servo jitter

hi all again :)

i am getting a lot of servo jitter on my middle switch. i have them setup as

#define POSITION_1 MANUAL
#define POSITION_2 STABILIZE
#define POSITION_3 FLY_BY_WIRE_A

manual is fine, rock solid
i get a lot of constant jitter and twitch on stabilize and the imu is very still
and a little bit not as bad jitter on fly by wire

i have tried the servo optocoupler im an not 100% sure i am using it correct.

i put it between the RX and the ardupilot board and i am still getting jitter, i tried between the ardupilot board and the servo's and it kills everything, no movement from anything on any switch position.

i am running a 3cell 11.1v 5000mah battery from the ESC through the ardupilot board then onto the RX.

the wirediagram is where i put the servo optocoupler the orange square.

a few other pictures without the servo optocoupler attached.

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Samuel December 16, 2010 at 6:40am

I have the same problem. When i switch to stabilize the servo starts to jitter a bit. It does not happen in the 2.6 version, but in that version the servo reacts very dull, so i want to stick with the 2.7 version. Even if i dont change anything in the code and just upload the standard version it jitters...

anyone found the problem yet?
Richard Green September 17, 2010 at 11:23am

I have exactly the same problem with version 2.7 (the servos are rock steady in version 2.6). I raised an issue here http://code.google.com/p/ardupilot/issues/detail?id=19&can=1 concerning it. Jason thinks that it is a resource issue that can either be fixed by reducing the load on the Arduino (no GCS, no radio setup etc.) or waiting until another release uses better libraries. I could not stop my servos jittering by altering the headers so will wait until a new version is released and try again.
3D Robotics

Chris Anderson September 16, 2010 at 9:05pm

Hi Michael,

If you use the optocouplers, you need an independent power supply for the servos. That's why they don't work on the board to servo side.

Please upload your config file and I'll try to diagnose your setup.

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servo jitter

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