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DCM Bad Heading

Posted by SlyKittenBox on December 5, 2014 at 8:38am

I have no idea what is going on.  Everything was flying great and then I updated the firmware to 3.2 and now I keep getting DCM Bad Heading.  This unit only flew 3 times before I put 3.2 on it and it was working perfectly with 3.1.  IT does not matter what mode I have the unit in I get this message.  The unit keeps flying but very rough then poof it passes and it flies normal again.

http://youtu.be/fCXRKpAKPWo 

Here is the video file of what it says in mission planner as it flies.

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Tags: bad, dcm, heading
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Replies

  • Davide Negretti March 6, 2016 at 12:13pm

    Hallo at all, I have today the same message.I post my log files , someone can help me maybe? Thank's a lot.

    2.BIN

  • Richard Kennedy March 18, 2015 at 5:28am

    I had this problem after installing  pixhawk on a quad that had a pixhawk before with no issues so I knew it could not be proximity  to wires etc. I eventually re-did the compass-mot only 1/2 throttle not full throttle and that took care of the issue. Just an fyi

  • Christopher Sevilla January 15, 2015 at 1:59am

    Dear Friend, 

    I suggest you recalibrate your compass or you isolate your gps and compass better from interferences :), look at ekf failsafe and DCM page on the link : http://copter.ardupilot.com/wiki/ekf-inav-failsafe/

    hope it help

    • Rick McEwen > Christopher Sevilla January 30, 2015 at 11:36pm

      Thanks, Chris. I did both those things with no luck. Then I had a closer look at my GPS mast. I had a crash a few days earlier and had broken the mast. I thought I had glued it back in place, but the glue didn't take. I think what was happening was the GPS/Compass was rotating relative to the quad from vibration, and the discrepancy between the compass data and the GPS/EKF headings was causing the error. I did a better fix on the mast and the problem is solved...

      Thanks again for the replies, guys :)

  • pyrosamz January 9, 2015 at 4:03pm
    This happens when there is a discrepancy between compass heading and actual for more than a second. Move your gps compass module higher up on your frame away from batteries wires distribution esc's etc... Re do live mag calibration. Then also do a compassmot calibration. That should fix it.
    • Rick McEwen > pyrosamz January 10, 2015 at 8:09am

      Right on @pyrosamz did these two things and it has solved my problem.

      • pyrosamz > Rick McEwen January 10, 2015 at 5:41pm
        Your most welcome rick. :)
  • Rick McEwen December 28, 2014 at 7:17pm

    I'm experiencing this as well on my 3DR 2014 DIY Quad running APM 3.2 on Pixhawk.

    "DCM Bad Heading," shows up on the HUD and error message is read out audibly as well...

    Total newb here, so any help is much appreciated.

    2014-12-27 09-48-52 18.bin.log

    • Richard Evans > Rick McEwen January 6, 2015 at 12:55pm

         I also got a DCM bad heading in my Mission Planner. It seemed to trigger a sideways movement and a momentary cutoff of the motors when I switched from Stab to POS  (I have been routinely taking of in Position hold mode before now with no problem.)  

      . Being only about 15-20 feet from the ground, it hit a rooftop of a nearby structure and broke a few things

      I have flow a few times with 3.2 without a problem, but this seems to have happened when I switched from Stabilize mode, to Position mode.  at the moment I flipped the switch is when it cut the motors.

      I had 11 satellites and HDOP of - 1.9 

      not good!    I've attached a flash log in case someone can take a look and understand what happened..

      39.log

  • kevin kissinger December 14, 2014 at 12:21pm

    this is happening to me also.

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