[Noisebridge-discuss] driving multiple LEDs with minimal batteries
jim at well.com
Wed Jan 5 07:21:25 PST 2011
thanks for the links.
they bring to mind the possible need for a switch
to spare battery life.
On Tue, 2011-01-04 at 22:43 -0800, T wrote:
> On Tue, Jan 4, 2011 at 20:36, jim <jim at well.com> wrote:
> the best battery i could find on short notice
> seems to be the CR2450, size and weight about
> like a quarter ($0.25), a pretty good match for
> small fabrics. it presents 3 VDC at up to 30 mA
> constant current, enough to drive a few LEDs at
> reasonable brightness.
> keeping in mind he possible requirement of
> minimal size and weight so's to be incorporated
> in a scarf or other small garment, what other
> battery is suitable?
> On Tue, 2011-01-04 at 20:21 -0800, Christoph Maier wrote:
> > On Tue, Jan 4, 2011 at 12:06 PM, meredith scheff
> <satiredun at gmail.com> wrote:
> > > I'd like to do a soft circuit scarf or three, but I'm
> always running up
> > > against the problem of power. I usually use fairly low
> power LEDs
> > > (<2v) driven by a 9v battery or one of sparkfun's LiPos.
> > > I've heard tell of somehow being able to power more, but
> I'm still learning
> > > this EE stuff. Could some kind person point me in the
> right direction?
> > > Meredith
> > >
> > > --
> > >
> > > Ladycartoonist.com
> > A MESSAGE FROM THE DEPARTMENT OF OVERENGINEERING
> > I''m sitting here in the lab of a fellow (of the IEEE),
> [ http://pony.noisebridge.net/~cmaier/wearables/lab_with_stuff.jpg ]
> > trying to make contributions to biomedical instrumentation,
> > but I'm always running up against the problem of making
> > actually comfortably wearable.
> > We usually end up using little PCBs (< quarter sized) and
> copper wires
> > or ribbon cables.
> > I've heard tell of some folks who make costumes that blink
> with sound,
> > or dresses that point north,
> > but I have no clue about this tailoring stuff.
> > Could someone match me up with a talented seamstress?
> > [For all you Terry Pratchett fans: Not THAT kind of
> > > ___________
> > >
> > > A human being should be able to change a diaper, plan an
> invasion, butcher a
> > > hog, conn a ship, design a building, write a sonnet,
> balance accounts, build
> > > a wall, set a bone, comfort the dying, take orders, give
> orders, cooperate,
> > > act alone, solve equations, analyze a new problem, pitch
> manure, program a
> > > computer, cook a tasty meal, fight efficiently, die
> > > Specialization is for insects.
> > >
> > > -Robert A. Heinlein
> > Add "design a full custom CMOS biosensor IC" to that list.
> > The little square insect in the middle of the green PCB to
> the left in
> > kept me busy enough over the last week that I missed 27C3
> > (well, at least I didn't end up in an apartment JotWeDe in
> Berlin with
> > Leif this end of year).
> > For electronics that's actually wearable,
> > I'm kind of looking for an excuse to try to build some
> > standard circuit,
> > e.g., one with an LTC4060
> [ http://cds.linear.com/docs/Datasheet/4060f.pdf ]
> > on some PCB material that is more comfortable to wear than a
> rigid PCB.
> > This kind of stuff:
> > looks promising,
> > but I'd need to find a way to find out the design
> > (minimum trace width, pitch, etc.) and feed them into an EDA
> > (default choice at the moment is Altium, for what it's
> > and have someone either do the sewing or teach me how not to
> > myself with a sewing machine and/or serger.
> > Eventually, some of these DIY microchips:
> > should end up in a wearable, dare I think washable, garment.
> > But for starters, a wearable charger for one of these
> slivery things
> > on the lab bench,
> > or an antiseptic SEPIC
> > [ http://www.diodes.com/datasheets/ZXSC380.pdf or some
> such ]
> > seems a good project.
> > Christoph,
> > playing postdoc @UCSD
> > looking for a valid excuse for one of my quarterly
> noisebridge visits.
> > _______________________________________________
> > Noisebridge-discuss mailing list
> > Noisebridge-discuss at lists.noisebridge.net
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