No good in loiter and RTL, just sometimes?

Hello,

I have an APM2.5+ with the Mediatek 3329 V2.0.

My octocopter flies well in stab, but has very strange behavior in Loiter and RTL. At first I was sure it was just me not beeing able to dial in the PIDs, but me and an APM-using friend have spent weeks with it now. Two days ago, I got it Loitering pretty perfect by changing the Loiter-I to 0.1 (BIG octocopter) and Loiter-P to 2.

I was so happy! RTL also worked as expected. I even changed the values back to confirm that it again would start to misbehave, and it did! Overshooting, going back and forth etc, just way off target by 10-meters and generally acting confused. Then the batteries ran out.

The next day I set the values back to what had worked so well the day before.

But now, it was bad again. Acting differently though. I took it up to about 10 meters, about 20 meters away from me. Looking at Mission planner and the log, it shows that I had left the park area (green) and flown all the way to the housing area, over 100 meters away. Still, I had at least 9 satellites! This went on for minutes? Not just a glitch. 

Anyway, I'm thinging my Meditek is up to no good, and that might be why Loiter and RTL are so bad too.

In the pic below, not that I was never outside the inner half of the white cirle.

Logs attached.

Hoping someone can take a look at the logs and maybe find something wrong. I don't mind buying a better GPS if I know that it will help. 

3691047591?profile=original

Kind Regards,

Magnus, Sweden

2013-08-09 14-23-03.tlog

2013-08-09 14-23-03.rlog

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Update: I was at a friends house, and he loaned me his RCTimer GPS from the Arduflyer kit.

    We went out into the filed and took it up, it was pretty windy. Loiter was SPOT ON! 

    There is clearly something fishy going on here!

This reply was deleted.

Activity

DIY Robocars via Twitter
Sunday
DIY Robocars via Twitter
Saturday
DIY Robocars via Twitter
Saturday
DIY Robocars via Twitter
RT @f1tenth: Say hi to our newest #F1TENTH creation for @ieee_ras_icra next week in Philly. It’s going to be huge! 😎 🔥 @AutowareFdn @PennEn…
Saturday
DIY Robocars via Twitter
May 11
DIY Robocars via Twitter
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Noticed my car zigzagged in last run. It turned out to be the grass stuck in the wheel and made the odometry less accura…
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Test my car. RTK GPS worked great. Thanks @emlid for their support. https://t.co/EkQ6qmjmWR
May 8
DIY Drones via Twitter
RT @chr1sa: @kane That's @diydrones circa 2009. Still have a box of those Canon cameras that we used to strap into planes, just like this.…
May 3
DIY Robocars via Twitter
RT @chr1sa: Our next @diyrobocars race is going to be outside at a real RC racetrack in Fremont on May 28. Fully autonomous racing, head-to…
Apr 30
DIY Robocars via Twitter
RT @f1tenth: Our Spring 2022 F1TENTH course @PennEngineers is coming to an end with a head-to-head race as a big finale. So proud of our st…
Apr 26
DIY Robocars via Twitter
RT @DanielChiaJH: I wrote a thing! Throughout the development of my @diyrobocars car I've been using @foxglovedev Studio to visualize and d…
Apr 23
DIY Robocars via Twitter
RT @SmallpixelCar: My new car for high speed. Low body, everything ( @NVIDIAEmbedded Jetson Xavier NX, @emlid RTK GPS, IMC) under the deck…
Apr 23
DIY Robocars via Twitter
Apr 21
DIY Robocars via Twitter
RT @f1tenth: F1TENTH Race training setup @PennEngineers for our upcoming ICRA2022 @ieee_ras_icra competition. @OpenRoboticsOrg @IndyAChalle…
Apr 21
DIY Robocars via Twitter
RT @fatcatFABLAB: Proud to be hosting a restarted DIY Robocars NYC Meetup April 26. Come by if you want to talk about and race self-driving…
Apr 17
More…