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    Voxl2 reboot due to what it seems a power limitation

    VOXL 2
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    • Alex KushleyevA
      Alex Kushleyev ModalAI Team @Riccardo Franceschini
      last edited by

      @Riccardo-Franceschini , what device are you using to measure voltage and current?

      I would recommend a few simple things to try next:

      • if you have another power module v3, just swap it out and test again
      • try swapping the 4-wire power cable that connects the power module and voxl2. Perhaps there is poor contact on the power pins

      If the issue still persists, we can try to diagnose it by logging the current draw from battery and also 5V output (power module v3 has current sensing of both)

      VinnyV 1 Reply Last reply Reply Quote 0
      • VinnyV
        Vinny ModalAI Team @Alex Kushleyev
        last edited by

        @Alex-Kushleyev @Riccardo-Franceschini
        This is most certainly not a power network or power module limitation.
        We have extensively stressed the power module for it's 6A rating many many times, including over the full industrial temp range. Every unit also undergoes a "DUT Test" of 3A load during manufacturing testing.
        The power module can certainly deliver a full 30W of Continuous power. 1A will barely make it sweat.

        The more likely culprits can be either the power cable, which often get stressed easily by pulling on the cables during extraction/removal instead of the cable shroud. This will over time shred the cable junction at the pin contacts. We have a standing rule at HQ to replace the main power cable every few months.
        Or, it might be some GPU linked trigger due to a 100% load, especially if you are not seeing any CPU issues.

        If you wish to share a photo of your setup, we can help further.
        Thanks!

        Riccardo FranceschiniR voxltesterV 2 Replies Last reply Reply Quote 0
        • Riccardo FranceschiniR
          Riccardo Franceschini @Vinny
          last edited by

          Hi,

          after experimenting, we found that the problem was a RealSense external camera that we plugged in.

          It was connected through USB via the 5G module. Probably, this was causing a short circuit or overload of the board. Anyway, modifying the connection cable so that only the data goes through the board while it is powered separately seems to solve the problem.

          Alex KushleyevA VinnyV 2 Replies Last reply Reply Quote 0
          • Alex KushleyevA
            Alex Kushleyev ModalAI Team @Riccardo Franceschini
            last edited by

            Great to hear you got it figured out!

            1 Reply Last reply Reply Quote 0
            • VinnyV
              Vinny ModalAI Team @Riccardo Franceschini
              last edited by Vinny

              Hi @Riccardo-Franceschini
              Our USB hubs have a smart power switch with a message feature that relays back to the host if there is an error/over-current condition on VBUS.
              It might be that is what was causing the reset.
              But yeah, glad you figured it out!!
              Nice work!

              VinnyV 1 Reply Last reply Reply Quote 0
              • VinnyV
                Vinny ModalAI Team @Vinny
                last edited by

                @Riccardo-Franceschini For future note, this page here lists all the VBUS capabilities in our designs so you know which port (if any) can support your high current use cases:
                https://docs.modalai.com/expansion-design-guide/#usb-expansion-over-j3--j5

                voxltesterV 1 Reply Last reply Reply Quote 1
                • voxltesterV
                  voxltester @Vinny
                  last edited by voxltester

                  @Vinny

                  I have the rebooting issue with a VOXL2 flight deck with Microhard radio.

                  I have tested with 5G board (M0090-3-01) as well. I connected a USB3 ethernet adapter on the 5G board to communicate with my laptop through ethernet cable. The same issue happened.

                  When I directly powered the system by using a power supply (5V) without a power module, it did not show any rebooting issue....
                  I am still figuring out, so please let me know what I need to try...

                  VinnyV 1 Reply Last reply Reply Quote 0
                  • VinnyV
                    Vinny ModalAI Team @voxltester
                    last edited by

                    Hi @voxltester
                    Please take a look at this old thread: https://forum.modalai.com/topic/1356/sentinel-drone-randomly-reboots?_=1673383475709

                    Let us know if that issue with J5 is what is happening.

                    It is unlikely you are pulling too much current in normal operations as you more than likely have a fault if you think the 5V is drooping.

                    Thanks!
                    Vinny

                    1 Reply Last reply Reply Quote 0
                    • voxltesterV
                      voxltester @Vinny
                      last edited by voxltester

                      @Vinny

                      I will have a look.

                      This is very randomly happening...
                      I changed power source (battery, wall power), but it is working well now...

                      Is there any way to check GPU usage on VOXL2?

                      Eric KatzfeyE 1 Reply Last reply Reply Quote 0
                      • Eric KatzfeyE
                        Eric Katzfey ModalAI Team @voxltester
                        last edited by

                        @voxltester voxl-inspect-cpu will show you GPU utilization and temperature

                        voxltesterV 2 Replies Last reply Reply Quote 0
                        • voxltesterV
                          voxltester @Eric Katzfey
                          last edited by voxltester

                          This post is deleted!
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                          • voxltesterV
                            voxltester @Eric Katzfey
                            last edited by

                            This post is deleted!
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