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Unread 30-12-2014, 10:04
Joe Johnson's Avatar Unsung FIRST Hero
Joe Johnson Joe Johnson is offline
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Re: paper: New Control Functions - Drive System Testing

I'm not your typical beat up on FIRST type guy but this seems like a really poorly designed system feature.

In the first place it seems to me that a small amount of money together with some clever EE thinking could have allowed all critical brain functions of the FRC control system to remain alive well down to battery voltages as low as we'd like (e.g. 1-2 volts).

In the second place, once you've decided to go down the path of load shedding, this seems like a not very clean implementation. By going with "all off" rather than scaling you pretty much guarrantee crazy and unwanted behavior. A simple scaling reduction scheme would make these brown out events almost unnoticeable for the vast majority of teams.

In the third place, a prioritzed and scaled load shedding seems like the obvious right thing to do. Teams should be given a way to let the system shed load in ways that make sense for that robot at that time (e.g. run this function that provides a list of motors to turn off, motors to scale, and motors to leave at full power or to scale as a last resort...).

From the outside looking in, it seems like FIRST missed an opportunity to do the right thing here.

Dr. Joe J.
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