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AutoQuad Forum • View topic - Tuning soft frame
Page 5 of 6

Re: Tuning soft frame

PostPosted: Wed Feb 24, 2016 8:19 pm
by LPR
Pat

If you attach a complete parameter file I can send a complete one so all you'll need to do is load the file.

The kind of control you are getting is uncommon so I should have a look at the complete file.

Larry

Re: Tuning soft frame

PostPosted: Wed Feb 24, 2016 8:22 pm
by Patnet
Thanks Larry, attached.

revised_params_112515.txt
(14.83 KiB) Downloaded 273 times

Re: Tuning soft frame

PostPosted: Wed Feb 24, 2016 9:35 pm
by Max

Re: Tuning soft frame

PostPosted: Wed Feb 24, 2016 9:43 pm
by Max

Re: Tuning soft frame

PostPosted: Thu Feb 25, 2016 12:25 am
by Patnet

Re: Tuning soft frame

PostPosted: Thu Feb 25, 2016 1:06 am
by Max
I dunno, can't tell which way is forward in the closeup... :) -135 would be yellow LED forward, and flip = 1 would be GPS chip up. So if forward in your picture is to the right, then yes, I think that looks correct. Can't tell you how many times I've messed up the rotation/flip/motor order, so I always recheck that whenever something doesn't seem right.

-Max

Re: Tuning soft frame

PostPosted: Thu Feb 25, 2016 1:28 am
by Patnet

Re: Tuning soft frame

PostPosted: Thu Feb 25, 2016 10:08 pm
by Patnet

Re: Tuning soft frame

PostPosted: Thu Feb 25, 2016 10:37 pm
by Max
Hi Pat,

So, what has happened since this post: viewtopic.php?f=40&t=4687&start=20#p35251 ? You had no motor clipping there (though their range is still pretty wide).

I'm not sure, but from what you posted it looks like "classic" vibration issue where the PID controller is basically amplifying the gyro output. I would try to tune the attitude PIDs to where you get the best control response but with as narrow motor output range as possible, as far from clipping as you can get. Until then, it'll be a "nervous" flyer at best. Reducing Tilt Angle D is the quickest approach, but it will reduce control authority and as you've found, if you reduce it too much you'll loose all control entirely. After you find a happy medium there, the other rates (esp. Tilt Angle D) can sometimes be increased to give you back some control response.

I could also build you a special firmware which reduces the sampling rate of the Gyro sensor... a few people have had good luck with it on difficult frames (including myself). Theoretically the same result can be achieved by tuning the attitude PIDs, and I'd recommend that approach vs. a custom firmware. Putting the PIDs on Tx knobs (with my beta firmware) would be the first thing I'd try since it makes PID tuning almost fun :)

HTH,
-Max

Re: Tuning soft frame

PostPosted: Thu Feb 25, 2016 10:52 pm
by Patnet