On Sat, 2 Feb 2002, Kevin A. Benedict wrote:

> Hi Everyone,
> I just coded up some software to use the ADC on
> the F877, I was just wondering if their is anything
> I should be aware of when sampling my voltage source ?
> I am a programmer and still learning electronics,
> I have a power supply and was planning on sampling
> the voltage at the lowest current setting from 0 to 5V.
> Anything I should look out for or be aware of hardware-wise ?
>
  It could work ( only once ! ) clock-wise polarity reversed...[grin]
Of course you have to respect input polarity ( +0...+5V ). An antifoul
input protection circuit ( a 5v6 zenner from ad input to gnd and 470 ohm
from ad input to your signal source is also a good thing ).
Measuring both the current and the output voltage of your supply is a
little tricky because you have only one ground input in your PIC.
But is possible.
regards, Vasile

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