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GPS Loiter, why why why

Posted by Duran - ALTI on November 3, 2011 at 9:32am

Hello again all, any help here would be much apreciated.

 

I am flying a droidworx octo HL and flown over 300 perfect flights with Arducopter since .42, now running .49

 

I've got GPS and SONAR, alt hold with sonar works great, but GPS is acting funky, our rig if purpose built for aerial photo/video (seen recent vid here http://vimeo.com/30957186) and been flying solid for a long time now, but never really messed with GPS, I've only recently put it on to play around and possibly have RTL as a safety feature.

 

When flying around for a while, then hovering and switching to loiter, it imediatly want to head left, and then does a massive ass circle shape, like 50-70m, this is not loitering, lol. Everytime i enable loiter it wants to do the same thing, at first i thought is was circle mode, but have checked and re-checked the modes, it's loiter, the logs also read as loiter in google earth.

 

The strage thing is that the logs show the exact spots where i am flying, very acurately in fact, but I don't get why it does not want to hold the spot, but instead fly off ???

 

Here what it does, before I quickly switch back to stab as it just carries on

 

3690896920?profile=originalthe white dots are where i enable loiter.

 

My settings at loiter P 2 (have tried 1, and less, does the same thing)

Nav P all at defualt, can anyone give me some insight into this ? Is there a specific way the GPS must sit in relation to the APM board, direction etc ? I've changed it as well, same thing.

 

Any ideas ???

 

 

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Replies

  • Duran - ALTI November 7, 2011 at 12:41pm

    ALos, has anyone tried using the Mikrokopter GPS board with the Ardupilot Mega  kit ? I have a MK gps (LEA 6s Ublox) GPS and it also has the 5 wire plug , ideas ??

  • Duran - ALTI November 7, 2011 at 12:13pm

    3692298169?profile=original

    Hey again, I've sorted out the issues I was having (missing a - for the negative declination lol)

     

    So loiter is working but still creating fairly large circles, this screenshot is 25m form end to end, and gets bigger as the copter goes.

     

    Any ideas what setting would work well, it's a droidworx AD-8 octo with camera mount, so pretty large, it flies rock soild but loiter could do better I think ?

     

    Currently on default PID. Any suggestions ??

     

     

  • John C. November 3, 2011 at 10:13am

    GPS can sit in any direction.

     

    Have you done the GPS test in the CLI?  Does it provide accurate coordinates?

     

    There have also been some changes to loiter recently.  You may want to review the Git repo, and see if you want to try .50

  • Aurelio R. Ramos November 3, 2011 at 10:11am

    I think the problem is ultimately related to the magnetometer, or the way it is calibrated, etc. Can you check how well your magnetometer works?

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