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Unread 04-03-2012, 11:40
JABot67 JABot67 is offline
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AKA: John Bottenberg
FRC #2930 (Sonic Squirrels)
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Re: Your take on CAN...

Quote:
Originally Posted by techhelpbb View Post
When some or all of the Jaguars cut out, do they do it at the exact same moment?
Usually that is the case.

Quote:
Originally Posted by techhelpbb View Post
Are all the units you loose sequential in the CAN chain?
No, they can but are usually not sequential in the CAN chain.

Quote:
Originally Posted by techhelpbb View Post
When you tried the window motor did you use a fully charged battery?
Yes, we used a fully charged battery. We have experienced and characterized the issues that occur on the CAN bus when the battery power is low.

Quote:
Originally Posted by techhelpbb View Post
You know when you suddenly shift the direction of your possibly 130lb robot you have to fight all the mechanical momentum of the robot that was previously moving the other way. You absorb that extra force with a surge of power from your battery. The more you suddenly shift the direction as hard as possible the greater the surge.
The error occurs even when the robot is barely moving. Our driver knew about this issue in the competition yesterday and purposely tried to avoid throwing the weight of the robot around. During no point in the match did he try going full speed forward (actual robot speed, not the speed of the wheels) to full speed reverse. The error mostly occurred when he was trying to turn. Turning does not absorb as much energy as a sudden shift from full forward to backward.

Quote:
Originally Posted by techhelpbb View Post
Hence why the automatic ramp helps because you slowly absorb that energy...not all at once.
Is there a good value for the automatic ramp that allows us the maximum amount of control possible without causing damage or disablement of the Jaguars? We were unable to find a good value.
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John Bottenberg - University of Michigan '14 - Microsoft
FLL Team "Dark Matter": 2003-2005
Robofest Team "Dark Matter": 2005-2008
Team 67 Programmer: 2007-2010
Team 3322 Programming Mentor: 2012-2014
Team 2930 Engineering Mentor: 2015-????
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