Tricopter V 3.4 Yaw block when arming

ArduCopter Copter 3.4
1

Hi Pilots!

I have just built my first tricopter on PixHawk. Everything works fine exept the yaw.

When I arm the yaw is running full throttle one way and cannot be moved by rc.

Anyone know what that could be or how to find out?

2

Can you share a log please? Thank you.

3

I have downloaded the logfiles, but don’t know which to send. They are too big to send all.

4

We want a .bin file. If you can’t figure out what the file is, you might upload a zip somewhere (Onedrive, Dropbox, etc.) and share a link.

5

flightdata.zip (865.4 KB)
Thank you, here you have 3 .bin files

6

I am using a KST S115MG mini digital servo, connected to channel 7.

7

The Pixhawk has an SBEC 5V Power Supply on Aux 2. The Wires of the KST are connected Black to Ground, Red to 5V and Orange to Signal.

8

Hi TriDelrin,

I can see in the log that you are getting output to channel 7. Do you have another servo you can plug in or a servo tester you can use to look at the output?

9

Hi Leonardhall, thank you I have changed the servo to the exact same one and it is working.
Unfortunately the yaw has a little jitter noise all the time which does not sound healthy.

The flying ability seems not to be disturbed by that because the yaw is working fine, but I guess like this it will burn out soon…

Is there a way to change the off Frequency. I have already worked with some ferrite rings and clips, which helped a little but it is still doing zzzzzzz kk zzzzzz kk zzzz :frowning:

10

@TriDelrin Please share a new log, it is harder for Leonard to help without them.

11

Hi TriDelrin,

Digital servos will tend to buzz but you should also drop the INS_GYRO_FILTER to 5 to 10 Hz I think.

12

Leonardt, thanks for your work for tricopter, yaw feel very good and rovk solid on a few tries I’ve buolt and run on ac3.4rc1. May I ask what is a time frame for RC2? I know there is a bug in alt conversion from cm to m in rc1, I do experience it regularly, I though that it was something related to GPS alt as copter would momentary jump half a meter as number of sats changed. I have frsky telemetry out and its very easy to notice. Since I’m using pixracer on one of the copters I am pretty much mandated to use AC3.4 just as all the quad/hexa guys with pixracers, we would surely appreciate rc2 with a fix, which is already in the PR. Thanks MUCH!