Mark Bellamy wrote :

> I don't see how ADC can be usful without a multiply and divide
> instrution to calcuate the actual voltage value...

Why do you need the actual voltage value ? The ony reason I
can think of is to put it on an LCD. If you're transfering the
values to (e.g.) an PC, it might be easier to do the ADC to
actual voltage conversion on the PC instead.

Note that you can use a volt.ref such as the ADC readings
are in millivolt directly. Or you can put a voltage devider (and
an opamp) before the ADC to make the scaling on the "A"
side of the ADC. Then it's also pretty easy to implement
multi-range measuring.

Jan-Erik.



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