RoboSavvy Forum

Servo communications transiently working

2009-11-29T16:38:40+01:00

Replaced 9 potentially bad wires and the thing works a lot better.

Statistics: Posted by arekku — Sun Nov 29, 2009 4:38 pm

Servo communications transiently working

2009-11-25T16:49:49+01:00

Well given that the only variable that seems to determine whether it works or not is the state of the cables I'd be inclined to agree. I'll try to replace the cables and see what happens.

Statistics: Posted by arekku — Wed Nov 25, 2009 4:49 pm

Servo communications transiently working

2009-11-13T10:08:44+01:00

I agree with pedro, the problem comes from your cables. if they're old or rotten, you must replace them.

Statistics: Posted by Khashi.E — Fri Nov 13, 2009 10:08 am

Servo communications transiently working

2009-11-12T15:45:49+01:00

hi

we've had cases with Limor's Bioloid where the cables would work intermitently.

We first saw this with his (quite old) Bioloid at BETT 2009.
The robot would start moving correctly but after passing certain positions one of the servos would not move anymore. Shaking the servo seemed to help (which apparently restored cable continuity).

In the end we replaced the cable and it fixed the issue.

Pedro.

Statistics: Posted by PedroR — Thu Nov 12, 2009 3:45 pm

Servo communications transiently working

2009-11-12T02:03:27+01:00

If your driver is FTDI based I found it really useful to have known working software ( DynamixelManager. )

Statistics: Posted by billyzelsnack — Thu Nov 12, 2009 2:03 am

Servo communications transiently working

2009-11-11T23:23:16+01:00

There are no duplicate ID's.

There are 19 servos, ID'd 1 to 19. You can't have two actuators sharing the same ID because then one ID would be missing from the chain, thus I'd notice when lighting all the LED's.

However I use my own driver.

What's really fishy is this worked perfectly one week or two weeks ago.

Statistics: Posted by arekku — Wed Nov 11, 2009 11:23 pm

Servo communications transiently working

2009-11-11T22:59:31+01:00

Have you verified that you do not have any duplicate servo ID's?

Also. Do you have it working with the DynamixelManager that comes with the USB2Dynamixel SDK?

Statistics: Posted by billyzelsnack — Wed Nov 11, 2009 10:59 pm

Servo communications transiently working

2009-11-11T22:51:47+01:00

Sorry I've got a problem and no clue what's going on.

At the start of my program I turn on the LED on all servos and verify that the reply indicated no errors.

At first all actuators pass this test an the robot begins moving. If at any point an error would occur (overheat or no reply) the system will stop.

Now what happens after a few seconds is that the system stops due to no reply, should I attempt to start it again it'll not do it because it'll fail the LED test.

So I suspect it's either a wiring problem or a driver problem, but I'd appreciate any ideas you'd have at what's going on.

Statistics: Posted by arekku — Wed Nov 11, 2009 10:51 pm