On start up even after calibration PX4 rolls up to 13 degrees and pitches 7 on desk.

[ghost]

Even after calibrating the PX4 and leveling it in the CLI the HUD in Mission planner Flight Data (and status) shows rolling up to + and - 13 degrees and pitching up to + and - 7 degrees using USB with Copter sitting solidly on desk.

The HUD looks like it is flying around on its own.

After going to view raw accels and gyros (which were solid bars at 0 and - 9.8) and arming and turning motors on and off it stopped moving around on its own and appeared stable.

This behavior occurs repeatedly.

[rmackay9]

this sounds like the "why is the HUD moving even when it's on my desk" question. It's because of the AHRS_GPS_GAIN and the centrefugal force compensation using the gps. It only happens when you have a bad GPS signal and when you're not armed.

I'vemade a video explaining this further and it's listed in the trouble shooting guide here. http://code.google.com/p/arducopter/wiki/AC2_Troubleshooting#The_mission_planner%27s_HUD_display_moves_around_even_though

[ghost]

Hi Randy, Certainly looks like the problem. I will close the issue. I will also verify behavior as you indicated for the PX4. And I will update the ArduCopter new wiki to include a reference to this phenomenon directly in the appropriate locations. Thank You, Gary

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From: Randy Mackay notifications@github.com To: diydrones/ardupilot ardupilot@noreply.github.com Cc: grmccray grmccray@yahoo.com Sent: Wednesday, April 24, 2013 9:41 PM Subject: Re: [ardupilot] On start up even after calibration PX4 rolls up to 13 degrees and pitches 7 on desk. (#222)

this sounds like the "why is the HUD moving even when it's on my desk" question. It's because of the AHRS_GPS_GAIN and the centrefugal force compensation using the gps. It only happens when you have a bad GPS signal and when you're not armed. — Reply to this email directly or view it on GitHub.