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Strange acceleration reading

Posted by shai on August 22, 2015 at 1:19pm

Hello,

 

I downloaded the flight logs from my Pixhawk through the Mission Planner Software and saw something strange.

While the X and Y Acceleration Graphs where centered around 0, the Z Acceleration was centered around -10.

logs.png

Is this normal?

What can be the cause?

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Replies

  • Brian Kling August 22, 2015 at 2:12pm

    Yep. Gravity.

    • shai > Brian Kling August 23, 2015 at 12:09am

      Thanks for your reply!

      As you can see, the Pixhawk enters into FAILSAFE_GCS-1 and later FAILSAFE_GCS-0.

      What is the reason?

      What does each failsafe mode mean?

      • Brian Kling > shai August 23, 2015 at 7:53pm

        Ground Control Station Failsafe.

        http://copter.ardupilot.com/wiki/gps-and-gcs-failsafes/

        • shai > Brian Kling August 24, 2015 at 3:48am

          Thanks for the information.

          But I'm still having trouble understanding the graph.

          Please walk me through it...

           

          Around time 25 the following error kicks in:

          Err: FAILSAFE_GCS-1

          It disappears around time 60.

           

          Then around time 100 the following error kicks in:

          Err: FAILSAFE_GCS-0

          It disappears around time 135.

           

          Then around time 150: FAILSAFE_GCS-1 reappears.

           

          Can you explain exactly what's happening?

           

           

          • Brian Kling > shai August 24, 2015 at 6:11pm

            I can't say what the difference between FAILSAFE_GCS-0 and FAILSAFE_GCS-1, but in either case, the communications between your ground control station and the machine has been lost. Maybe someone else knows what the difference is.

            Since telemetry is non-critical (usually), you can turn it off in Mission Planner. Set FS_GCS_ENABLE to 0.

            • shai > Brian Kling August 25, 2015 at 12:34am

              Thanks for your help.

              This is really frustrating. I can't find any information about the  

              FAILSAFE_GCS-0, FAILSAFE_GCS-1 errors.

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