Go to Post As Grandma used to say, "empirical data is better than no data at all." - dlavery [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

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #43   Spotlight this post!  
Unread 18-03-2012, 18:40
Joe Ross's Avatar Unsung FIRST Hero
Joe Ross Joe Ross is offline
Registered User
FRC #0330 (Beachbots)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1997
Location: Los Angeles, CA
Posts: 8,590
Joe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond reputeJoe Ross has a reputation beyond repute
Re: Team Fusion #364, Bayou Regional, FMS Woes

Quote:
Originally Posted by RyanN View Post
We had trouble maintaining connection to FMS during the pre-match announcements. Why? No EMI, no vibrations, and we know our power is good from testing all the power and connections in the pit. At this point, all of our hardware had been replaced. Our power test consisted of probing voltages when the robot was still, everything came up clean. We then enabled teleoperated, shook, kicked, dropped, rattled the whole robot, and saw no loss of communication, no dropped packets, and no spikes in latency. I'm confident that the power on our robot is in good shape after when I did to the robot during testing. In no case would our robot be subject to the abuse I gave it.

Even more troubling is why it worked Friday night when no one else was in the venue, and why it didn't work Saturday morning when we were still the only one on the field powered up.

So yea, why would we connect and drop before the match even began? It seriously sounds like a crowded WiFi channel or a resource conflict on the FMS side of things.
Your symptoms sound exactly like ours, except that our problems did not stop when we stayed late on Friday night after everyone else left.

We did monitor the cRIO and radio power with a DMM when the dropouts occurred, and there was no change. However, replacing the power distribution board did fix our problem. I can't explain it, but it worked.
 


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 20:43.

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