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PWM Expansion

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Duet Hardware and wiring
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  • undefined
    3dML
    last edited by 17 Dec 2020, 06:20

    What is my best option for adding at least 4 or more pwm outputs to the Duet2 Wifi? At the moment I have a BLTouch, RPM to pb6, and most of the thermistors pins used on the expansion connecter. I have no need for any additional stepper motor drivers.

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    • undefined
      Veti
      last edited by 17 Dec 2020, 06:36

      have you used all 5 heater pins on the expansion port?

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      • undefined
        3dML
        last edited by 17 Dec 2020, 06:52

        I have not. I would prefer an expansion board of some type for cleaner wiring and also a lack of electrical component knowledge. If there is nothing reasonable I can use some external mosfets if someone will point me to the correct component and wiring diagrams. They will either be connected to fans or an ssr.

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        • undefined
          Veti
          last edited by 17 Dec 2020, 06:53

          the duex5 has the 5 pwm ports.

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          • undefined
            3dML
            last edited by 17 Dec 2020, 07:02

            I have looked the duex5 but can't justify the cost for only a few pwm outputs. It also has 5 unnecessary stepper driver.

            undefined 1 Reply Last reply 17 Dec 2020, 07:57 Reply Quote 0
            • undefined
              dc42 administrators
              last edited by 17 Dec 2020, 07:33

              You can drive most SSRs directly from the heater control outputs on the expansion connector. Connect the SSR control input between +3.3V and the chosen heater control output.

              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

              undefined 1 Reply Last reply 17 Dec 2020, 14:33 Reply Quote 0
              • undefined
                Veti @3dML
                last edited by 17 Dec 2020, 07:57

                @3dML said in PWM Expansion:

                I have looked the duex5 but can't justify the cost for only a few pwm outputs. It also has 5 unnecessary stepper driver.

                then there is the duex2

                undefined 1 Reply Last reply 17 Dec 2020, 14:55 Reply Quote 0
                • undefined
                  3dML @dc42
                  last edited by 17 Dec 2020, 14:33

                  @dc42 said in PWM Expansion:

                  You can drive most SSRs directly from the heater control outputs on the expansion connector. Connect the SSR control input between +3.3V and the chosen heater control output.

                  Just to double check. The heater control output pins have a max voltage of +3.3V input? I have already burned up one processor from overvoltage.

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                  • undefined
                    3dML @Veti
                    last edited by 17 Dec 2020, 14:55

                    @Veti said in PWM Expansion:

                    @3dML said in PWM Expansion:

                    I have looked the duex5 but can't justify the cost for only a few pwm outputs. It also has 5 unnecessary stepper driver.
                    

                    then there is the duex2

                    I have previously I have reached out to a number of my suppliers and no one has the duex2 available in the US.

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                    • undefined
                      3dML
                      last edited by 3 Jan 2021, 07:04

                      @dc42
                      Will it work to connect the PWM wire from a 4 wire 12v fan to a heater control outputs on the expansion connector?

                      undefined 1 Reply Last reply 3 Jan 2021, 07:34 Reply Quote 0
                      • undefined
                        dc42 administrators @3dML
                        last edited by 3 Jan 2021, 07:34

                        @3dML said in PWM Expansion:

                        @dc42
                        Will it work to connect the PWM wire from a 4 wire 12v fan to a heater control outputs on the expansion connector?

                        It will probably work, however if the black fan wire becomes disconnected from ground then it is likely to damage the microcontroller.

                        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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