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Unread 25-03-2009, 20:18
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AKA: BOB
no team (4FX Design)
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Join Date: Apr 2008
Rookie Year: 1998
Location: Tampa, FL
Posts: 105
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Re: Discrepancy at Chesapeake, Israel, Waterloo?

Quote:
Originally Posted by Alan Anderson View Post
For those of you complaining about the time it takes for the 2009 FRC control system to "link up with the field", my observation is that it's really a very quick process, on the order of five or ten seconds. What takes time is the cRIO booting up and starting to run the user code.
WGA is ~15 seconds to boot
DS is 10 to 20 seconds depending on how fast it identifies its USB devices
cRio can boot in as fast as 10 seconds (what I've seen in the shop, mine don't have a bunch of user code in them though)

I've seen WGAs link with the field AP in <2 seconds, and then I've seen them take as long as 20 seconds in the field, and I've seen some that don't link at all It all comes back to how much RF interferrence the WGA is getting from the robot. I.e. where the radio is placed in relation to metal bulkheads, motor controllers, relays and a multitude of other RF noisey things on the bots. this has been a common theme in many of my posts. I saw someone used my "it worked in our lab" comment, and the fact is, maybe it did work in your lab, but was marginal "in your lab", get out to the competition field with other RF competing devices and maybe it won't work..... That was the point. If you have one point of referrence and you know someone else that literally had hundreds, I'd go with that advice.

RF is voodoo, many things can affect it, treat with as much respect as you can.....
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Harvest CROO Robotics and 4FX Design

Last edited by pitzoid : 25-03-2009 at 20:24.
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