Replies to This Discussion

Permalink Reply by Chris on January 11, 2012 at 5:24pm

Ive the same issue, but if i disable the mag, the heading is stable. if i enable the mag, the yaw is continuously changing. the declination is made.

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Permalink Reply by basshead on January 11, 2012 at 5:27pm

Damn, my usb connector just broke off, looks like im done testing for a bit unless I can get a small enough soldering iron to put this thing back on. I really really really want the new APM 2.0's to ship

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DeveloperPermalink Reply by Randy on January 12, 2012 at 5:15am

@Chris,

Could you try enabling your compass, running the CLI, test, compass and posting the results?  that will determine if your compass is broken.

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Permalink Reply by Chris on January 12, 2012 at 5:21am

Hey Randy

Compass is now enabled and tested in CLI. If i let my Copter stay on my desk, the values are staying too. if i move the copter about roll / pitch / yaw, the values are changing correct.

so my compass is okay, i think.

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DeveloperPermalink Reply by Randy on January 12, 2012 at 5:52am

Chris,

   ..you're saying that if you enable the mag, your yaw keeps changing and when you disable it it stops changing?!  I think perhaps what you're seeing is the temprary correction to your heading as the APM starts receiving data from the compass.  So imagine that your APM thinks it's heading north when you start it up...but the mag is enabled and in fact, the APM is facing south...it will take a while (maybe 15 seconds?) for the APM to correct the heading to point south.

     Can I ask, if you leave it for 3 minutes or so with the mag enabled, does it settle on a compass heading that's close-ish to the correct heading?

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Permalink Reply by Chris on January 12, 2012 at 6:04am

U can ask, thats why we write here. ;)

If i let my apm a while on my desk, the yawing is less, but it dont stops. the groundcourse and the yaw are spinning. after a while more less, but they do.

and, if i disconnect the apm, and dont move my apm, the heading is another. e.g: if i let the apm 3 min stay, it faces to north, maybe. if i reconnect the apm to the pc, the heading is maybe south. so, what is the compass doing there?

in CLI it is staying for hours in the same heading. after disconnect, the heading is another too.

i dont know the real heading, because ive no real compass.

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DeveloperPermalink Reply by Randy on January 12, 2012 at 6:22am

hmm...i have no idea.  I've spent a lot of time with the compass and APM and I've never seen what you're describing.

presumably erasing your eeprom doesn't help (start CLI, setup, reset)?

If that doesn't help, i'm afraid I'm out of ideas unfortunately!

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Permalink Reply by Chris on January 12, 2012 at 6:40am

Yep, ive erased the eeprom and so on. but doesnt work.

ive no more ideas.

Permalink Reply by Jay on February 18, 2012 at 12:28pm

My quad is doing the same thing as well...

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DeveloperPermalink Reply by Randy on February 18, 2012 at 5:51pm

@Jay,

     Do you have more details?  like the board you're using (presumably APM1).  Do you have a compass attached?  Is it a new build (i.e. you've always had the problem) or something that just started happening?

    My guess is that your compass is not functioning and so the natural drift of the yaw gyro is not being corrected (this is what the mag does).  If you connect your APM through the usb port, then click the AP Mission Planner's Terminal button, then enter test and compass and you should see the output of the compass...if you don't then it's likely miswired or perhaps broken.

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Permalink Reply by Jay on February 18, 2012 at 6:43pm

Yes I actually finished troubleshooting today and from the looks of it, it is the magnetometer. It starts to work, then sometimes it reports back 'not healthy' when doing test->compass in CLI. I've disconnected it and now I have the subtle natural drift in yaw but imu seems to be functioning correctly and stabilize is working so hopefully its just the magnetometer. I also noticed a bridge of solder on two joints of one of the smd chips on the magnetometer board. I emailed 3DR about it and waiting back to hear.

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