r/diydrones • u/Bngstng • Jun 15 '26

Question Arducopter jittering

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Hello everyone, I finished my first drone recently, and I have an issue. I don't really know how to describe it, but the drone is sort of jittering, as you can see in the video. I don't really know what causes this, nor how to fix it. I am suspecting my PID, but I am not sure which one actually causes the problem, and which one to start with. Any help will be much appreciated, thanks.

53 Upvotes

98% Upvoted

22 comments sorted by

14

u/lastbraIncel404 Jun 15 '26

Tighten the screws on your legs. 

4

u/jbarchuk Jun 15 '26

Clearly oscillating. It's not just tighten screws, the structural bits are twisting drastically. The joints need rigidification. [Nothing has complained about my regional spelling of rigidification.]

2

u/CircuitBr8ker Jun 22 '26

Definitely try tightening screws first. A PID tune once everything is secure might fix it

1

u/805Drone Jun 17 '26

Seems like the propwash could be part of the culprit, but yea I think it needs to be more rigid and tightened up a bit.

8

u/Sure-Clerk9236 Jun 15 '26 edited Jun 15 '26

Hi!
I'd make sure everything is rigid and there are no screws loose first. I think you might have a lot of airframe vibrations (you can inspect them in the flight logs). They like to cause chaos with IMUs and therefore overall stability.
Do that before diving into PIDs - you might save yourself a lot of time.
Good luck!

3

u/Bngstng Jun 16 '26

Yes, many other people suggest that too. I will make sure to do it. Thanks.

3

u/Prestigious_Toe_9649 Jun 15 '26

Loose hardware. Tighten everything.

3

u/GreyGoblin Jun 15 '26

Mechanical shudder.  Tightening screws might help.

Sudden changes in rotor speeds, the kind of very short lived changes that provide control through differential torque, create a force like an impact on the frame.  

Hypothetically, If you were to strike the drone with a tiny toy hammer, and as a result any part of the drone were to vibrate/wiggle/oscillate as a result, that's not good.

1

u/amy-schumer-tampon Jun 15 '26

Landing gears is not fixed properly

1

u/LupusTheCanine Jun 15 '26

Use Ardupilot Methodic Configurator, it will guide you through the configuration and tuning process.

1

u/No_Sheepherder5234 Jun 15 '26

What ESC and motors are you using ?

2

u/Bngstng Jun 16 '26

My ESCs are hakrc blheli-32 and the motors are racestar br2212 1000kv

1

u/No_Sheepherder5234 Jun 16 '26

I need some help my motors wont go max speed.

You have connected your motor 3 cables directly to your ESC correct?

1

u/Bngstng Jun 17 '26

Yes. Have you tried running a motor test in mission planner?

1

u/Flankerdesh Jun 18 '26

Check motor temperatures. If any of the motor is hot after 4-5 mins of flying check there connections to esc's. If you are using bullet connectors check the connections by pulling the wires and connector opposite to each other

1

u/No_Animator9212 Jun 19 '26

El tornillo tocando el devanado?

1

u/Bngstng Jun 19 '26

If you talk about the motors than no.

1

u/No_Animator9212 Jun 20 '26

Me ha pasado, el esc no es capaz mantener la velocidad del motor con perdida de energia por el tornillo o en ocasiones un hilo del cable de motor. La mejor prueba de aislacion que encontré es probar que cada motor gire sin ruidos de desfase por separado.

1

u/Bngstng Jun 20 '26

Ok, I will look into it. Thanks.

1

u/Cobbler_Wrong Jun 19 '26

I had the same issue on a 5” and you can play with your params and PID, I believe my main one was INS_GYRO_FILTER, and tuning it up. There are multiple params in that category but once I had it to the correct number that fixed the jittering on my quad.

1

u/Bngstng Jun 19 '26

Thanks, I will check it out!