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Unread 08-03-2010, 15:36
Mark McLeod's Avatar
Mark McLeod Mark McLeod is online now
Just Itinerant
AKA: Hey dad...Father...MARK
FRC #0358 (Robotic Eagles)
Team Role: Engineer
 
Join Date: Mar 2003
Rookie Year: 2002
Location: Hauppauge, Long Island, NY
Posts: 8,900
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Re: Classmate Static Discharge Susceptibility

If you mean on the field...
The Classmates were already powered up and USBs installed when they arrived and connected to the field Ethernet cable.
Most Classmates were running all day. The Driver account must be logged out after a match and logged back in.

Lots of variations on what was plugged in and where.
I'll use one team as an example, Dustin or Nick can correct me since I wasn't there every time, but 816:
  • First had the Stop button directly connected to the left Classmate USB port. With the hub to the right port with three joysticks.
  • Second had the red hub USB connected to the left Classmate port and the black one to the right.
  • Third, directly connecting just the two drive joysticks corrected the problem, but left them without kicker control.
The common factor seems to have been the HSB hub, and seems to be due to a faulty USB hub or hub cable.
I'll be carrying a spare USB hub cable or two at the next event I work to perform a quick to test when this happens again.

But the solution for teams in the middle of a match is probably to design your controls to have a backup alternative USB configuration that just uses two joysticks directly connected to the Classmate. And be mentally prepared to repatch on the fly.
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Last edited by Mark McLeod : 09-03-2010 at 11:03.
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