Discussions

Constant Yaw issue

Posted by Shawn on July 8, 2011 at 8:18am

Hello, I have loaded the latest (2.0.33) code and used both mission planner and CLI to do the setup, but even though I can take off and have a level flight, the copter is rotating constantly clockwise...I have about no control over the yaw.

I am using the DIY mag and also have a sonar attached.

Any ideas?

 

P.S. My mag is attached as follows:

Components Up, Pins Forward

 

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Replies

  • Rob. S July 11, 2011 at 11:09pm

    i have the same issue

    i enable compass and i even do the offsets manually

    i go for first flight after that it flys alright as soon as i land it starts goin ccw 45,90,180 degrees on takeoff

    i turn the compass off and the copter flys great.

    to me it looks like some how the compass rests and puts in default offsets.
    can i still do loiter and alt hold without the compass????

  • Kirill July 10, 2011 at 12:29pm

    Did anyone solve the issue? Or just have any new ideas?

  • Coby July 10, 2011 at 8:48am

    Lots of entries in the ArduPirates RC Groups build log thread over the last few months about yaw control issues using their firmware.  For most of us it ended up being more of a mag mounting issue.  I remoted mine using a short cable and mounted using two layers of Futaba gryo tape with a thin aluminum spacer between layers.  Corrected many yaw control issues I was having. 

     

    There were also issues with error feedback if you would takeoff/land with a slight yaw rate/takeoff again without resetting power to initialize sensor calibration.  Not sure where some of this stands now as I have been out of the ArduPirates loop for a few weeks.

     

     

  • emile July 10, 2011 at 12:07am
    What do you see in the mission planner? Is the heading value still or is it moving (watch also the numbers)?
    Also check compass offsets. I have seen that offsets go to very high values (in the order of +- 250) after some flights, so I always check them and eventually reset them by disabling/enabling the compass.

    Hope this helps.
    Emile
  • Sasha July 9, 2011 at 12:59pm

    after upload cant open .rar myself... says access denied..  here's uncompressed

    09-07-11 09-53 1.log

  • Kirill July 9, 2011 at 12:26pm
    Have a look at my log, too, please.

    log.log

  • Sasha July 9, 2011 at 12:02pm

    Ok pressed ''download all logs'' here it is...

     

     

  • Sasha July 9, 2011 at 11:40am

    Hi, its says ''logs enabled'' but says ''no logs'' but i was flying today...hmm

    Strange thing i was flying GPS unplugged yesterday perfecly without any oscilations and vibration perefecly hovering... and today YAW was crazy and can't do nothing. I got good quality HExa frame from here: http://coptersky.com/index.php?page=shop.product_details&flypag... also got a little video of it here but on 2.0.32... https://www.youtube.com/CAHEK2008#p/a/u/1/8QnycjqWGf4 here's some pictures also with me flying. 3692235454?profile=original

    3692235505?profile=original3692235368?profile=original

  • Kirill July 9, 2011 at 11:28am
    I have the same issue with yaw, however it appears accidentally and I found out recently in what casesexactly.
    I power on the quad and if I start to take off with this heading it tries to move 45-60 degrees clockwise, but if I rotate my quad 90 degrees ccw, it takes off without yaw. The same appears after landing and new take off effort.
  • Developer
    Jason Short July 9, 2011 at 10:24am

    Try the latest version. I have a totally new Yaw control. It's in the downloads section. Be careful, it may have a few bugs. Just fly Simple or Stabilize if you don't want to do too much preflight testing.

    It's still no substitute for crooked motors though, please verify the motors are perfectly vertical.

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