Continuous Yaw upon lift-off. PX4 Pixhawk 6X

Hi,

I am experiencing continuous yaw throughout my whole flight. Below is my setup and the flight logs.

Setup:

  • Generic Quadcopter with PX4 and QGC.
  • Tarot frame.
  • Pixhawk 6X from Holybro
  • M8N GPS module
  • 6S Lipo
  • T-motor 40Amp ESC
  • T-motor MN5008 motors
  • T-motor 15 inch CF props
  • Take-off weight 2.8kg

Flight logs:
https://review.px4.io/plot_app?log=15d4e222-f807-4e13-97b4-7e62d877ba86
https://review.px4.io/plot_app?log=04659704-76ae-4551-ba34-2bb544946aeb
https://review.px4.io/plot_app?log=6eb07afb-fcbf-4c09-bb87-b8c2e346eb08

1 Like

More flight logs after performing calibration again. For all of the flight I just take-off and land after a few seconds as the drone either drifts a lot and spins in the yaw axis.

Arm on ground without lift-off:
https://review.px4.io/plot_app?log=8f87ddc6-46a2-4eee-808d-4488126eb140

Position mode:
https://review.px4.io/plot_app?log=41864304-212b-4f3f-b441-109e0281ef3d
https://review.px4.io/plot_app?log=14cc7d33-588a-4996-bc10-24f2305d2081

Stabilize mode:
https://review.px4.io/plot_app?log=99c41bdb-b3a9-4d00-ab53-d0d41cc229a0

Completely off topic, but you are in Chicago. So are we.

Have you gone through the normal pid tuning procedures?

It looks like your step responses are rather off.

Hi @Andrew_Wilkins ,

I have not done any PID tuning. I am fairly new to PX4 and QGC, but have built drones before with Ardupilot and Mission planner.

Can you please point me in the right direction for PID tuning or a complete guide to PX4 setup and steps before flight? I did use the px4 online docs, but might have missed it.

Only place I see tuning is in-flight autotune.

Yes we are indeed. I am a Masters in Robotics student at Northwestern University. Very briefly met you when you gave a talk there at the end of last year.

Best,
Marno

Ah, yes Zach gave the talk there.

I would say start here, but if you would like we can hop on a call and talk through more of the process. I see from the logs that that might be the main cause for this

Thank you @AWilkins_Ascend I appreciate the time. I will give feedback once I have tried the PID tuning.

Hi,

Not sure if you resolved this. We are using px4 and we have it tuned. However, when we do a stick input to yaw, it keeps yawing until we do a stick input to stop yawing. Is there a setting/param in PX4 to stop yawing when you let off the stick?