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Re: [Paparazzi-devel] AR.Drone 2 magnetometer issues?

From: Ben Laurie
Subject: Re: [Paparazzi-devel] AR.Drone 2 magnetometer issues?
Date: Fri, 30 Jan 2015 21:33:07 +0000

On 30 January 2015 at 21:29, Ori Pessach <address@hidden> wrote:
> So, any ideas from anybody? I'm considering getting a new nav board, but
> they're not terribly cheap so I thought I'd try to figure out whether the
> one I have is broken, or whether they're all like that.

Can't help you much, but I can say I did not see any of these problems
with my ARDrone2 ... haven't flown it for a while now, though.

> Thanks,
> Ori
> On Sun, Jan 25, 2015 at 7:14 PM, Ori Pessach <address@hidden> wrote:
>> Hi,
>> I was wondering if someone who had some experience flying the AR.Drone 2
>> could tell me whether what I'm seeing is typical, or a sign of a possible
>> hardware issue.
>> The magnetometer readings seem to be very erratic. I've seen a range of
>> behaviors:
>> * Tracking the drone's direction perfectly.
>> * Showing a direction that's rotated 180 degrees
>> * Showing a direction that's rotated 90 degrees counterclockwise (???)
>> * Being JUST a little bit off, and then appearing to be perfectly fine
>> after I took the drone and walked around in circles while holding it.
>> So, what's going on? I've been seeing some serious navigation issues, and
>> I'm wondering if the magnetometer can get out of calibration midflight,
>> which might explain the erratic behavior I've been seeing: Taking off
>> perfectly, holding position fine, and then navigating to the first waypoint
>> and staying there without issues. Things after that can be pretty erratic,
>> however, including going way off course on the way to the next waypoint,
>> wobbling wildly back and forth, and sometimes trying to fly into the ground
>> at high speed at a 45 degree angle. Which fails, because of immutable
>> physical properties the ground happens to possess.
>> I've calibrated the magnetometer, changed the values for the local
>> magnetic field, and the fact that SOME things work, at least at first, would
>> indicate that the drone should be able to fly fine - at least as far as I
>> understand it.
>> So... What now?
>> Ori
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