AVR-Chat

I guess he doesn't supply the source code for the PIC?
:-(

Zack

On Mon, Mar 15, 2010 at 10:38 AM, Terrance <evilterrance@hotmail.com> wrote:

>
>
> Look here: http://www.angelfire.com/electronic/hayles/charge1.html
>
> I built a couple just like this...works very well. Good information on this
> site, anyways.
>
>
> --- In AVR-Chat@yahoogroups.com <AVR-Chat%40yahoogroups.com>, "syberraith"
> <syberraith@...> wrote:
> >
> > I looked that up already. It's a 10C rise accompanied by a 10mV drop, at
> least according to PowerStream datasheets.
> >
> > The simple voltage cutoff is actually for recharging disposable
> alkalines, cutoff at 10% of rated voltage. :)
> >
> > Fred
> >
> > --- In AVR-Chat@yahoogroups.com <AVR-Chat%40yahoogroups.com>, Dennis
> Clark <dlc@> wrote:
> > >
> > > Hi,
> > >
> > > Your method of checking voltage to determine cutoff would work
> > > somewhat for LiIon cells but not so well for NiMh. NiMh have a pretty
> > > flat discharge curve and their charge curve is best served by
> monitoring
> > > temperature rise, the "peak" voltage of an NiMh is subtle and not
> always
> > > easy to catch without some pretty good charge circuitry. I'd have to
> > > look up the optimal temperature rise to detect a full charge, I forget
> > > the details. Check out battery sites to get more charge details.
> > >
> > > DLC
> > >
> > > On 3/14/10 6:45 AM, syberraith wrote:
> > > > I'm unsure if I want to go straight to my final design in one step. I
> might want to build a simple/limited version first. For my most simple
> version I have the current being regulated by a linear regulator, and all
> the controller needs to do it turn it off when the system reaches a set
> voltage.
> > > >
> > > > More elaborate versions could include such things as pre-testing
> charge state, and automatic discharge of any remaining charge before
> charging. However, my goal at the moment is just to get a simple one done
> and working.
> > > >
> > > >
> > > >
> > > > --- In AVR-Chat@yahoogroups.com <AVR-Chat%40yahoogroups.com>,
> Philippe Habib<phabib@> wrote:
> > > >
> > > >> I think that pretty much anything with an ADC would be enough. You
> > > >> could also get something with built in PWM so you could vary the
> > > >> charge voltage as the charge nears completion. The ATMega 16HVA,
> HVB,
> > > >> and 32HVA, HVB are designed to be chargers. You could also go with a
> > > >> general purpose device.
> > > >>
> > > >> Finally, although you can get by with a 6 or 8 pin chip for what you
> > > >> want, you might want to go with more pins so you can dedicate pins
> to
> > > >> the programming header.
> > > >>
> > > >>
> > > >> On Mar 13, 2010, at 11:01 AM, syberraith wrote:
> > > >>
> > > >>
> > > >>> I want to build a battery charger with a bit of intelligence, just
> a
> > > >>> bit.
> > > >>>
> > > >>> I would like the charger to check the battery voltage every so
> > > >>> often, one a minute at most, and if it has reached a set value, I
> > > >>> would like the charger to shut it self off.
> > > >>>
> > > >>> I would also like charging to commence with a push of button to
> > > >>> prevent a power interruption from starting a new charging cycle.
> > > >>>
> > > >>> To accomplish this I was wondering what device would be
> > > >>> appropriate. All it has to do is control a relay, and have a single
> > > >>> ADC.
> > > >>>
> > > >>> Any suggestions?
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> ------------------------------------
> > > >>>
> > > >>> Yahoo! Groups Links
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>
> > > >
> > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > >
> > > --
> > > Dennis Clark
> > > TTT Enterprises
> > >
> >
>
>  
>


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