Need help in PID tuning

The last Bastion to fine tune your FC matching your airframe & setup

Need help in PID tuning

Postby auhouhz » Sun Jun 30, 2013 5:51 pm

I have a 3kg hexa.

Tarot FY680
SunnySky 700kv motors
SimonK 30A ESCs
12X4.5 props
DX8 + Sat

Please see this video on PC for annotations:

30 june pid.JPG
30 june pid.JPG (80.94 KiB) Viewed 1274 times

30 june radio.JPG
30 june radio.JPG (84.52 KiB) Viewed 1274 times

mot throttle.JPG
mot throttle.JPG (92.47 KiB) Viewed 1274 times

Mot roll.JPG
Mot roll.JPG (90.44 KiB) Viewed 1274 times

In normal mode, it flies ok but have small and fast oscillation on the roll axis. on one occasion, one motor seems to have stopped for 1 sec. In position mode, it have the same small and fast oscillation on the roll axis and it cannot hold altitude. It will slowly drop until it touch the ground.

Please guide me on how to resolve the oscillation and alti hold.

Thank you.
Posts: 9
Joined: Sun Apr 21, 2013 12:15 pm

Re: Need help in PID tuning

Postby joebar.rc » Sun Jun 30, 2013 7:06 pm

Tuning takes time but some starters:

Fast oscillations: to high tilt rate D, try it with lowering it in steps of 100, maybe around 4000
Still oscillations? or when you roll, let go the stick it 'bounces' around the roll: lower the angle P (maybe to 35?)
Slugish respons, lower the angle D.

First resolve these before going to the next phase, and a lot is already written on the site and in the forum
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