I have started this dedicated thread at the suggestion of another contributor.
This issue has was raised on the main 'Arducopter 2.8 / 2.8.1 released' thread and can be viewed here.
http://www.diydrones.com/forum/topics/arducopter-2-8-released?commentId=705844%3AComment%3A1022742
I'm still puzzled by this twitching, however look at the latest log from today and in a little more detail I can see a very small change in the THR IN trace which appears to be directly connected at the time all the motors twitch (see below).
Is the THR IN trace taken straight from the Rx ?
Not only have I done the things as detailed in the main thread, but I have also:
Grounded the aircraft (in case of interference)
Repositioned Rx to top stack
Reprogrammed all ESC
I have attached the latest log.
Would dropping the ESC Update Speed in MP from 490 - 400hz help ?
Any suggestions would be appriciated, in the mean time i am trying to get hold of a duplicate Rx. Any chance it could be the APM ?
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Many thanks for your sterling efforts in nailing this problem.
Official firmware for APM 2.x released.
ArduPPM_v2.3.13_ATMega32U2
I have problems uploading my files. i try later may be the host is down or something.
Can anyone give a time frame as to when this issue will be resolved ie: new PPM encoder released.
The reason I ask, instead of remaining just patient, is I have been asked by a power company to pull some lines over rough country, and as I use Futaba and get these spikes, I would really, really like to get this problem resolved, as everything else in the system is working so well.
I have a test platform that I would be happy to use to do any additional testing if that would help any.
But the heavy lift drone is NOT something you want to be around if it glitches.
OK I am using Futaba 14MZ on mine if that could help you too !!!!
I have been testing an evaluation version of the PPM encoder and thanks to the developers the results are very good.
As some may have seen from this and other posts, the problem of twitching has been plaguing me for months ever since I built this, my first Hex.
Despite numerous fault finding exercises including visiting the UK Futaba service centre, I was not having any success. I was just about to replace ESCs nd motors when the Devs thankfully stepped in and rewrote some of the PPM encoder firmware.
Having benched tested the APM for a couple of hours now, I haven't seen any twitches at all on my logs.
It would appear that the twitching issue was unique to Futaba radios and my R6208SB receiver.
Testing will continue and I'm sure once its stability is confirmed, it will be released to the masses.
Big thanks again to the devs, particularly Olivier. Stay tuned :-)
Have you tryed the capaciter on one of the RX channels ?
APM2.5 new running 2.8.1 FW
Futaba T9CHP with TM-8 FASST module
R6208SB Rx
Pronounced glitches in flight, especially with a fresh battery.
Reviewed the logs and the spikes appear on the -IN channels.
Have purchased a brand new Tx (the same model) and the same spikes happen.
Steven, you can see the same twiching in my video of the release 2.8.0 at "1:07" (pump up the volume), two little twiching:
https://www.youtube.com/watch?v=YvTj6dlQ9fo
I remember that once these "twiching" I got shot the drone in the air during take-off, as you, saved because it is anchored on a network of protection.
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