JJRC H20 Hex Quad

Ok I can confirm this small yaw drift to the right and time to time a noise in the yaw command. Sound like you said a roundoff problem

goebish wrote: test builds:

Devo 7e
Devo 10

Please report.

Still the small yaw drift ...

geobish, thanks for the hard work. I've just tested your 7e test built. Unfortunately, the problem still persisted. The hex wouldn't stop spinning and trimming didn't help.

goebish wrote: Thanks for reporting.
Can you try to set rudder channel to a fixed value of 0 and check if the problem remains ? (obviously you won't be able to control yaw )

Tested with rudder channel fixed to 0, no more yawing left & right. It finally able to hold its headings.

Then, I made another test with Expo 100 and it also worked, no more yaw drifting. Changed the Expo back to 45, yaw drifting again.

goebish wrote: Please check this one:

Devo 7e
Devo 10

Tested the 7e bulld. It worked perfectly. The hex can now hold its headings and flies very stable. Thank you very much for your excellent work!

goebish wrote:

SeByDocKy wrote: Other good news, the actuall protocol binds the JJRC H11D & H20C. But actually, we need to add a lot of functions
- video
- photo
- Headless
- Onekey return
- Reset (gyros calibration)
- camera tilting

I need to capture the associated SPI data

Do you have the data ? or maybe they're already in another thread... too much protocols

For this one I can't remember, but I recently captured data for the JJRC H20W (different from the H20C), for the JJRC H29G and the Fayee 805

Very nice, but one of the motors doesn't rush

goebish wrote: Please check this one:

Devo 7e
Devo 10

Spare motor finally arrived... I can confirm this build fixes the heading-/yaw-problem (awesome!), but please note that some Expo for rudder is needed. Not a problem for me, but when I started testing with a simple 1-to-1 curve, the problem came (randomly) back after using rudder. It sometimes stopped when using the rudder again. Now I'm using some Expo and the problem is gone With Expo 25 it was still a bit glitchy, but Expo 35 seems to be already enough for a stable flight. Thanks a lot for having another great flyer. Also, thanks to petsmith for doing the tests!

and I thought that the yaw jitter was due to me 'landing' it in water some time ago Thank you!

I realised that my H20 has a red PCB while the pictures in SeByDocky's review thread are showing a green PCB. I hope that the changes in the test build which fixes the yaw problem for me and others don't break compatibility with green PCB.