Either look up the theory of SAR A/D converters, or for very easy (but
slow) operation: just adjust the PWM value up or down one step depending
on the comparison of the (filtered!) A/D value and the analog input. The
PWM setting is your (slowly tracking) conversion result.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of michael brown
> Sent: Monday, December 16, 2002 11:40 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: Which PIC should I use?
>
>
> On Monday 16 December 2002 02:56 pm, you wrote:
>
> > - use the PWM + comparator of a 16F628 as a (slow) DIY A/D
> >
> > Wouter van Ooijen
>
> Could you point me somewhere on how to do this?  I only need about 10
> A/D conversions per second.
>
> michael brown
>
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