> How critical is the resistance with temperature - could you use a
> copper wire or pcb track?
> And what is the actual power dissipation?

Track was what I was thinking of, should be repeatable in theory.
Or at least consistent for a given run of boards anyway

Dissipation is low. The comparator is set at 60mV, and resistor
(with one end at ground) voltage is 0V (motor off) or 90mV (motor
on). Start current for motor is 2A, generally runs at 1.5A-ish for
a very short while, no more than 15s. It's an adjustment arrangement
with a driven screw thread. In that situation you can feel no warmth
with a 0R47 1/4W, so a track or piece of wire would be fine

Temperature ? As above, no significant heating apparent and
ambient is never out of comfort zone

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