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'[EE:] LED demo projects'
2007\01\28@162747 by Cedric Chang

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I am going to be doing a presentation for laymen
about LEDs.  I will have an LCD projector.

I would like to show photos or 30 second videos of cool
LED projects that anyone has built.

examples:

spinning wheels that write messages
high power LEDS ( 160lm Cree ? )
laser diodes


Best

CC

2007\01\28@172811 by Jinx

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"Clock Watchers" LED Clock Kit

http://www.jaycar.co.nz

Cat No KC5404

Two videos of clock working

http://www.jaycar.com.au/downloads/movie.wmv

http://www.jaycar.com.au/downloads/clock02.wmv

2007\01\28@183158 by William Chops Westfield

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On Jan 28, 2007, at 1:27 PM, Cedric Chang wrote:

> I would like to show photos or 30 second videos of cool
> LED projects that anyone has built.
>
There's a bunch of stuff at http://www.instructables.com :

www.instructables.com/id/E2K9BN5EDKEUBYRD9V/
www.instructables.com/id/EAZWM7SMGAEWIFNUSK/
www.instructables.com/id/EQ8CBZBN7DEP286MR8/
www.instructables.com/id/E6N46V6SY6EP286HT3/
www.instructables.com/id/E7Y1MAP6SOET2JXPD2/
www.instructables.com/id/E9D2ZJ3FG0EP286JEJ/
www.instructables.com/id/E8N7KI5I90EV2ZF5PW/
www.instructables.com/id/E7T5DWKOJ3ERIE2V2P/
www.instructables.com/id/E1JGG4LGHBEV2ZJ7HS/
http://www.instructables.com/id/ED0NCY0UVWEP287ISO/ (mine!)
http://www.instructables.com/id/EWXN8GM8ZIEP287BNP/ (mine too. LEDwise,
     this is very basic; it's more about designing PCBs.)

and MORE!

BillW

2007\01\29@201446 by M. Adam Davis

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There are a number of LED 3D cube displays out there as well.  I don't
have the link, but a pretty simple 4x4x4 RGB display doesn't cost a
lot anymore.

-Adam

On 1/28/07, Cedric Chang <spam_OUTCedricTakeThisOuTspamnope9.com> wrote:
{Quote hidden}

> -

2007\01\29@212607 by William Chops Westfield

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> I would like to show photos or 30 second videos of cool
> LED projects that anyone has built.
>

Oh.  There's Mark Lotter's burning man stuff, if you're into excess...

http://www.nw.com/nw/projects/cubatron
http://www.nw.com/nw/projects/brc
http://www.youtube.com/watch?v=nDTWe_Q9b2U

BillW

2007\01\30@073207 by Howard Winter

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Jinx,

On Mon, 29 Jan 2007 11:27:34 +1300, Jinx wrote:

> "Clock Watchers" LED Clock Kit
>
> http://www.jaycar.co.nz
>
> Cat No KC5404

There's also KC5416, the same thing with blue LEDs.

Now I've always thought that Jaycar's prices were a bit strange, but it seems that Cat No AR1788 is a version of LC5416 that's ready-built and with a
nicer case (IMHO), and it's half the price of the kit - it's even cheaper than the red LED version that you mention!

I know that building a kit is useful education, but this seems like a very expensive way of getting it!  :-)

Cheers,


Howard Winter
St.Albans, England


2007\01\30@150719 by Jinx

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> Now I've always thought that Jaycar's prices were a bit strange, but
> it seems that Cat No AR1788 is a version of LC5416 that's ready-
> built and with a nicer case (IMHO), and it's half the price of the kit -
> it's even cheaper than the red LED version that you mention!

Ah, the mysteries of the market. As you say, $120 (built) vs $228 (kit)
is an awfully big disparity. You could buy AR1788s, strip them down,
and sell them as KC5416s on TradeMe ;-)

2007\01\30@220246 by Vitaliy

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Jinx wrote:
>> Now I've always thought that Jaycar's prices were a bit strange, but
>> it seems that Cat No AR1788 is a version of LC5416 that's ready-
>> built and with a nicer case (IMHO), and it's half the price of the kit -
>> it's even cheaper than the red LED version that you mention!
>
> Ah, the mysteries of the market. As you say, $120 (built) vs $228 (kit)
> is an awfully big disparity. You could buy AR1788s, strip them down,
> and sell them as KC5416s on TradeMe ;-)

Chinese-built device that our company was selling, cost $5 in large
quantities. When a school requested a quote for the kit version of this
device, we calculated that the parts alone would cost about $10 per kit,
even in quantities of 100. There are of course other costs, for example
packaging the kits, writing the assembly manual, maintaining adequate
inventory of/reordering each part, etc. So just to break even, we would have
to sell it for $15.

It is certainly understandable that the school thought it was a rip-off. :)
The students would have to pay x3 for each kit, and then spend an hour to
put the thing together.

Although it's not that we were trying to overcharge them for the kits, it's
that economies of scale allowed us to sell the assembled device cheaper. The
only reason oscilloscopes are so much more expensive than TVs (or computers,
in case of digital scopes), is that there are fewer of them, and each scope
absorbs a greater share of the overhead costs.

Vitaliy


2007\01\31@000635 by James Nick Sears

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I did this a month or so ago:
http://jamesnsears.com/projects/orb
video here (100MB, be patient):
http://jamesnsears.com/video/orbVideo01.mov

have another, more over-the-top version coming up, but nothing to  
show yet.

These are nice and by a recent grad of my school:
http://jamesclar.com/product/index.html

and another by a guy at my school:
http://itp.nyu.edu/~lpm248/advMicro/LED/

-n.



On Jan 28, 2007, at 4:27 PM, Cedric Chang wrote:

{Quote hidden}

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