[Noisebridge-discuss] driving multiple LEDs with minimal batteries

T t at of.net
Tue Jan 4 22:43:54 PST 2011


http://www.instructables.com/id/LED-Throwies/

http://graffitiresearchlab.com/projects/led-throwies/


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 circuits
> > 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 seamstress!]
> >
> > > ___________
> > >
> > > 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 gallantly.
> > > 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
> >
> http://pony.noisebridge.net/~cmaier/wearables/hackerspace_meets_academia.jpg
> > 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 reasonably
> > 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:
> > http://ladycartoonist.com/2010/05/soft-circuit-kits-now-for-sale-2/
> > looks promising,
> > but I'd need to find a way to find out the design constraints
> > (minimum trace width, pitch, etc.) and feed them into an EDA program
> > (default choice at the moment is Altium, for what it's worth),
> > and have someone either do the sewing or teach me how not to mutilate
> > myself with a sewing machine and/or serger.
> >
> > Eventually, some of these DIY microchips:
> >
> http://www.facebook.com/photo.php?pid=31969144&l=6b994e53e9&id=1369525119
> > 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
> > https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >
>
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