KK2 with Open Aero 2 - Help tuning?

[OrangutangSurfer]

So I built a super awesome Blunt nose versa, took my time and put all the electronics before sealing it up, so no holes, barn doors, etc. I couldn't be happier with the build but that's for another thread... I installed a KK2.1.5 with Openaero2 Firmware. On the test bench the it would appear to function fine in stabilization and auto level modes however when I took it out for it's maiden today neither function was flyable.

at low speed it seemed to function ok but as I made my circle back in to the wind and my air speed kicked up the wing made a vigorous shake as if I was banging up and down on the elevator channel. as soon as the stabilization was switched off it quit.

I know there are some "gains" or what not PID tuning for elevator/aileron/rudder. But I can't find any guidance, even the openaero wiki states PID tuning was out of the scope of the guide...

my best guess is that either the gyro is too sensitive and excessively correcting or the corrections are too extreme, overcorrecting causing it to correct the opposite direction. or maybe a combo of both, i'm not totally sure how it works but i need to "turn it down" and then dial up from a low safe setting...


any idea how to do that?

-Jes

 

[Zap brannigan]

I built a "dead Cat" quad and they sent me a KK2.1.5 instead of the multi wii that was shown in the build.
the quad wont fly,it just flips over and breaks 10 dollars worth of props,and no tech support!

 

[xuzme720]

I built a "dead Cat" quad and they sent me a KK2.1.5 instead of the multi wii that was shown in the build.
the quad wont fly,it just flips over and breaks 10 dollars worth of props,and no tech support!

Who sent you the board?

 

[Tritium]

Way to hijack a thread guys! The OP ask about OpenAero!

Jes, I just loaded it on a KK2.1 yesterday but it is not installed in a craft or flown yet. HappySundays that wrote the firmware is a member here though so possibly he will see the question!

Thurmond

 

[Merv]

You may not care any more, but I've successfully flown a Versa with a KK2.1.5 using OpenAero. Mine few with the default PID's in stabilize mode. When I switched to stabilize plus auto level, I got the vigorous shakes you described. I turned the PID's down until the shakes stopped. At the moment my versa flies OK, but the auto level does not have the authority I hoped for.

When it comes to flight controllers, I'm a newbie so take my advise accordingly. First reduce the I & D to zero, and cut the P in half. If your plane still shakes, cut the P in half again. When the shaking stops, try upping the P by 10. Continue to up the P until the shaking start, then back it off a bit. Your looking for a P value just below where the shakes start. The P value for pitch will likely be different than the P for roll.

So this is where my knowledge ends. The next step is to start upping the I & D values. Some say tune the I value first some say the D value first. Also, I do not understand the interaction between the accelerometers and gyros.

My next step will be, tune my gyros first then tune accelerometers.