APM2.5 - ArduCopter 2.7-- compass two different headings depending which direction I turned

[GoogleCodeExporter]

Arducopter traditional Heli (T-Rex 450)
Hardware:APM2.5 
Software:ArduCopter 2.7 - Mission planner 1.2.1

Settings: No autodeclination,  manual declination of 21    

Heli is placed on the table pointing SW.
If I turn the heli by hand to the right to NW and back to SW, the compass stops 
at SW and then ticks slowly past SW to almost S and then stops. If I do the 
same procedure the other way round,  SW to SE and back to SW, the compass stops 
at SW and then starts drifting slowly past SW to W and then stops. There are 
two different headings at the end, depending which direction I turned.
At the Mission Planer on the Quick Tab you can see the Yaw indicator ticking 
0.1 deg. at the time drifting away. The Heli stands still, no motor is running.

I expect the compass to stop and indicate heading SW and not slowly drifting 
away past SW to S or W, depending which direction  I turned before.

Original issue reported on code.google.com by colman...@gmail.com on 31 Jul 2012 at 10:36

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

An additional observation on the issue:
Placing the switched of  heli on the table heading SW. After switching on and 
AMP initialising the compass heading shows 150 and then it starts drifting 
about 1deg/sec towards 225(SW)  and stops after about 2 min  at heading 229.

Original comment by colman...@gmail.com on 1 Aug 2012 at 12:37

[GoogleCodeExporter]

you do setup - erase and setup - reset from the console?
Did you restart controller after enable compass?
Did you perform the calibration procedure the compass and receive 3 ofsets? 
check by touristic mechanical compass direction of magnetic fields on the 
desktop?

Original comment by alexeyko...@gmail.com on 17 Aug 2012 at 5:46

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

I went through your recommendations, still the same.

After that, I checked the compass in the “Mission Planer Terminal test 
Compass” everything is fine there, point the heli to N it shows 0,1,0.... no 
drift, point it to W it shows 270,271 270... no drift   aso. 

Still connected to the USB and pointing N, I went to the Flight Data tab, 
connected, after link was established, compass shows 150 and then drifting 
slowly to N and beyond.

Everything else I reported above in this case, still applies.

I guess some buck in the Mission Planer, because raw data ok (test compass)???

Original comment by colman...@gmail.com on 19 Aug 2012 at 5:47

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

same issue sometimes wrong sometimes turns clockwise slowly

Original comment by st3fano....@gmail.com on 19 Sep 2012 at 10:14

[GoogleCodeExporter]

Closing all issues on the old issues list by marking them WontFix.

If this is still a valid issue please re-raise it on the new GitHub issues 
list: https://github.com/diydrones/ardupilot/issues

Thanks!

Original comment by rmackay...@gmail.com on 21 Jul 2013 at 2:14

• Changed state: WontFix