Yep.... some automotive instrument manufacturers have finally started usi=
ng=20
microcontrollers in "analog" gauges to compensate for the non-linearity o=
f=20
the (traditional) sensors.  The analog part is the traditional needle, wh=
ich=20
is not handled by stepper motors.  I've not specifically seen this being =
used=20
for fuel-level gauges, but definitely for boost, oil-pressure, etc.  My g=
uess=20
is that at some point, they will find it pointless to retain traditional=20
meter movements for just a handful of gauges such as fuel-level.

Cheers,
-Neil.


On Thursday 17 July 2003 15:13, Peter L. Peres scribbled:
> > Any ideas how they're doing this?  Perhaps a servo?
>
> It can be a stepper. Does it index (go to zero) sometimes ? Otherwise i=
t
> could be simply a differential instrument with deliberately high fricti=
on
> bearings. With modern magnets that should be easy. When you say it work=
s
> w/o ignition, do you mean it shows what it showed when you switched off=
 or
> does it really show what's in the tank (assuming youare filling it).
>
> Peter

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