

                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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                • Shenundefined
                  Shen
                  last edited by

                  @dc42:

                  Have you increased the step pulse width for your external drivers using the M569 command?

                  The voltage reversal is intentional and helps the photodiode in the opto isolator turn off snappily.

                  Yes, I've been using the drivers (leadshine ES-D508 and EM503) with logic level converter with the same configuration. I brought the Expansion Header Breakout to get rid of the messy wrings. I've tried every single port on the Expansion Header Breakout, non of those works. another thing I've noticed is that my 7" paneldue start to flickering after I plug in the expansion header breakout and the drivers to it, the 5v voltage would change between 3.8v and 4.4v (this does not happen with the logic converters; unplugging paneldue does not help with the motors). I've tried to connect a driver back to the logic converter, it would work again.
                  Also while I tried to diagnose the problem, I noticed while using external 5v 2A source with nothing connected to the board. The 5v pin on the expansion slot only provides 4.6v, while the voltage at the input pin is 4.996v, is this normal?

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    External 5V power and USB 5V power are both fed through diodes, so it's normal for the voltage on the 5V rail to be a little low when using those 5V power sources.

                    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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                    • Shenundefined
                      Shen
                      last edited by

                      I got the problem solved. My drivers are active high but I don't have the R1 parameter in M569. so it's default to active low. It's still strange that the drivers would work without the Expansion Header Breakout.

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