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    Intergrating a precision piezo in Duet-wifi

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    Duet Hardware and wiring
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    • mendeleviumundefined
      mendelevium
      last edited by

      I purchased a Precision Piezo kit (original from precision piezo) and I am truly disappointed with both their support and response. The Chat nobody replies and neither to my e-mails. The online documentation is inadequate. Now I come to my issue. I am still playing around with wireing it but the kit I bought has a V2.85 board.
      My issue is that the board has 15 pins coming out and there is no clear explanation why there are so many pins.
      Starting from the top row- the two top pins are marked PZ+ and PZ- which I assume connect to the piezo disk ( again do not know why I have 3 disks)
      the next row of pins is marked ground and have a white marking indicating the 3 pins are all connected
      the next two rows are marked confusingly. Knowing how delicate electronic components are, I am reluctant to try to wire it blindly...
      from what I gathered, the connections to the duet are SIGNAL /GROUND/POS+Ve

      The pins on the duet board are identified by starting from the side of the expansion slot.

      FIRST PIN is the positive which is the 3.3V pin n slot
      SECOND PIN -unused
      THIRD PIN- Ground
      FOURTH PIN - Z Probe in

      could someone confirm these connections and tell me why there are so many pins? do not want to fry anything.

      Many thanks!
      24d304f5-23e6-4ac4-940c-0064d099f93c-image.png

      c92cd811-385f-47b4-8d74-7bb9d6b93ea0-image.png

      whosrdaddyundefined 1 Reply Last reply Reply Quote 0
      • whosrdaddyundefined
        whosrdaddy @mendelevium
        last edited by whosrdaddy

        The reason that there many pins is that you can easily connect multiple piezo disks.
        For example, I have 4 disks in my setup (2 x 2 in parallel, 1 for pickup, 1 for noise canceling)
        The confusing part is that the piezo's connect horizontally but the connection towards the Duet is a vertical connection

        This is the order - I am using the first image as a reference here, second image inverts the pcb.

        As you see on the silkscreen the 2 bottom vertical stacks are the same:

        Top pin connects to Duet Z Probe in
        Middle pin connects to Duet Ground
        Bottom pin connects to Duet 3.3V

        The pins to the top are 3 horizontal pairs to connect piezo disks to, make sure you respect the polarity (use a multimeter if you are not sure) otherwise the board will perform bad

        The pins in the middle are just ground and are generally not used.

        here is an attempt explaining it with Paint:
        piezo.png

        Hope this helps

        mendeleviumundefined 1 Reply Last reply Reply Quote 2
        • mendeleviumundefined
          mendelevium @whosrdaddy
          last edited by

          @whosrdaddy
          Thanks so much as you have given me all in one go.
          I still have to wad through the firmware bit to have this operational,
          Thanks again.

          whosrdaddyundefined 1 Reply Last reply Reply Quote 0
          • whosrdaddyundefined
            whosrdaddy @mendelevium
            last edited by

            @mendelevium What board do you have? I can give you my setup if you want (Duet 2 Wifi here)

            mendeleviumundefined 1 Reply Last reply Reply Quote 0
            • mendeleviumundefined
              mendelevium @whosrdaddy
              last edited by

              @whosrdaddy
              I have the duet 2 wifi board
              Thanks

              whosrdaddyundefined 1 Reply Last reply Reply Quote 0
              • whosrdaddyundefined
                whosrdaddy @mendelevium
                last edited by

                These are my relevant lines in config.g, I use the piezo's as underbed Z-probe:

                M574 Z1 S2                                           ; Set endstops controlled by probe
                M558 P8 X0 Y0 Z1 H6 I1 R0.3 F900 T9000 A6 S0.015     ; Piezo V2 probe used for homing Z axis, dive height 2cm, probe speed 600mm/min, travel speed 150mm/s
                G31 P500 X0 Y0 Z-0.14                                ; Set Z probe trigger value, offset and trigger height
                
                mendeleviumundefined 3 Replies Last reply Reply Quote 0
                • mendeleviumundefined
                  mendelevium @whosrdaddy
                  last edited by

                  @whosrdaddy
                  Thanks, that is a starter. I wish to check if all is working really to see if the piezo and its wireing is ok. before moving on.
                  I did not have an intention of running it under the bed but I am still open to anything. My printer runs on ballscrews on all axis. I have a 220V aluminium plate heated via a silicone pad heater. The heatbed is a 6mm precision aluminium plate and a 3mm glass plate on top

                  1 Reply Last reply Reply Quote 0
                  • mendeleviumundefined
                    mendelevium @whosrdaddy
                    last edited by

                    @whosrdaddy
                    For homing Z, I used a high precision CNC machine reference switch.

                    1 Reply Last reply Reply Quote 0
                    • mendeleviumundefined
                      mendelevium @whosrdaddy
                      last edited by

                      @whosrdaddy
                      I am having a problem because the PCB seems not to be powered.
                      for the power to be supplied to the pins on the board, is there a need of some specific command to get the pins powered? or the supply should be already there?
                      If this is so, I need to open up the controller and check the wireing....

                      whosrdaddyundefined 1 Reply Last reply Reply Quote 0
                      • whosrdaddyundefined
                        whosrdaddy @mendelevium
                        last edited by

                        The piezo board should receive power from the Duet.
                        you are using the Z probe in connector on the Duet right?

                        1 Reply Last reply Reply Quote 0
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