My compass is reversed ! - how can that be ?

When the nose of my quad points south,  the Planner (or copertGCS) say North.  - all directions are good, but wrong.

The APM2 is mounted so that the SD card is in front left corner. - and GPS up, of course, do please don't ask that :)

it flies well, - but needless to say is useless to position hold, RTH.

how is this even possible ? - I recalibrated Compass, and also flew with learning on - does not help - the directions are good, but rotated 180degrees.

Firmware 2.5.4.

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Replies to This Discussion

Permalink Reply by jacekheli on May 18, 2012 at 11:09pm
Andke, two days ago my quad with apm2, 2.5.4 software ver flight away. After take off I switched to PH and wait a few minutes. The wind about 10-15 km/h. Returning to stabilize the quad was not horizontal but I could comeback. After landing take off again the trim was correct.

Again switched to PH and moved the stick to fly. After one or two minutes I could not return to horizontal position and switch on RTL. The quad didn't comeback still being tilted about 45 degrees. Again switch to stabilize but run out of the swing bar. Finally the quad flight away with remaining run time of battery above 20 mins. Pity it was fully carbon without any compromises.


For sure compass direction was correct and well calibrated. Unfortunately on that day I removed xbee and minim osd and have no any record and to find the quad is slightly impossible. Within this weekend I will try the second quad but 2.5.5 ver.

It seems that we have the same symptoms excluding problem with compass direction.

3D RoboticsPermalink Reply by Chris Anderson on May 18, 2012 at 11:40pm

@Jacekheli: Very sorry to hear that. We did try to alert everyone to upgrade to 2.5.5 (which resolves the issue with the accel scaling in some boards, which may have been what you encountered), but perhaps you missed the announcement at the time. If you PM me, I can arrange for you to get a replacement APM 2 board at a developer's discount. 

Permalink Reply by jacekheli on May 19, 2012 at 12:00am
Dear Chris, many tanks. Unfortunately I'm working in China and bought several apm1, 2, and Chinese dev. capm 3,3 in domestic market and used them. Btw the apm2 looks much more better then the previous one maide in China. No problem with uploading code and not required any changes via Arduino like gps protocoll or compass orientation.
That is right I missed the workings in the forum and it cost me to lose lovely toy.
Thanks for your great support.

3D RoboticsPermalink Reply by Chris Anderson on May 19, 2012 at 12:10am

Ah. The ones made/sold in China are pirated and are of unknown quality and not supported.

All official APM 1s and 2s are made in the US (3D Robotics in San Diego and Sparkfun in Colorado) and only sold through those companies or authorized distributors (of which there are none in China).

Permalink Reply by jacekheli on May 19, 2012 at 12:33am

Yeah, the Chinese pirates... But now I have no choice. I want to fly and take pictures and movies. Can not wait, the spring exploded now in Dalian and after long winter the desire is much more stronger.

http://www.youtube.com/watch?v=BFecOb-L5iE

Permalink Reply by jacekheli on May 19, 2012 at 8:44pm
Chris the ver 2.5.5 working well. After many tests no any previous problems. I'm using retro loiter but the position I have in ~ 10 m circle. Is it safe to use normal loiter?
Permalink Reply by Andke on May 19, 2012 at 12:04am
Thank you. 2.5.5 did not exist at the time of the crash.
Permalink Reply by Andke on May 19, 2012 at 12:06am
Oops, sorry. Thought you write to me, just forget the comment, the thank you and date of accident.
Permalink Reply by Andke on May 19, 2012 at 12:14am
Hi. Yes, what you describe sounds very familiar, the levelling problem gradually takes more and more input to counter, until landed. I were using soft rubber dampers, and there were no sign of too much vibrations.
Sorry to hear about your loss, take the discount offer, and hope you find the quad, dry. : )
Permalink Reply by jacekheli on May 19, 2012 at 12:25am

Andke, I have the foamy dumpers and the box is mounted flexible as well. When I run those engines, on the graph has no hazard. 

The discount being in China is not easy to use, so many custom duties... I will run the experiment with local producer.

Attachments:
Permalink Reply by Tommy Larsen on May 30, 2012 at 3:04am

Maybe the APM want to go the other way around the earth to get to the target ...?

Permalink Reply by Andke on May 30, 2012 at 3:06am

yes, it's important to note, that this error is not reproducible on another APM2 shield - it's clearly caused by that magnetometer not working correctly. - other APM2 works fine.

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