Replies to This Discussion

Permalink Reply by Marc on March 16, 2012 at 6:05am

hello david,

 

i used the mask but my arms and hands were red raw for a while, the things we do for our hobbies :)

 

Permalink Reply by Gord Likar on March 15, 2012 at 9:35pm

On the off chance, did you move closer to the lipo.  There was a posting a while back on magnetic interference from a lipo.  Can't remember when or where the posting was, but the it demostrated very strong fields from the lipo.  Some brands were worse than others.

Permalink Reply by Martin Szymanski on March 15, 2012 at 10:00pm

I would suppose a mag field could grow on a Lipo conductance near the Mho, I am not too sure of the capacitive reactance. i REMEMEMBER ELI the ICE man.

Permalink Reply by Gord Likar on March 15, 2012 at 10:30pm

Found the link. 

The post  http://diydrones.com/forum/topics/demo-of-magnetic-effect-on-compass,

and video   http://vimeo.com/29519728.

Permalink Reply by Marc on March 16, 2012 at 11:06am

Wow that is a impressive test im amazed with all the wires to the motors and the lipo's the mag works at all....................

Permalink Reply by Marc on March 16, 2012 at 6:06am

Good point gord will remove lipos when i get home tonight and let you know what happens.

 

regards

 

Permalink Reply by Marc on March 16, 2012 at 11:24am

hello gord,

just to let you know i removed the lipo's and it made no change to the mag its still 45 degrees off :(

 

Permalink Reply by Gord Likar on March 16, 2012 at 11:28pm

Looks like it going to be a stubborn problem.

Permalink Reply by Marc on March 17, 2012 at 6:32am

thanks monroe, i will do some homework as well.

 

regards

Permalink Reply by Marc on March 20, 2012 at 2:50am

hello monroe,

well i have spent days now trying to solve this have now had to turn magnetometer off, so i now have a board which flies the hex exactly like my 20 pound kk board :(

also had to go back to mission planner 1.1.50 as if i update any higher my apm will not connect to laptop

anyway hope people are having more luck than me

regards

Permalink Reply by emile on March 20, 2012 at 3:02am

Marc, did you have the chance to upload recent firmware from the planner?

If no, please give it a try then:

Reset all of you parameters.

Calibrate radio and configure as usual.

Calibrate your mag without turning on the motors away from any metal or source of magnetic interference (you can now set the offsets in the left side of the configurator...) 

Fly in stabilize mode for a while with mag enabled (and declination configured)... like a few batteries.

In ths time try to face the copter in a 360° pattern.

This has to be done in a magnetic interference free environment.

The best would be to fly at least for 8/10 minutes to allow automatic compass calibration to converge correctly.

Then test away from any big computer, heater (yes my fixed home heater is connected to house ground and is a huge magnetic interference!) and let us know.

What you have done is  account for the magnetic interference of the motors during flight, something you cannot do in static calibration.

You must reset all of your parameters before this, otherwise you will keep your old values in and probably all this will not work.

Hope this helps,

Emile

Permalink Reply by Marc on March 20, 2012 at 3:11am

hello emile,

have tried all of the above with no success the mag is about 60 degress out now and i am not powering any of the motors and have tried this in about 20 different locations

 

regards

 

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