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ArduPilot Compass

Posted by Casey on July 7, 2013 at 9:56am

I am trying to get the HMC6343 compass module (https://www.sparkfun.com/products/8656) working on my ArduPilot. However, I am coming across an odd problem. When I cut the trace to disable the built in compass module it keeps on working as if i never made the cut. I double checked my cut with a DMM and was seeing about 1.2MOhm between the two sides of the jumper. Any ideas what is going on?

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Replies

  • Marnix Verschraegen April 11, 2015 at 4:13pm

    I have the same problem on my APM 2.5 i cut the trace but still it seems that the compas still works when i move the APM i see my yaw moving in flight data. But when i try to do a compas calibration i have no data comming in.

    I also have a second problem. Whele cutting i removed and lost the SMD component Just beneath the two pads where i needed to cut

    I used a photo i took from a youtube clip to vusualize where this component was installed. Can someone tell me if this is an important component. Do i need to install it back or can i leave it off

    https://dl.dropboxusercontent.com/u/32948187/Naamloos.jpg

    Also because i lost it i need to know what it was ?

    Hope someone can help here ...

    /\/\ax2206

  • Moderator
    Graham Dyer September 15, 2013 at 2:25am

    I have the same problem which I originally thought was mine alone, but I see others are having the same.

    Check which way the compass points each time you boot up, if it's always roughly north then the compass IS disconnected and I suspect the HUD is getting some of it's rotational data from the inertial nav system rather than from the (disconnected) compass so it 'appears' that the compass is still working.

  • Josh Potter September 14, 2013 at 6:58pm

    I had the same problem.  I then took the chip off however that doesn't allow my external compass to work.  I don't think there is a true APM2 fix.

  • Richard (DK) July 7, 2013 at 10:38am

    test compass in MP (terminal).

  • Admin
    Thomas J Coyle III July 7, 2013 at 10:04am

    @Casey,

    Are you sure that you are cutting the correct trace on your APM2.5? I have attached outboard compasses to two of my APM2.5s and was always successful cutting the trace to disable the on-board compass.

    You followed these Wiki instructions: http://copter.ardupilot.com/wiki/common-external-magnetometer-for-i... ?

    Regards,

    TCIII

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