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APM 2.6 3.1-RC2 Octocopter Alt-Hold motor "pulsing"

Posted by MR on October 9, 2013 at 6:47am

I'm having problems with APM 2.6 running 3.1-RC2 on Octocopter. Stabilize works well, but Alt-Hold and any other "automatic mode" like Loiter or RTL is problematic. I've tried default PIDs and played around with them but no luck. The main problem is rather strange motor behavior.

A picture from datalog is attached, note the throttle on Alt-Hold. I'll also include a photo showing Accel X, Y and Z vibrations, which should be OK.

What could be the problem? Has anyone gotten Alt-Hold to work well on 3.1rc2 Octocopter and is willing to share the values?

altholdthr.png

Accel.png

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31rc2, althold, loiter, octocopter, rtl

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Replies

Diego Fdez. November 2, 2013 at 9:36am

Hello Randy,

I'm checking the vibrations of my copter, and was on the normal range.

I have exactly the same problem of this user: Shyam Balasubramanian http://diydrones.com/forum/topics/arducopter-3-0-1-released?comment...

Please, can you help us?

Regards.
Diego Fdez. October 30, 2013 at 3:39pm

Hello,

I have the same problem with 3.1RC4 on a Quad. How to solve this?

Regards.
Rob_Lefebvre October 9, 2013 at 7:01am

It's quite possible this is the processor loading problem on Octos. This type of behaviour is what led to my investigation which is when I discovered the problem.