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I am also interested...
maybe we can join and use both EE and programmer experience...
See ya...

Simon-Thijs de Feber wrote:

> Hi Kevin,
>
> Check this site :
>
> http://www.angelfire.com/electronic/hayles/charge1.html
>
> He did something same.
> I am designing a similar circuit and have not even
> asked tehse questions myself so i am interested in
> ideas of others / your results.
>
> grtz
>
> Simon
>
> >Hi Everyone,
> > I am attempting to build a smart battery charger for
> > NiMH batteries (8-AA), with a F877. I am going to
> > use PWM to control a LM317, and sample the voltage
> > with the ADC to look for the delta V.
> > I was planning on: (I got these from Panasonic)
> > trickle charge .05C which would be 5% duty cycle
> > Soft charge    .20C which would be 20% duty cycle
> > fast charge    .75C which would be 75% duty cycle
> > I have a couple questions:
> > 1.) What frequency should the PWM be ?
> > 2.) Anybody know a simple circuit to control the
> > LM317 with the PWM PIC pin ?
> > 3.) How often should I use the ADC to look for the
> > delta V to turn off or switch to trickle charge ?
> > Any help would be appreciated.
> >
> > Thanks,
> >         Kevin
> > PS. I am a programmer not an EE, if you couldn't
> > tell from above :)
> >
>
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