Thanks Vasile, those were the tips I was looking for.

>
>> 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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