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Issues with controller and drone

Scheduled Pinned Locked Moved Starling & Starling 2
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  • Eric KatzfeyE Eric Katzfey

    @daniellee Okay, well I would have just recommended power cycling the drone. Let's look at your personal drone now. Seems that the RC is working fine since you can see it in QGC. Why do you say it is not receiving inputs from the RC? What are you doing that convinces you of that?

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    daniellee
    Contributor
    wrote last edited by
    #11

    @Eric-Katzfey That is the problem. Every time I power cycle the system, it does not keep the services necessary for flight enabled. I will power cycle the drone to show that it does not stay enabled. After power cycling I enabled the px4 service because it was not enable on start up so that I can view the vehicle status.
    cd263341-263d-46a1-b4c7-75131d06148a-image.png
    The preflight failed in the adb shell. But is passing in QGC.

    I can see the radio RC transmitter moving the joysticks in QGC but the drone does NOT take off. So movement commands sent via the controller are being seen but not used by the drone. Screenshot from 2026-06-16 18-36-07.png Screenshot from 2026-06-16 18-36-45.png
    This is what I mean by the joystick inputs not working. These photos show that the controller is connected and the inputs are being read. However, the drone is not using them.

    Eric KatzfeyE 1 Reply Last reply
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    • D daniellee

      @Eric-Katzfey That is the problem. Every time I power cycle the system, it does not keep the services necessary for flight enabled. I will power cycle the drone to show that it does not stay enabled. After power cycling I enabled the px4 service because it was not enable on start up so that I can view the vehicle status.
      cd263341-263d-46a1-b4c7-75131d06148a-image.png
      The preflight failed in the adb shell. But is passing in QGC.

      I can see the radio RC transmitter moving the joysticks in QGC but the drone does NOT take off. So movement commands sent via the controller are being seen but not used by the drone. Screenshot from 2026-06-16 18-36-07.png Screenshot from 2026-06-16 18-36-45.png
      This is what I mean by the joystick inputs not working. These photos show that the controller is connected and the inputs are being read. However, the drone is not using them.

      Eric KatzfeyE Offline
      Eric KatzfeyE Offline
      Eric Katzfey
      ModalAI Team
      wrote last edited by
      #12

      @daniellee So when you power cycle the drone and then adb in and do voxl-inspect-services which services are not enabled and running that you think should be? In your earlier screen shot voxl-px4, and voxl-mavlink-server were both enabled and running. What other services do you think you need for flight? That's all that should be required for manual flight mode.

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      • Eric KatzfeyE Eric Katzfey

        @daniellee So when you power cycle the drone and then adb in and do voxl-inspect-services which services are not enabled and running that you think should be? In your earlier screen shot voxl-px4, and voxl-mavlink-server were both enabled and running. What other services do you think you need for flight? That's all that should be required for manual flight mode.

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        daniellee
        Contributor
        wrote last edited by
        #13

        @Eric-Katzfey I understand that but do you know why the controller inputs arent being received by the drone? We have no idea what is causing this.

        Eric KatzfeyE 1 Reply Last reply
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        • D daniellee

          @Eric-Katzfey I understand that but do you know why the controller inputs arent being received by the drone? We have no idea what is causing this.

          Eric KatzfeyE Offline
          Eric KatzfeyE Offline
          Eric Katzfey
          ModalAI Team
          wrote last edited by
          #14

          @daniellee I don't know what that means. If you can see the RC sticks / switches at QGC then PX4 has to be seeing them. What happens when you try to arm the drone from QGC?

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          • Eric KatzfeyE Eric Katzfey

            @daniellee I don't know what that means. If you can see the RC sticks / switches at QGC then PX4 has to be seeing them. What happens when you try to arm the drone from QGC?

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            daniellee
            Contributor
            wrote last edited by
            #15

            @Eric-Katzfey It gets armed but the drone does not fly/respond to the controller inputs.

            Eric KatzfeyE 1 Reply Last reply
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            • D daniellee

              @Eric-Katzfey It gets armed but the drone does not fly/respond to the controller inputs.

              Eric KatzfeyE Offline
              Eric KatzfeyE Offline
              Eric Katzfey
              ModalAI Team
              wrote last edited by
              #16

              @daniellee Ah, okay, now we're getting somewhere. If it is arming that means you see the propellers spinning? Can you send me the log file from px4? (Look in /data/px4/logs).

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              • Eric KatzfeyE Eric Katzfey

                @daniellee Ah, okay, now we're getting somewhere. If it is arming that means you see the propellers spinning? Can you send me the log file from px4? (Look in /data/px4/logs).

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                daniellee
                Contributor
                wrote last edited by
                #17

                @Eric-Katzfey Hi Eric Im not at the computer right now and the px4 logs are the same as the ones above, the props arent spinning even when armed on QGroundControl.

                Eric KatzfeyE 1 Reply Last reply
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                • D daniellee

                  @Eric-Katzfey Hi Eric Im not at the computer right now and the px4 logs are the same as the ones above, the props arent spinning even when armed on QGroundControl.

                  Eric KatzfeyE Offline
                  Eric KatzfeyE Offline
                  Eric Katzfey
                  ModalAI Team
                  wrote last edited by
                  #18

                  @daniellee I don't see any log files attached in this thread.

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                  • Eric KatzfeyE Eric Katzfey

                    @daniellee I don't see any log files attached in this thread.

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                    daniellee
                    Contributor
                    wrote last edited by
                    #19

                    @Eric-Katzfey I have the PX4 log files in a zipped folder but I do not see a way to upload them to the forum.

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                    • Eric KatzfeyE Eric Katzfey

                      @daniellee I don't see any log files attached in this thread.

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                      daniellee
                      Contributor
                      wrote last edited by
                      #20

                      @Eric-Katzfey Hello Eric I have downloaded the PX4 logs- I managed to get a link for one of the logs, the internal timestamp is messed up and I believe this is the most recent one. Here is the link : https://logs.px4.io/plot_app?log=db2c6cd3-f6c9-4bf8-b5bc-dc5ac185c752

                      Eric KatzfeyE 1 Reply Last reply
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                      • Eric KatzfeyE Eric Katzfey

                        @daniellee So when you power cycle the drone and then adb in and do voxl-inspect-services which services are not enabled and running that you think should be? In your earlier screen shot voxl-px4, and voxl-mavlink-server were both enabled and running. What other services do you think you need for flight? That's all that should be required for manual flight mode.

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                        daniellee
                        Contributor
                        wrote last edited by
                        #21

                        @Eric-Katzfey said in Issues with controller and drone:

                        In your earlier screen shot voxl-px4, and voxl-mavlink-server were both enabled and running.

                        Just to be clear, that image you are referencing was the second photo related to the voxl-inspect-services after I enabled and started the px4 service. The first photo shows it not enabled and not running.

                        Upon power cycling, I have to enable it every time we attempt to fly.

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                        • D daniellee

                          @Eric-Katzfey Hello Eric I have downloaded the PX4 logs- I managed to get a link for one of the logs, the internal timestamp is messed up and I believe this is the most recent one. Here is the link : https://logs.px4.io/plot_app?log=db2c6cd3-f6c9-4bf8-b5bc-dc5ac185c752

                          Eric KatzfeyE Offline
                          Eric KatzfeyE Offline
                          Eric Katzfey
                          ModalAI Team
                          wrote last edited by
                          #22

                          @daniellee This log shows a normal flight happening in altitude hold mode. RC inputs are coming in and motors are spinning. Was there some issue with the flight this log was captured from?

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