Hello Francisco,

> You need calibrate the A/D and eliminated any source of external noise,
> if you take a read whit volmeter conect this affect the reading of your
> PIC.

    What do you mean by calibrating the A/D?

> Too, can you make whit software a filter for the input of your A/D

    Mmmm, you mean making more than one reading and than calculating the
middle value? I'm now making 64 reading, summing it all and dividing by 64.
The value is much more stable this way... but sloooowwwww. (hehe)

    Regards and thanks,

    Brusque

+------------------------+
|     Edson Brusque      |
| Research & Development |
|  www.citronics.com.br  |
+------------------------+