3DR uBlox GPS with Compass - crazy mag offset readings

Hi,

I was having some problems with my quadcopter (running the APM 2.5) shooting off in random directions when I put it in Loiter or RTL modes.

After doing some reading I came to the conclusion that this was probably due to interference having an effect on the built-in compass on the APM. I bought myself a nice new 3DR GPS module with the built in compass thinking everything would b resolved, but when i've tried to do the compass calibration to give me the magnetic declination offset numbers, the numbers are so crazy that that the AMP won't allow me to arm.

I've tried it several times, even went out into the middle of a field to do it, but the numbers that are returned are up in the thousands.

If disconnect the Mag lead from the APM, and select 'onboard magnometer' in the MP, and do the dance again, i can get much more sensible numbers (inside the recommended -150 to 150). 

The problem with this is that my quad still shoots off at top speed in a random direction when i put it in Loiter.

Any suggestions???? I assume he new GPS with compass module is compatible with the APM 2.5?

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

Join diydrones

Email me when people reply –

Replies

  • The coexistence of on board compass and external compass give you very odd result of compass calibration.

    3692840525?profile=originalYou may not cut the trace of internal compass trace on APM 2.5. However, sometimes the internal compass is appears even three times CUT and confirmed by microscope. There is some APM2.5 board that could not disable on board compass by cutting "Jumper trace". 

    • I have the same issue. I have cut the trace, and tested with Ohm meter, that there is no connection. And the internal compas is still active. If this is correct, how do we disable the internal compass.   

      Thanks  HC

  • One additional question to go with Bill's request for pics. Did you cut the "Jumper Trace" for the internal magnetometer to disable it? I just did this on my APM 2.5 and it made a world of difference in the "Auto" modes.

    Link to instructions for cutting the trace: http://copter.ardupilot.com/wiki/common-external-magnetometer-for-i...

  • Developer
    Can you post a picture of your setup. It ususlly really helps with these kind of issues. Thx
This reply was deleted.

Activity

DIY Robocars via Twitter
Jan 28
DIY Robocars via Twitter
RT @Heavy02011: ⁦@diyrobocars⁩ : A Home-brew computer club* for Connected Autonomous Driving. talk at #piandmore ⁦@PiAndMore⁩ on Jan 23rd h…
Jan 23
DIY Robocars via Twitter
RT @a1k0n: New blog post! Deep dive into my ceiling light based localization algorithm which runs in 1ms on a Raspberry Pi 3: https://t.co/…
Jan 23
DIY Robocars via Twitter
Great new guide to using @donkey_car https://custom-build-robots.com/donkey-car-e-book-en
Jan 23
DIY Robocars via Twitter
RT @chr1sa: The next @DIYRobocars virtual AI race is tomorrow morn at 9:00am PT. You can watch live on Twitch https://www.meetup.com/DIYRobocars/events/275268196/
Jan 22
DIY Robocars via Twitter
New version of Intel OpenBot! This resolves many of the issues with the first version, including a much smoother tr… https://twitter.com/i/web/status/1352395636369313798
Jan 21
DIY Drones via Twitter
Using ArduRover with an RTK GPS https://ift.tt/2N9I3RO
Jan 18
DIY Drones via Twitter
Jan 18
DIY Robocars via Twitter
Jan 18
DIY Robocars via Twitter
Jan 15
DIY Robocars via Twitter
Jan 15
DIY Drones via Twitter
Jan 14
DIY Robocars via Twitter
RT @Heavy02011: @diyrobocars : A Home-brew computer club* for Connected Autonomous Driving on Jan 23rd, 2021 https://www.meetup.com/Connected-Autonomous-Driving/events/275728684/ #Meetu…
Jan 14
DIY Robocars via Twitter
Jan 14
DIY Robocars via Twitter
RT @Heavy02011: ⁦@diyrobocars⁩ Autonomous Driving Assembly at #rC3. join us at https://rc3.world/rc3/assembly/diyrobocars-f1tenth/ ⁦@f1tenth⁩ ⁦@DAVGtech⁩ ⁦@DWalmroth⁩…
Jan 11
DIY Robocars via Twitter
RT @chr1sa: New car designs coming for our next @DIYRobocars @donkey_car virtual race on the 23rd. Choose any one you want at race time Le…
Jan 11
More…