Verify magnetometer / heading hold is working correctly

[GoogleCodeExporter]

Appears that heading changes by about +/- 5 degrees when quad is tilted.  Just 
need to verify if til compensation is working correctly and that it is 
represented accurately in the artificial horizon of Configurator.

Original issue reported on code.google.com by CaranchoEngineering@gmail.com on 10 Aug 2010 at 6:05

[GoogleCodeExporter]

During conference call, found out that mag should be mounted upside down with 
pins facing forward.  Artificial Horizon still hows drifty output, and also 
seen duing Stable Mode flight.

Original comment by CaranchoEngineering@gmail.com on 22 Aug 2010 at 7:58

• Changed state: Started

[GoogleCodeExporter]

Mag should be mounted with components up and pins pointing backwards by 
default.  

From what I can tell the heading hold works in stable mode.

I sometimes see drift but I think it may be coming from the radio's rudder not 
being perfectly centered or perhaps there is an issue with the tilt 
compensation in the APM_Compass library (not sure).

Original comment by rmackay...@gmail.com on 3 Oct 2010 at 1:23

[GoogleCodeExporter]

Heading hold works especially if you make use of the new SetOrientation and 
SetOffsets.  Wiki's been updated with this: 
http://code.google.com/p/arducopter/wiki/Quad_Magnetos

Original comment by rmackay...@gmail.com on 24 Oct 2010 at 1:23

• Changed state: Fixed