Hello Everybody

I am building my first Drone and today i ran into a bigger problem.
As soon as i arm the Drone all four Motors a freaking out and oscillate like crazy (near to full throttle)
Everything should be configured correctly as far as i know (watched a ton of youtube videos)
What i already checked:
- FC orientation
- Motor direction and alignment
- Betaflight Firmware 4.3.2
- ESC Firmware BlueJay 0,18 (same result as before with stock BlHeli_S Firmware)
- activating bidirectional DSHOT
- turning AirMode on and off
- changing Motor Protocol (DSHOT600 / 300 / 150)
- checking Radio Mixer
- Props off and on - no difference

If i turn the Motors on via Betaflight, everything works normal. Motors spin up as they should
I really dont know what else to do. Maybe someone had a similar problem before



Drone components:


FC: SpeedyBee F405 V3
ESC: SpeedyBee BLS 50A 4 in 1 ESC
Motors: Axisflying DIAVOLA 2207 1906kv
RX: Crossfire Nano Pro
Caddx Vista Nebula Pro

Check to see if your motors are reading rpm correctly on the motor tab. You could try turning off bi-directional dshot as well to see if it makes a difference.

Mechanically check ALL screws and make sure your stack isn't loose or too firmly mounted. Stack should feel snug but not too tight and not too loose in the gummies.

Last case would be to add more filtering and turn down the pids a couple clicks as it sounds like it could be a noisy build if you find no mechanical issues.

Triple check that propellers are on the right way, according to how motors are mapped (props in or out). I've managed to put mine on wrong several times.

Thanks for the replay.

I checked what you said. The Stack sits fine now.
Motor RPM is showing correctly.
So i turned down the PIDs to 0 to test it. And it worked.
I could arm it normally and throttle works as it should.

So am i correct that the build is indeed very noisy ? Can i counter act that with filtering ?
I don't have any experience with such a behavior

I would also try another version of betaflight (newer).. also did u save the original firmware it came with? What bf version was it? I have heard some firmware updates can have “issues”… or something wasn’t set quite right for that particular target..

it is Betaflight Version 4.3.2

Did u load 4.3.2? Or did it come with it ? I have heard if u have encouraged weird issues after loading a new version of betaflight to try and re install the original firmware..

(05-Jan-2023, 05:22 PM)Philipp.T Wrote: Thanks for the replay.

I checked what you said. The Stack sits fine now.
Motor RPM is showing correctly.
So i turned down the PIDs to 0 to test it. And it worked.
I could arm it normally and throttle works as it should.

So am i correct that the build is indeed very noisy ? Can i counter act that with filtering ?
I don't have any experience with such a behavior

Well you don't have to turn pids to 0 lol. Use the pid sliders and go down by about 10 percent.

For filters, also use the slider and increase the filtering by moving sliders to the left. Go 2 notches to the left and see if it handles ok then.

(05-Jan-2023, 06:48 PM)Lukeman Wrote: Well you don't have to turn pids to 0 lol. Use the pid sliders and go down by about 10 percent.

For filters, also use the slider and increase the filtering by moving sliders to the left. Go 2 notches to the left and see if it handles ok theIi

I have to turn the PIDs all the way to the left (0,5) and the Filter to 0,75. Only then the Motors don't freak out immediatley
(Photo attached)

Photo of PID

   

Ok. Yeah I would think you have a deeper issue then. Seems like your gyro is getting excessive noise when your motors spin up.

The best way to see the noise is to log some black box data. You need to set the black box to log gyro scaled. Once that's set, you can empty the black box storage and then go fly it for 30 seconds. Pull your black box log off your drone and post the file here and I'll analyze it for you.

Oh! one more thing to check. Can you check your motor screws to make sure they aren't touching the motor windings. I've done this in the past and it causes very strange behaviors.

(05-Jan-2023, 08:59 PM)Lukeman Wrote: Ok. Yeah I would think you have a deeper issue then. Seems like your gyro is getting excessive noise when your motors spin up.

The best way to see the noise is to log some black box data. You need to set the black box to log gyro scaled. Once that's set, you can empty the black box storage and then go fly it for 30 seconds. Pull your black box log off your drone and post the file here and I'll analyze it for you.

i can do that tomorrow. its kinda night time right now

That fc has black box… it’s not that hard, I used it once to trouble shoot a bad motor .. actually the motor screws were to long and damaged the windings ..
Give it a shot.. you just may learn something

So it is raining all day but i managed one flight in little less rain.
I dont know whether this data is sufficient for an analysis
It actually didnt fly bad but a bit too short to be more precise.



  LOG00004.zip (Size: 1.36 MB / Downloads: 50)