Discussions

Magneto offsets

Posted by Michael Munson on March 1, 2011 at 11:26am
Okay - I am getting very frustrated here - I thought I was having trouble with my sparkfun magneto so I ordered a DIY - Only to have the same problem - Last flight I was unable to use CLI to determine my offsets - The last number always stays -2048 no matter how I turn it -

Mike

Little more info - My compass offsets used to be as follows: 395, -85, 11.5
Now they are reading 395, 187, -2048
If I move the magneto around there is no change in these numbers - Thanks guys

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Replies

  • Michael Munson March 5, 2011 at 7:52am

    Thanks Chris - I did not have anything connected and it was still doing it just sitting here

     

    Thanks

    Mike

  • Chris Card March 4, 2011 at 9:53pm
    I watched your test video...
    I too have had some weird trouble like yours while doing bench testing.
    Hopefully what I discovered may be helpful.

    After investigating I found that the 5 volt power on the APM system was dropping to low when servos were connected when using the usb port, causing a reset or brown out.

    I connected my power supply to the APM power input and I found that the servos, even with no mechanical load, could cause the current to exceed 2 amps briefly.
    With the USB connected and a RX NiCad battery pack connected to the receiver to supply extra power for the servos, the problem almost went away... As the battery pack voltage dropped the problem reappeared.

    So, I de-soldered the jumper that connects APM board power to the positive on the servo connectors.
    Problem gone.
  • Hari March 4, 2011 at 1:59am
    3690860374?profile=originalMy magnetometer shows this reading. Should i buy new 1??
  • Michael Munson March 2, 2011 at 8:22pm

    Mine was no Mag error - It did exactly the same thing with a brand new mag - One was a sparkfun one was a DIY - One did exactly the same thing on 2 different APM's as well- Has to be the oilpan or a faulty new mag - But this board is also a foxtrap - they have been plagued with problems -

     

    Mike

     

    Mike

  • Christopher Cooper March 2, 2011 at 7:13pm
    Mine's doing this too! I've just ordered another mag as I assumed it might be broken.

    I've removed all the metal screws from nearby, and it still happens.

    Sometimes in CLI the coordinates (not offsets) stop changing entirely, and start again when I tap on the mag board! Maybe I'll go through and reheat all the joints.

    Chris
  • Michael Munson March 2, 2011 at 4:40pm

    Thanks randy - That was my triple check - I reheated all the pins on the oilpan - twice to make sure - Weird thing is I have been flying this for months with no issues -

    Mike

  • Michael Munson March 2, 2011 at 4:10pm

    Thanks Randy - I triple checked all solder joints and still no go - I have to touch that pin in order to get the green light on the oilpan - Thanks

     

    Mike

  • Michael Munson March 2, 2011 at 11:21am

    Maybe this will trigger some idea what is going on

    http://www.vimeo.com/20566247

     

    Mike

  • Michael Munson March 1, 2011 at 7:24pm

    Thanks guys - What I am finding even when I move the mag around not mounted - it still is saying -2048 on the z - I think my oilpan is toast - Now the green light isnt even coming on the oilpan - Not sure what direction to go now -

     

    Mike

  • Developer
    Doug Weibel March 1, 2011 at 4:16pm

    Yeah, but Randy he said he has had the same problem with 2 magnetos. 

     

    I wonder if you have something fairly magnetic on your frame that has been repositioned closer to the maggy.  Even with your "good" values you had an offset of 395, which is really high.  That is like 80% of the earth's magnetic field strength in my location.

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