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Inconsistent Compasses Inconsistent

Posted by MikeG on November 9, 2014 at 4:08am

Apologies if I am being a numpty - all still new to me (but learning I hope).

On latest 3.14 pre-release on a Pixhawk clone board (Fixhawk). 

Great flight with latest firmware, lovely stable poshold with EKF enabled. No pre-arm checks for first 2 batteries and about 20 mins flying.

On 3rd battery swap, I get a pre-arm check for compasses inconsistent. Unplug batteries, leave a bit, plug back in (x2) then the error goes away. 

I have done a full compass calibration (over 1000 data points) and when it flies, there is no toilet bowl effect, flies straight and true.

Should I just ignore this? I know I can disable the compass pre-arm check and might have to if it continues to be an issue.

The internal compass has our of range values when calibrated (one is over 450) but external all within range.

Looked at logs but no errors show this as it is a pre-arm thing I think.

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Replies

  • Zakir July 13, 2015 at 6:24pm
    Any suggestions how to fix it?
  • MikeG November 14, 2014 at 10:38am

    Getting worse - took 8 connect/reconnect attempts to get rid of the inconsistent error. Flew perfectly for 2 batteries then 4 attempts on 3rd battery before it went away. 

    • Dave Jacob > MikeG June 1, 2015 at 5:48pm

      I'm also just now seeing the same compass inconsistent error (comes and goes) after using the iris+ for six months or so. Is there a timeline for a resolution for this issue? 

      • Steve Foster > Dave Jacob June 13, 2015 at 11:10am

        I'm having compass problems too. Just started yesterday (6/12) I've tried reloading parameters, and everything I can think of. Mission Planner only shows one compass, and it locks up on calibration, at only 3 samples. Was locking up at 6 samples, now only 3. What the heck is going on? I have another Iris+, and it calibrates fine.

        • Chris Maier > Steve Foster June 13, 2015 at 2:03pm

          Having a similar issue... see the latest post on my thread HERE

  • MikeG November 10, 2014 at 4:33am

    Recalibrated compasses and still get this 1 in 3 battery changes. 

    Any ideas what to try next?

    • Rob_Lefebvre > MikeG November 10, 2014 at 4:58am

      Hi Mike, I get this too.  I think it's an issue that needs to be fixed, so hold tight.

      • Anthony Russell > Rob_Lefebvre December 17, 2015 at 5:28am

        Hi there guys,

        Just coming back on this as it has been a year and I too have this issue. Is there any thoughts on a fix here?

      • MikeG > Rob_Lefebvre November 10, 2014 at 5:05am

        ^^ Huge thumbs up - thank you Rob. Was assuming I had been an idiot ... again :)

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