Discussions

2.0.8

Posted by Nigel on May 23, 2011 at 4:30am

Just downloaded 2.0.8 from the planner.  The winds here in the UK are making a real nuisance of themselves at the moment but despite the weather I was able to do a brief test and it flew okay in Stable mode.  However, I see that the yaw 'unwinding'* issue is still there.  Several people have mentioned this and yet it has remained a small but noticeable problem for some time.  Would it help if I made a short video of the problem so that the project team can see what is happening or is it a known and difficult issue to resolve?

Nigel

 

* The yaw unwinding issue as far as I'm concerned is where you provide a yaw command, the copter then rotates but when you release the rudder stick the copter rotates back in the direction it had come from around 10 or 20 degrees.

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Replies

  • Flávio Henrique P. de Oliveira May 26, 2011 at 7:04am
    I'm trying to fly with 2.08 but I aways have the same problem: motors wont rise together when I increase throttle. When I upload the code from planner (0.4.35) it works fine, but when I download from arducopter download section "Arducopter 2.0.8.zip", compile and upload, it doesn't work properly.
    The reason I need to use from source is that I'm using RFBee and not XBee for telemetry because RFBee doesnt have 57kbps, only 38kbps.
    I'm used to the setup process and everything is very well configured, I'm sure there is something in the code or in default PID that makes it happen. When I download from planner it works fine, but I don't have telemetry...
    Here is a picture of my sensors just after power on and arm motors:

    motorThrottleArducopter2.08.png

  • Developer
    Jason Short May 23, 2011 at 6:31pm

    I'm going to implement an alternative (not as fancy) yaw control tonight. I'll put a compiler option in the APM_Config.h and you can try alternate ways. That'll help me sort this thing out for good. 

    I also added better Yaw logging today to help as well. If you have log issues, please erase your logs. That seems to help.

    Jason

  • Christopher Cooper May 23, 2011 at 5:24pm
    We're up to 2.08 already?? I break my quad and the whole world moves on while I'm waiting for replacement parts!
  • John Hanson May 23, 2011 at 4:04pm
    I noticed same thing with 2.08, yaw likes to go back (mag is enabled).,and sonar altitude is not stable (loaded Ardupirate code on this unit and it flies incredibly well, less than .5" wobble in sonar altitude)   I also tried CH 7 switch  (very confused when this is properly used) with no effect on altitude stablility
  • Russell B. Sutton May 23, 2011 at 2:35pm

    Hey Nigel,

     

    Ok yea i see what your are talking about.  I noticed this to with the PiratesNG,  I haven't been able to fly for the last 4 wks,  SO i haven't been able to do any flight test with new AC2.  I have noticed that the compass is becoming more and more accurate with every new AC2 firmware update though.  Like Dani When I was using the Pirates code if i diabled the compass the yaw control seemed to function alto crisper.   Has changing the YAW PID's mad any difference or do you think it has something to do with the code?

     

  • Limebear (Rob) May 23, 2011 at 6:39am

    Hi Nigel,

    Interested to hear that you've tested 2.0.8 ok, I might be tempted to upgrade from 2.0.5 now, I was holding off because of some of the scary bug reports in the last week.

    Yes the wind is a nuisance isn't it, I'm in Southampton and it hasn't really let up all week.

    Do you know if the 2.0.8 version now has motor LEDs turned on by default? Jason added support in 2.0.6 but turned off by default, and I saw a report that when someone tried to turn them on they got a compile error.

    Rob

     

  • Russell B. Sutton May 23, 2011 at 4:45am

    I would like to see a video Nigel.

     

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