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    PS_ON usage

    Duet Hardware and wiring
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    • fma
      fma last edited by

      Hi!

      I would like to use the PS_ON signal to be able to power on/off my 24V supply, which is not a PC supply. So, I will need to use a little relay.

      How is PS_ON signal wired, on Duet side? How can I use it to drive my relay? Does it need some special protection?

      Thanks,

      Frédéric

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      • dc42
        dc42 administrators last edited by

        PS_ON is connected to an open-drain N-channel mosfet. You can use it to drive an SSR directly by connecting the negative control terminal to PS_ON and the positive control terminal to +3.3V or +5V. If you use to drive a mechanical relay, you must connect a flyback diode in parallel with the relay coil.

        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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        • fma
          fma last edited by

          Perfect!

          Thanks.

          Frédéric

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          • Cata
            Cata last edited by

            One of this can work? I use with raspberry pi for led lights

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            • fma
              fma last edited by

              Looks like there is an optocoupler? Do you have a link?

              Frédéric

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              • Cata
                Cata last edited by

                Search some like arduino relay module.

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                • DjDemonD
                  DjDemonD last edited by

                  If you use the flyback diode, as its still a mechanical relay with a magnetic coil which can shunt a whack of voltage back when de-energised. Check the coil voltage you'll need to supply the positive side of the coil with the right voltage for the duet to switch the negative side of the coil. 5v or 3.3v coil probably makes sense in terms of being able to get the supply easily.

                  Simon. Precision Piezo Z-Probe Technology
                  www.precisionpiezo.co.uk
                  PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                  • fma
                    fma last edited by

                    The above boards seems to have an optocoupler, so no need to use a flyback diode on the Duet side. It is already included on the board, after the optocoupler, on the relay side (I think it is D2).

                    Frédéric

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                    • Cata
                      Cata last edited by

                      Do you use the board finally?

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                      • fma
                        fma last edited by

                        Non, I don't control my power supply yet…

                        Frédéric

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                        • Cata
                          Cata last edited by

                          I will try to use the same for emule a button connected to one rpi gpio. Waiting the script now

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                          • Amilious
                            Amilious last edited by

                            the whole fly back diode is confusing to me. I am using this relay http://modtronix.com/mod-rly2-5v.html and on that page it looks like the schematic has a diode. I have a 1N4001 diode on hand do i want to add it. If so where.

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                            • dc42
                              dc42 administrators last edited by

                              That's a relay module, not just a relay, so you don't need to use a flyback diode with it.

                              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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