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    M569 Default T parameter?

    Tuning and tweaking
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    • Kulitorum
      Kulitorum last edited by

      My Servo driver for my extruder in my concrete printer is missing steps. What is the default T parameter for the M569 command?

      Kulitorum

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      • Kulitorum
        Kulitorum last edited by

        Scope gave the answer - T0.15, right?

        Kulitorum

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        • Kulitorum
          Kulitorum last edited by

          So I was trying to figure out why my servo did not get the signal, and I noticed the voltage of the step/direction signals are only 0.3v. What can explain that?

          Kulitorum

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          • Kulitorum
            Kulitorum last edited by

            My bad, the probe was set at x10.

            Still, I am getting 3.3v, can I get 5v?

            Kulitorum

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            • dc42
              dc42 administrators last edited by

              You can't get 5V directly because the signal levels on the Duet are 3.3V. However, most external stepper drivers will work with 3.3V signals.

              External stepper drivers typically need a 1 to 2 us pulse, which you should configure in the M569 commands for the driver numbers concerned.

              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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              • Kulitorum
                Kulitorum last edited by

                Cool, but what is the default T value for the M569 command?

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                • Kulitorum
                  Kulitorum last edited by

                  I just ordered some breakout boards, I think they should solve the problem.

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                  • dc42
                    dc42 administrators last edited by

                    The default step pulse width is guaranteed to be long enough for the on-board drivers but is otherwise not defined and likely to change between firmware versions.

                    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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                    • T3P3Tony
                      T3P3Tony administrators last edited by

                      Michael, the data sheet of the servo driver should have a minimum pulse width, best to use something slightly longer in M569

                      Duet Hardware Designer
                      www.duet3d.com

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