DSpic has integral function?

battery capacity should be integral of I*dt



----- Original Message -----
From: "Shawn Wilton" <black9@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, December 23, 2005 11:53 PM
Subject: Re: [EE] Detecting/Calculating battery capacities


> I'm currently working on a proof of concept.  I'll let the list know what
I
> find.
>
>
> On 12/23/05, Shawn Wilton <black9@gmail.com> wrote:
> >
> > Yeah, I need this to take less than a second.  That way I can
> > intelligently determine what current to charge the pack with.  If you
have a
> > pack with a 2Ah capacity, then you can charge it at C, but if you have a
6Ah
> > pack, then it needs to be charged at 3C (C w/ respect for the 2Ah pack).
> >
> >
> >
> > On 12/23/05, Anand Dhuru <ardhuru@vsnl.com> wrote:
> > >
> > > A long time ago, I'd seen a good idea for this requirement; basically,
> > > the
> > > pack was loaded; also the battery was used to derive a 1.5 (approx.)
> > > supply
> > > for an analog clock.
> > >
> > > How long the clock ran would give you an idea of the battery's
capacity.
> > > Of
> > > course, this might not good for absolute ma-hour values, but was very
> > > convenient for comparing batterries, as in this case.
> > >
> > > Regards,
> > >
> > > Anand
> > >
> > >
> > > ----- Original Message -----
> > > From: "Shawn Wilton" < black9@gmail.com>
> > > To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> > > Sent: Tuesday, December 20, 2005 4:43 AM
> > > Subject: [EE] Detecting/Calculating battery capacities
> > >
> > >
> > > > I've been googling for how to detect the difference between a
> > > 3(series)
> > > > cell
> > > > lithium pack and a 9(3x3) cell lithium pack.  Both supply 11.7Volts.
I
> > > > haven't found anything useful yet.
> > > >
> > > > I was thinking maybe create a dummy load, with a sense resistor and
> > > > determine how much current the pack would kick out, but that doesn't
> > > seem
> > > > to
> > > > give a different value across the packs.
> > > >
> > > > Any ideas you guys care to share?
> > > > --
> > > >
> > > >
> > > > Shawn Wilton (b9 Systems)
> > > > http://black9.com <http://black9.net>
> > > > --
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> > --
> >
> >
> > Shawn Wilton (b9 Systems)
> > http://black9.com
> >
>
>
>
> --
>
>
> Shawn Wilton (b9 Systems)
> http://black9.com
> --
> http://www.piclist.com PIC/SX FAQ & list archive
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