Rochester, 25 februari 2006.

Dear Tia,

It is likely that you'll have to "massage" your input signal to comply
with the requirements of the A/D input pin: scale down the voltage,
and possibly use an OPAMP to increase impedance (see a previous
discussion about this on this same list). What is more relevant is the
frequency of your signal: if it is too high, the A/D converter will be
too slow to convert it. With the AC transformer I assume you're
measuring a 50 Hz signal, which should be no problem for any PICmicro
with A/D converter.

Displaying the result on an LCD is a different story, but at 50 Hz
should certainly be possible. Most graphical LCD don't have a fixed
response time, so they might "hang" for a while occasionally as you
write to them. An interrupt buffering the A/D conversions is a
solution there.

Greetings,
Maarten Hofman.
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