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PiD i guess
« on: September 03, 2017, 04:42:36 am »
Hello everyone. I have a 250 quad everything was ok until i add a go pro, after that i have alot oscilations when i throttle up i have no idea how to fix it. Any idea? Thank you
« Last Edit: September 03, 2017, 12:48:15 pm by Nefer »

Re: PiD i guess
« Reply #1 on: September 03, 2017, 06:02:45 am »
By adding extra weight, you have reduced the performance.  There are many ways to increase or decrease performance.

Any time you reduce the performance, you need to reduce the PIDs.  It will act a little more sluggishly, but that is the price you pay.

First save your current settings so you can get back to them if you want: File -> ExportUAV...

For an easy fix, I would go into Stabilization -> Expert Advanced -> Bank# and reduce all 9 inner loop PIDs by multiplying them by say 0.75 each.  If it still oscillates do it again (so you reduced them twice).  Or start back over with your saved settings each time and try a different reduction factor.  Numbers between 0.5 and 0.9 would be good test points.

If you plan to fly sometimes with / without the extra camera, put one set of PIDs in one bank and the other set in a different bank and use your FMS to select which bank to use depending on whether you are carrying the camera.  Or just always fly with the smaller PIDs.  It will not oscillate in either case, but it will react a bit slower without the camera than it used to.
« Last Edit: September 03, 2017, 05:36:31 pm by TheOtherCliff »


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Re: PiD i guess
« Reply #2 on: September 03, 2017, 03:59:36 pm »
Thank you for your reply.
But i cant find wich values i have to change in that tab, I uploaded image. Can you tell me what i have to change?
Thank you

Re: PiD i guess
« Reply #3 on: September 03, 2017, 05:35:46 pm »
Oops sorry.  I meant Advanced, not Expert.

Stabilization -> Advanced -> Bank#


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Re: PiD i guess
« Reply #4 on: September 03, 2017, 07:08:30 pm »
Thanks again.
 Look at the image and confirm if these values ​​are what I have to change please.

From what I understand, I have to multiply all by 0.75. They looked like this:

     ROLL                   PITCH              Yaw
P:  0.00225             0.00225           0.00465
I:  0.004875            0.004875         0.0075
D: 0.00002475        0.00002475      0.0000375

Please confirm if im doing it correctly.
I can multiply the values between 0.5 and 0.9 for future pid tunning right?
Thank you very much

Best regards

Re: PiD i guess
« Reply #5 on: September 04, 2017, 03:23:19 am »
That is them.

Starting from PIDs too high you want to reduce and so you multiply by say 0.5 (cut it in half) to 0.9 (reduce just a little)

If PIDs were too low you might increase them all by multiplying by 1.1 (increase just a little) to 2.0 (double them).