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'[TECH]I bet our LED guru hasn't thought of this!'
2009\11\27@025533 by cdb

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face
LED clothing!

All it needs now is a solar panel as a hat to provide the power or
some mechanism to turn body movement into a gyroscopic power
generator.

<www.elektor.com/news/london-designer-duo-create-dress-with-24-
000-leds.1166352.lynkx?utm_source=UK&utm_medium=email&utm_campaign=new
s>

Colin
--
cdb,   3/07/2009

--




spam_OUTcolinTakeThisOuTspambtech-online.co.uk

2009\11\27@051207 by Russell McMahon

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> LED clothing!

<http://www.elektor.com/news/london-designer-duo-create-dress-with-24-000-leds.1166352.lynkx?utm_source=UK&utm_medium=email&utm_campaign=new>

>
>  All it needs now is a solar panel as a hat to provide the power or
> some mechanism to turn body movement into a gyroscopic power
> generator.
>
> <www.elektor.com/news/london-designer-duo-create-dress-with-24-
> 000-leds.1166352.lynkx?utm_source=UK&utm_medium=email&utm_campaign=new
> s>

Dunno who the LED guru is, but PV panel in hat is definitely on the
maybe list. Basic ideas have been tossed around but not tried yet.

As for the clothing - so far I've only managed a PIC controlled
"angel's halo" for my daughter, long long ago. It was a real hit.
Basic left and right light chaser and several flashing patterns which
changed in sequence. Add gliitery string and some furry stuff and
viola. Very effective in the dark. Not so good in higher light levels.

I know an aspiring clothing designer who would love to build something
around a LED array.

It is by no means original, but a useful headlight could be reasonably
well served by a PV panel that could be comfortably enough fitted into
a cap. Top of head may be best insolationally, but top of peak of a
cap would probably be more practical. You could probably hope for
about 50% of full output on average in bright sunlight. Shading would
need to be avoided or dealt with.

In a multiple in series PV cell system the current output is
approximately limited to the output of the most shaded cell (unless
shunting diodes are fitted.) Shade one cell badly and ther whole panel
output plunges.

One way to deal with shading is to use a single PV cell so that the
output is proportional to mean illuminatiion of the whole cell. You
then have to deal with the very low voltage of say 0.2 to 0.6 Volt
depending on shading. People offer ICs that boost from this level
using synchronous conversion to help efficincy, but the FETs need to
have nicely low Rdsons and tracks and wiring and inductor need careful
attention. Up conversion efficincies of over 85% are claimed by some.
It would be really easy to get less than that if great care was not
taken.

I've considered mechanical body movement generation of various sorts
but done only basic playing. Hand crank units usually don't give more
than a Watt or so (I've measured them) - but this is usually due to
the shocking mechanicals. I can get 10 Watts with no apparent effort
from foot or hand "pedalling", 50 Watts can be done continually with
not too much effort, 100 Watts is bearable for long peruiods but
annoying. Higher starts to be real exercise (for me). I can personally
do 500 Watts pedalling for only perhaps 10 seconds. (Gossamer Condor
piloting will never be within my reach).





              Russell McMahon

{Quote hidden}

>

2009\11\27@053730 by Tamas Rudnai

face picon face
Hmm, last Christmas I bought these to my son:

working clock t-shirt:
http://www.argos.ie/static/Product/partNumber/0244440/Trail/searchtext%3ETSHIRT.htm

equalizer t-shirt:
http://www.argos.ie/static/Product/partNumber/9002229/Trail/searchtext%3ETSHIRT.htm

Both of them are ok-ish -- breaks quite easy but looks nice! I still
could not figure out how of those LEDs work :-)

Tamas


On Fri, Nov 27, 2009 at 7:55 AM, cdb <colinspamKILLspambtech-online.co.uk> wrote:
{Quote hidden}

>

2009\11\28@121750 by Alan B. Pearce

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>I've considered mechanical body movement generation of various sorts
>but done only basic playing. Hand crank units usually don't give more
>than a Watt or so (I've measured them) - but this is usually due to
>the shocking mechanicals. I can get 10 Watts with no apparent effort
>from foot or hand "pedalling", 50 Watts can be done continually with
>not too much effort, 100 Watts is bearable for long peruiods but
>annoying. Higher starts to be real exercise (for me). I can personally
>do 500 Watts pedalling for only perhaps 10 seconds. (Gossamer Condor
>piloting will never be within my reach).

This week on one of the UK TV channels there is a program where they put a
family in a house, but is disconnected from the grid, and all power is
supplied by people on cycle generators - but they don't tell the family. The
result sounds a bit hilarious (requires 74 cyclists peddling hard to power
the on demand shower unit). Program is apparently being done as a
demonstrator of how wasteful we are with energy.


2009\11\28@152137 by Russell McMahon

face picon face
> ... supplied by people on cycle generators - but they don't tell the family. The
> result sounds a bit hilarious (requires 74 cyclists peddling hard to power
> the on demand shower unit). Program is apparently being done as a
> demonstrator of how wasteful we are with energy.

Pedalling hard on an exercise machine makes a cold shower attractive
after about 10 minutes.

On demand shower can work OKish on say 6 kW and 200 Watts is a
bearable pedalling load. so 6000/200 = 'only' 30 cyclists and you'd
manage les than that if needs be.

100 Watts is doable for say 1 hour - annoying but bearable.
100 Watt hours would run say 8 hours x 12 Watts = 4 x 2 Watt lights =
a very useful amount of light for 4 rooms with good LEDs.


            Russell.

2009\11\29@073138 by Jake Anderson

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Tamas Rudnai wrote:
> Hmm, last Christmas I bought these to my son:
>
> working clock t-shirt:
> http://www.argos.ie/static/Product/partNumber/0244440/Trail/searchtext%3ETSHIRT.htm
>
> equalizer t-shirt:
> http://www.argos.ie/static/Product/partNumber/9002229/Trail/searchtext%3ETSHIRT.htm
>
> Both of them are ok-ish -- breaks quite easy but looks nice! I still
> could not figure out how of those LEDs work :-)
>
> Tamas
>
>  
they are electroluminescent not LED.

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