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  3. Preflight Fail: Compass Sensor 0 missing

Preflight Fail: Compass Sensor 0 missing

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  • Nitin Varma VegesnaN Nitin Varma Vegesna

    @Eric-Katzfey Ok, also is there a way to buy the GPS chip since I did not see it on the available products?

    Eric KatzfeyE Offline
    Eric KatzfeyE Offline
    Eric Katzfey
    ModalAI Team
    wrote on last edited by
    #6

    @Nitin-Varma-Vegesna I think it's this one: https://store.3dr.com/mini-gps-ublox-max-m10s/

    Nitin Varma VegesnaN 1 Reply Last reply
    0
    • Eric KatzfeyE Eric Katzfey

      @Nitin-Varma-Vegesna I think it's this one: https://store.3dr.com/mini-gps-ublox-max-m10s/

      Nitin Varma VegesnaN Offline
      Nitin Varma VegesnaN Offline
      Nitin Varma Vegesna
      Contributor
      wrote on last edited by
      #7

      @Eric-Katzfey Ok, thank you!

      1 Reply Last reply
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      • Eric KatzfeyE Eric Katzfey

        @Nitin-Varma-Vegesna None

        Nitin Varma VegesnaN Offline
        Nitin Varma VegesnaN Offline
        Nitin Varma Vegesna
        Contributor
        wrote on last edited by Nitin Varma Vegesna
        #8

        @Eric-Katzfey Now, it arms successfully, even though it says Preflight Fail: heading estimate not stable and Preflight Fail: Yaw estimate error. Is this an issue?

        Eric KatzfeyE 1 Reply Last reply
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        • Nitin Varma VegesnaN Nitin Varma Vegesna

          @Eric-Katzfey Now, it arms successfully, even though it says Preflight Fail: heading estimate not stable and Preflight Fail: Yaw estimate error. Is this an issue?

          Eric KatzfeyE Offline
          Eric KatzfeyE Offline
          Eric Katzfey
          ModalAI Team
          wrote on last edited by
          #9

          @Nitin-Varma-Vegesna If you are just flying in manual or altitude hold modes then those shouldn't be an issue.

          Nitin Varma VegesnaN 2 Replies Last reply
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          • Eric KatzfeyE Eric Katzfey

            @Nitin-Varma-Vegesna If you are just flying in manual or altitude hold modes then those shouldn't be an issue.

            Nitin Varma VegesnaN Offline
            Nitin Varma VegesnaN Offline
            Nitin Varma Vegesna
            Contributor
            wrote on last edited by
            #10
            This post is deleted!
            Nitin Varma VegesnaN 1 Reply Last reply
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            • Nitin Varma VegesnaN Nitin Varma Vegesna
              [[topic:post-is-deleted]]
              Nitin Varma VegesnaN Offline
              Nitin Varma VegesnaN Offline
              Nitin Varma Vegesna
              Contributor
              wrote on last edited by
              #11
              This post is deleted!
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              • Eric KatzfeyE Eric Katzfey

                @Nitin-Varma-Vegesna If you are just flying in manual or altitude hold modes then those shouldn't be an issue.

                Nitin Varma VegesnaN Offline
                Nitin Varma VegesnaN Offline
                Nitin Varma Vegesna
                Contributor
                wrote on last edited by Nitin Varma Vegesna
                #12

                @Eric-Katzfey What about autonomous control indoors, and how could that be fixed if it's an issue? This is with a new GPS as well. Do I have to configure anything? Also, for the EKF2_GPS_CTRL, I reset to default: 7

                Nitin Varma VegesnaN 1 Reply Last reply
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                • Nitin Varma VegesnaN Nitin Varma Vegesna

                  @Eric-Katzfey What about autonomous control indoors, and how could that be fixed if it's an issue? This is with a new GPS as well. Do I have to configure anything? Also, for the EKF2_GPS_CTRL, I reset to default: 7

                  Nitin Varma VegesnaN Offline
                  Nitin Varma VegesnaN Offline
                  Nitin Varma Vegesna
                  Contributor
                  wrote on last edited by Nitin Varma Vegesna
                  #13

                  @Eric-Katzfey Screenshot 2026-02-03 at 11.46.43 PM.png

                  Here is an image of when I start autonomous exploration (not flying yet) but moving it with hand, I am getting these preflight errors that I used to not get.

                  This is with SYS_HAS_GPS, and SYS_HAS_MAG to 1, EKF2_MAG_TYPE = Automatic, EKF2_GPS_CTRL = 7

                  Also, voxl-inspect-gps is saying NO GPS for fix type:

                  dt(ms) |fix type|Sats|Latitude(deg)|Longitude(deg)| Alt(m) |Vel(m/s)|HorErr(m)|AltErr(m)|
                  129.5 | NO GPS | 0 | 0.0000000 | 0.0000000 | -17.0 | 0.00 | 4294967.295 | 4092465.408 |^C

                  Eric KatzfeyE 1 Reply Last reply
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                  • Nitin Varma VegesnaN Nitin Varma Vegesna

                    @Eric-Katzfey Screenshot 2026-02-03 at 11.46.43 PM.png

                    Here is an image of when I start autonomous exploration (not flying yet) but moving it with hand, I am getting these preflight errors that I used to not get.

                    This is with SYS_HAS_GPS, and SYS_HAS_MAG to 1, EKF2_MAG_TYPE = Automatic, EKF2_GPS_CTRL = 7

                    Also, voxl-inspect-gps is saying NO GPS for fix type:

                    dt(ms) |fix type|Sats|Latitude(deg)|Longitude(deg)| Alt(m) |Vel(m/s)|HorErr(m)|AltErr(m)|
                    129.5 | NO GPS | 0 | 0.0000000 | 0.0000000 | -17.0 | 0.00 | 4294967.295 | 4092465.408 |^C

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

                    @Nitin-Varma-Vegesna If you re-install or update your SDK to the latest it will properly set all of the parameters.

                    Nitin Varma VegesnaN 1 Reply Last reply
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                    • Eric KatzfeyE Eric Katzfey

                      @Nitin-Varma-Vegesna If you re-install or update your SDK to the latest it will properly set all of the parameters.

                      Nitin Varma VegesnaN Offline
                      Nitin Varma VegesnaN Offline
                      Nitin Varma Vegesna
                      Contributor
                      wrote on last edited by
                      #15

                      @Eric-Katzfey I would rather not delete everything outside of /data/, is there a way to reset the params of px4 another way? This issue only happens when I start exploration, and I move the drone up with my hand slightly, but why do I get FCU: Vision Failure.

                      Eric KatzfeyE 1 Reply Last reply
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                      • Nitin Varma VegesnaN Nitin Varma Vegesna

                        @Eric-Katzfey I would rather not delete everything outside of /data/, is there a way to reset the params of px4 another way? This issue only happens when I start exploration, and I move the drone up with my hand slightly, but why do I get FCU: Vision Failure.

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

                        @Nitin-Varma-Vegesna You can set parameters via voxl-configure-px4-params.

                        Nitin Varma VegesnaN 1 Reply Last reply
                        0
                        • Eric KatzfeyE Eric Katzfey

                          @Nitin-Varma-Vegesna You can set parameters via voxl-configure-px4-params.

                          Nitin Varma VegesnaN Offline
                          Nitin Varma VegesnaN Offline
                          Nitin Varma Vegesna
                          Contributor
                          wrote on last edited by
                          #17

                          @Eric-Katzfey That is what I did to reset the params prior to this happening.

                          Eric KatzfeyE 1 Reply Last reply
                          0
                          • Nitin Varma VegesnaN Nitin Varma Vegesna

                            @Eric-Katzfey That is what I did to reset the params prior to this happening.

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

                            @Nitin-Varma-Vegesna Well, that's why I asked you to do the full SDK installation. If you install the SDK and set it up as we do from the factory then it should be working like when you first got it. If it doesn't then that potentially points to some damage caused by the crash and not some configuration change you have made since then.

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