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    is the duet 3 board able to kill an attached raspberry?

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    • Danalundefined
      Danal
      last edited by

      Did the Duet power lights come back on when everything (except 12 or 24 V VIN) was disconnected?

      If not, that is if both the Duet and the RPi are dead, this sounds like somehow 12 or 24V got on a 5V or 3.3V rail. This can and does happen via shorting in the moving cables on a hot end... look for that very carefully.

      Delta / Kossel printer fanatic

      spllgundefined 1 Reply Last reply Reply Quote 0
      • A Former User?
        A Former User @spllg
        last edited by

        @spllg said in is the duet 3 board able to kill an attached raspberry?:

        if yes, how to prevent it?

        Look up digital isolators, something like TXS0108 might fit the bill. Or maybe the more traditional series resitors and TVS diodes could work, not sure if its a good combination with the speed the SPI bus is working at.

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        • littlehobbyshopundefined
          littlehobbyshop
          last edited by

          It couldn't be something as simple as the Pi SD card dying could it? Done that before.

          BLV MGN Cube w/Hemera, K8200, Sunlu S8

          Danalundefined spllgundefined 2 Replies Last reply Reply Quote 0
          • Danalundefined
            Danal @littlehobbyshop
            last edited by

            @littlehobbyshop said in is the duet 3 board able to kill an attached raspberry?:

            It couldn't be something as simple as the Pi SD card dying could it? Done that before.

            Would not affect power LEDs.

            Delta / Kossel printer fanatic

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            • spllgundefined
              spllg @Danal
              last edited by spllg

              @Danal do you you mean: shorting heater -> termistor? going to check tonight.

              Danalundefined 1 Reply Last reply Reply Quote 0
              • spllgundefined
                spllg @littlehobbyshop
                last edited by

                @littlehobbyshop i do not think so, because mounting it from my laptop (after filesystem repair) does work fine.

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                • Danalundefined
                  Danal @spllg
                  last edited by

                  @spllg said in is the duet 3 board able to kill an attached raspberry?:

                  @Danal do you you mean: shorting heater -> termistor? going to check tonight.

                  Yes, that is one possible scenario. That would put 12 or 24 on the 5.

                  Delta / Kossel printer fanatic

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    All generation 2 Duets survive shorting thermistor inputs to Vin, except some Duet WiFi v1.0 boards and the white Duet WiFi prototypes. See https://www.youtube.com/watch?v=uyWolKFzb-A.

                    Duet 3 boards have these and additional protection measures, which I hope to demonstrate in another video soon.

                    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

                    spllgundefined 1 Reply Last reply Reply Quote 1
                    • spllgundefined
                      spllg @Danal
                      last edited by spllg

                      @Danal visually checked and measured the resistance between 12v/24v heater cables and cables to all other components at the print head and could not find any shortage.

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                      • A Former User?
                        A Former User
                        last edited by A Former User

                        @spllg said in is the duet 3 board able to kill an attached raspberry?:

                        visually checked and measured the resistance between

                        can be tricky to locate a fault in a system that moves and heats up though. the meter also use much lower voltage to test, so if you have a leakage and not a straight up short it won't find it.

                        I should get some new terminals and housings one of these days, so I could try adding an isolator to my setup, but admittedly for the Pi to risk any damage odds are you're also risking damaging the Duet3, so imho it makes more sense to focus on protecting the Duet3 in the first place.

                        edit: just finished planning out the txs0108e, if anyone decides to try DO NOT use 5v to power the isolator on either the SBC or Duet3 side, both sides need 3.3v and you'll need to find 3.3v somewhere else on the duet (IO port, temp daughter board, swd port etc)
                        edit2: brain failure. txs does not isolate properly. will try some adum-something-something anther day

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                        • spllgundefined
                          spllg
                          last edited by

                          just reconfigured (set jumpers 'internal 5v enable' and '5v->sbc') and powered the duet from my 12v psu.
                          the duet seems to be working - at least the 4 leds left of the reset button are all glowing and the red led right of the reset button is blinking. because the rpi appears to be dead i cannot proceed to do further tests.

                          jay_s_ukundefined 1 Reply Last reply Reply Quote 0
                          • jay_s_ukundefined
                            jay_s_uk @spllg
                            last edited by

                            @spllg why not try it in standalone mode to confirm its fully functional?

                            Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                            spllgundefined 1 Reply Last reply Reply Quote 0
                            • spllgundefined
                              spllg @jay_s_uk
                              last edited by

                              @jay_s_uk this would be for academic purpose only because i am already waiting for a duet 3 replacement (other issue).

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                              • spllgundefined
                                spllg
                                last edited by

                                nevertheless it would be nice to know the reason for rpi's death.

                                • was it faulty before?
                                • did it commit suicide?
                                • was it killed by an external event?
                                • was it killed by the duet?
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                                • spllgundefined
                                  spllg @dc42
                                  last edited by spllg

                                  @dc42 <All generation 2 Duets survive shorting thermistor inputs to Vin, except some Duet WiFi v1.0 boards and the white Duet WiFi prototypes. See https://www.youtube.com/watch?v=uyWolKFzb-A.

                                  Duet 3 boards have these and additional protection measures, which I hope to demonstrate in another video soon.<

                                  did you do the same tests using a duet 3 with an attached rpi? did the rpi survive?

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