MultiWii

Hi people, im here because im losting hope to configure my quadcopter. Tried different settings but none went good.
First i tried to fly with the default settings, but the quad was wobbling a lot.
Then, i have read some tutorials and tried to set all the values on PID to 0 on ROLL and PITCH and increase the P until the quad wobbles.
But even with P = 0, it still wobbles!
Then, i increased P on ROLL and PITCH to 1.0, and saw no difference.
After this, i tried to mess with the I and D a little, until i set the I to 0.049 and D to 23. Doing this it flies much better, with a lot less wobbling, but still wobbles.
What im asking is, why changind the I and D made it fly better? what is the logic? What do i do now, to make it fly stable?

Some of you may say that this problem is the center of gravity, but i dont think so, because if i fly it in acro mode, it flies very stable, i can hover very easily.

one of the greatest videos made for this very question, good luck!

Yes this is the video i watched to learn to set up.
The video tells if there is wobbling in a high frequency, i should decrease P, but as i said, the wobbling stays even with P=0, and don't go out.
I think it may be related to the other sensors, like LEVEL, ALT, Pos...
But i couldn't find documentations about these...

begins to sound like you have a vibration problem. use good paddingo n your FC, check for vibrations using the gui (in bluetooth if you can so you can watch vibrations while flying), you can also try using a LPF

about this LPF...
This is not done in the multiwii GUI, it's done in the arduino code, right?
If i change the code, applying the Low Pass Filter, i need to set up the PID on the multiwii gui again after? Or, if doing changes on the gui, i'm gonna loose the LPF setted before through arduino?

no, your pid info stays in eeprom, you will be ok changing lpf and nto affecting your pid settings

tovrin wrote:

one of the greatest videos made for this very question, good luck!

Good video. Though I think only good if you're flying in + configuration.
You'd need some kind of rig to do that if in X mode.

Tempted to build something becuse this is a great way to really study the behaviour and eleminate all the random environmental factors. I think I'd also be able to watch the vibrations too.

as far as PID cause and affect the wobbles and flying characteristics should be much the same between + and X, right? Ive never flown a +

tovrin wrote:as far as PID cause and affect the wobbles and flying characteristics should be much the same between + and X, right? Ive never flown a +

That's true, but he has the string tied to opposite arms and it's rotating about that axis. An X config quad would rotate about an axis 45' to that for pitch and roll.

ahh, yes, i was mainly referring to the actual flying part in the beginning. i would love to have a nice string setup for a X, cant really be too hard to design...

tovrin wrote:ahh, yes, i was mainly referring to the actual flying part in the beginning. i would love to have a nice string setup for a X, cant really be too hard to design...

It might work if you tie a piece to each pair of opposing arms. Gonna try some experiments when my busy life allows some play time. Will post pics.