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> > Other than that, get a reference that tells you the resistance of
> > PCB traces depending on various values, and make a PCB trace the
> > right length for the resistance you want (Eg. the 5 milliohms
> > that Sphero mentioned
>
> I wouldn't do that.  The thickness of PCB traces varies too much.
> Most PCB houses will only guarantee a minimum thickness, but not a
> maximum.  Also, 20A is a lot for a PCB trace.  It can be done, but
> you need to think about it a lot more than other traces.

Fair enough.  I said it was an option, I never said I liked it.  I
still like the hall effect sensor better.  It's simple, accurate, and
depending on the ratings of the sensor, does not vary with
temperature.

- --Brendan

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