Go to Post That is just ridonkulous. - Brandon Holley [more]
Home
Go Back   Chief Delphi > Technical > Programming
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
Thread Tools Rate Thread Display Modes
  #16   Spotlight this post!  
Unread 02-02-2012, 00:49
slijin's Avatar
slijin slijin is offline
Pockets
AKA: Samuel Lijin
FRC #0694 (StuyPulse)
Team Role: Mentor
 
Join Date: Jan 2010
Rookie Year: 2010
Location: New York City
Posts: 537
slijin is a splendid one to beholdslijin is a splendid one to beholdslijin is a splendid one to beholdslijin is a splendid one to beholdslijin is a splendid one to beholdslijin is a splendid one to beholdslijin is a splendid one to behold
Re: Too many PWM's shorting out power?

Quote:
Originally Posted by el_pablo View Post
Scenario 1
With the Axis camera, when running the 2 step motor, one of them starts to skip. Adding a third motor, both of step motors jitters.
To add to Alan's response, check to make sure that the frame of the Axis camera is isolated from the robot's, as the Axis camera is grounded to its frame.
__________________

2010-12 CT Chairman's
2011 Galileo 5th seed
2010 NY Regional Winners
  #17   Spotlight this post!  
Unread 02-02-2012, 10:18
el_pablo el_pablo is offline
Registered User
AKA: Nicolas Bourré
FRC #4007
Team Role: Mentor
 
Join Date: Feb 2012
Rookie Year: 2012
Location: Canada
Posts: 8
el_pablo is an unknown quantity at this point
Re: Too many PWM's shorting out power?

Here is a video I made yesterday during the testing.

It's in french but I wrote in a previous post what is happening.


Youtube video here


As you can see, it jitters even when not running.

Here is a screen shot of our begin.vi


Here is the teleop code


Thanks for helping
  #18   Spotlight this post!  
Unread 02-02-2012, 12:51
Alan Anderson's Avatar
Alan Anderson Alan Anderson is offline
Software Architect
FRC #0045 (TechnoKats)
Team Role: Mentor
 
Join Date: Feb 2004
Rookie Year: 2004
Location: Kokomo, Indiana
Posts: 9,113
Alan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond repute
Re: Too many PWM's shorting out power?

el_pablo:

When you said "step motor" before, did you mean "servo"?

You're defining the camX and camY servos, but you never command them to move.

The nouveauMotor device reference is not defined in Begin. You should be seeing an error message on the Driver Station telling you about that.

I can't see YouTube videos from where I am, but I'm going to guess that you haven't installed the servo power jumpers next to the PWM pins on the Digital Sidecar for the camera servos. If they are indeed being powered, then a "twitch" is usually an indication that they're not getting a PWM signal, and are just picking up noise on the wires.
  #19   Spotlight this post!  
Unread 02-02-2012, 13:59
el_pablo el_pablo is offline
Registered User
AKA: Nicolas Bourré
FRC #4007
Team Role: Mentor
 
Join Date: Feb 2012
Rookie Year: 2012
Location: Canada
Posts: 8
el_pablo is an unknown quantity at this point
Re: Too many PWM's shorting out power?

Sorry my mistake, they are servos not stepmotors.

The diagrams show the second scenario which includes 2 jags + 1 victor and no servo. Althought they are declared we don't use them in this test case.

Concerning the servos, the power jumpers are installed.

We started the project using the default template. Should I delete a few things before coding?

Thank you
  #20   Spotlight this post!  
Unread 02-02-2012, 14:16
el_pablo el_pablo is offline
Registered User
AKA: Nicolas Bourré
FRC #4007
Team Role: Mentor
 
Join Date: Feb 2012
Rookie Year: 2012
Location: Canada
Posts: 8
el_pablo is an unknown quantity at this point
Re: Too many PWM's shorting out power?

Just figured out that in the begin.vi there were some "junk" declaration out of the screen in which some PWMs were in conflict...

I hope this is source of the problem.

Closed Thread


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 01:06.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi