Vasile,
I sent that email for the wrong list, ivy for send for a list in portuque=
s.

Tanks by the answer, removed my doubts.

 regards,
Mauro de Amorim


----- Original Message -----=20
From: "vasile surducan" <vsurducan@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, July 05, 2005 4:15 PM
Subject: Re: Leitura analoga com um 16f628


> On 7/5/05, Mauro <mda@frg.com.br> wrote:
> > Pessoal, como fazer a leitura de um sinal analogico aplicado a um POR=
TA
> > qualquer do 16F628 ou 84A, e mostrar no LCD, com um PIC que tenha AD =
e
> > facil, mas como seria o codigo para um que n=E3o tenha?
> >
>
>   Both 16F628 and PIC16F84 does not have an AD converter module. The
> suggested way to AD with those could be different: for 16F84(or
> 16F628) using an RC and measure the charging or discharging time of
> the capacitor with the input voltage, for 16F628 having some
> comparators and reference voltage  (or filtered PWM) could be much
> more easy, just implement in software a succesive approximation
> register, or compare the input with a know DC voltage generated by
> reference voltage (4 bit resolution) or by a filtered PWM (10 bit
> resolution).
>
> Both ways are complicated since there are cheap 8bit/16bit serial AD
> converters or PIC's which have 10 bit AD module inside.
>
> regards,
> Vasile
>
> --=20
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> http://mailman.mit.edu/mailman/listinfo/piclist
>

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