<div><br></div><div><br></div><div><a href="http://www.instructables.com/id/LED-Throwies/">http://www.instructables.com/id/LED-Throwies/</a></div><div><br></div><div><a href="http://graffitiresearchlab.com/projects/led-throwies/">http://graffitiresearchlab.com/projects/led-throwies/</a><br>
<br></div><div><br><div class="gmail_quote">On Tue, Jan 4, 2011 at 20:36, jim <span dir="ltr"><<a href="mailto:jim@well.com">jim@well.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br>
<br>
the best battery i could find on short notice<br>
seems to be the CR2450, size and weight about<br>
like a quarter ($0.25), a pretty good match for<br>
small fabrics. it presents 3 VDC at up to 30 mA<br>
constant current, enough to drive a few LEDs at<br>
reasonable brightness.<br>
keeping in mind he possible requirement of<br>
minimal size and weight so's to be incorporated<br>
in a scarf or other small garment, what other<br>
battery is suitable?<br>
<div><div></div><div class="h5"><br>
<br>
<br>
<br>
<br>
On Tue, 2011-01-04 at 20:21 -0800, Christoph Maier wrote:<br>
> On Tue, Jan 4, 2011 at 12:06 PM, meredith scheff <<a href="mailto:satiredun@gmail.com">satiredun@gmail.com</a>> wrote:<br>
> > I'd like to do a soft circuit scarf or three, but I'm always running up<br>
> > against the problem of power. I usually use fairly low power LEDs<br>
> > (<2v) driven by a 9v battery or one of sparkfun's LiPos.<br>
> > I've heard tell of somehow being able to power more, but I'm still learning<br>
> > this EE stuff. Could some kind person point me in the right direction?<br>
> > Meredith<br>
> ><br>
> > --<br>
> ><br>
> > Ladycartoonist.com<br>
><br>
> A MESSAGE FROM THE DEPARTMENT OF OVERENGINEERING<br>
><br>
> I''m sitting here in the lab of a fellow (of the IEEE),<br>
> [ <a href="http://pony.noisebridge.net/~cmaier/wearables/lab_with_stuff.jpg" target="_blank">http://pony.noisebridge.net/~cmaier/wearables/lab_with_stuff.jpg</a> ]<br>
> trying to make contributions to biomedical instrumentation,<br>
> but I'm always running up against the problem of making circuits<br>
> actually comfortably wearable.<br>
> We usually end up using little PCBs (< quarter sized) and copper wires<br>
> or ribbon cables.<br>
> I've heard tell of some folks who make costumes that blink with sound,<br>
> or dresses that point north,<br>
> but I have no clue about this tailoring stuff.<br>
> Could someone match me up with a talented seamstress?<br>
> [For all you Terry Pratchett fans: Not THAT kind of seamstress!]<br>
><br>
> > ___________<br>
> ><br>
> > A human being should be able to change a diaper, plan an invasion, butcher a<br>
> > hog, conn a ship, design a building, write a sonnet, balance accounts, build<br>
> > a wall, set a bone, comfort the dying, take orders, give orders, cooperate,<br>
> > act alone, solve equations, analyze a new problem, pitch manure, program a<br>
> > computer, cook a tasty meal, fight efficiently, die gallantly.<br>
> > Specialization is for insects.<br>
> ><br>
> > -Robert A. Heinlein<br>
><br>
> Add "design a full custom CMOS biosensor IC" to that list.<br>
> The little square insect in the middle of the green PCB to the left in<br>
> <a href="http://pony.noisebridge.net/~cmaier/wearables/hackerspace_meets_academia.jpg" target="_blank">http://pony.noisebridge.net/~cmaier/wearables/hackerspace_meets_academia.jpg</a><br>
> kept me busy enough over the last week that I missed 27C3<br>
> (well, at least I didn't end up in an apartment JotWeDe in Berlin with<br>
> Leif this end of year).<br>
><br>
> For electronics that's actually wearable,<br>
> I'm kind of looking for an excuse to try to build some reasonably<br>
> standard circuit,<br>
> e.g., one with an LTC4060 [ <a href="http://cds.linear.com/docs/Datasheet/4060f.pdf" target="_blank">http://cds.linear.com/docs/Datasheet/4060f.pdf</a> ]<br>
> on some PCB material that is more comfortable to wear than a rigid PCB.<br>
> This kind of stuff:<br>
> <a href="http://ladycartoonist.com/2010/05/soft-circuit-kits-now-for-sale-2/" target="_blank">http://ladycartoonist.com/2010/05/soft-circuit-kits-now-for-sale-2/</a><br>
> looks promising,<br>
> but I'd need to find a way to find out the design constraints<br>
> (minimum trace width, pitch, etc.) and feed them into an EDA program<br>
> (default choice at the moment is Altium, for what it's worth),<br>
> and have someone either do the sewing or teach me how not to mutilate<br>
> myself with a sewing machine and/or serger.<br>
><br>
> Eventually, some of these DIY microchips:<br>
> <a href="http://www.facebook.com/photo.php?pid=31969144&l=6b994e53e9&id=1369525119" target="_blank">http://www.facebook.com/photo.php?pid=31969144&l=6b994e53e9&id=1369525119</a><br>
> should end up in a wearable, dare I think washable, garment.<br>
><br>
> But for starters, a wearable charger for one of these slivery things<br>
> on the lab bench,<br>
> or an antiseptic SEPIC<br>
> [ <a href="http://www.diodes.com/datasheets/ZXSC380.pdf" target="_blank">http://www.diodes.com/datasheets/ZXSC380.pdf</a> or some such ]<br>
> seems a good project.<br>
><br>
> Christoph,<br>
> playing postdoc @UCSD<br>
> looking for a valid excuse for one of my quarterly noisebridge visits.<br>
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</div></div></blockquote></div><br></div>