Radio/RC Problems for 2007 Season

[Chris_Elston]

1501 had alot of problems last night. We've done everything we are suppose to do as Mike M said above. We are going to make another call to IFI today but I am not sure what good that will do. We've got ours mounted on the PVC flag pole away from metal etc..

What fixed our problem was swapping to the 2006 modems. The rest of our practice went flawless. No radio drops, no uncontrolled ramming...

I can't even imagine what that is going to do with teams that have PID installed...with the error accumulating could be asking for crash em up bash em up and it won't be your drivers fault...

If nothing else, we will sit and look pretty in the spirit of FIRST.

disappointed in Indiana...Chris Elston Team 1501

[Dave K.]

Originally Posted by Chris_Elston

I can't even imagine what that is going to do with teams that have PID installed...with the error accumulating could be asking for crash em up bash em up and it won't be your drivers fault...

See this thread for a couple different ways to see when packet loss is occuring and when the RC has disabled the outputs.

For any motor controls with an "I" term in them, you'd at least want to prohibit the integrator from accumulating additional error, otherwise when the outputs are re-enabled, the motor speed/position will jump/lunge.

For this type of system, the new RC master code actually makes the situation worse. Rather than continuing on into the wall/door/locker/ankle that the robot was aimed at prior to the radio link going down, now it will pause, accumulate error, and then accellerate into the object.