Hi there ,
I've attached the compass to the quad as the image below show (APM points forwards - between yellow arms). and the compass is Rotation_Roll_180.
When I'm calibrating the compass I keep getting reversed results (North shows South).
I've tried rotation none , yaw 180 , rotation_pitch_180 without luck.
1. Does this affect loiter mode ? Alt hold works fine , loiter and RTL don't work well , quad drift and fly somewhere it shouldnt.
2. What can I do in order to get good results from compass ?
Attached image how I mount my Ublox.
Replies
u can do calibration inside but to test feature related to GPS u need to place the quad outside....
How I check sensors calibrated ?
I did compass calibration , radio calibration.
Just tested , I think loiter was ok - It lost some ALT and made small crush on ground.
LTR didn't work.. quad ascended and flew away from "home". I cut the throttle and it crushed... now I'm looking for some spare parts (my GPS cable is torn.. no idea where to get replacement)
https://www.youtube.com/watch?v=uwJ0410yPm4
Sorry about that Eran. Steep learning curve here. You will get the hang of it. I recommend that you get comfortable flying in stabilize before testing any GPS functions. Stabilize is really your manual failsafe. anytime my quad misbehaves when flying with GPS (loiter, RTL, auto), I can quickly switch it back to stabilize and bring it home, assuming i still have line of sight.
from APM mission planner teminal tab u can check the sensors by typing simple commands.....connect and type help u can see several options... to stabilize the quad first try position hold because it is a semi autonomus mode... u can control the throttle at that moment... after successful position hold may try loiter.. If you compass and GPS is working proprly then RTL should work...
The compass right now is facing that the YELLOW legs is the direction of your quad, so try Yaw 90 Yaw 145 , Yaw 180 etc.
Only use the YAW ones not roll or pitch.
After each YAW do I need to do calibration again ?
the roations_roll_180 is (semi) specific to the 3DR GPS/compass module.
it appears that your compass chip is on top of your GPS/compass board - in which case, you would not want roll_180. Usually the z-axis is directed out the top of the chip.
The other possibility is electro-magnetic noise affecting your compass readings. you may need to elevate your compass further away from your power distribution.
My power distribution is below the APM (I use QBrain) I don't believe it affect the Compass (see image).
How do I know what is the correct orientation of the compass to mount ?
20140417_101529.jpg
On my copter, my GPS/compass is 6/7 cm above my power distribution and is shielded by a ground plane directly underneath the GPS/compass.
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