[dorkbotpdx-blabber] Advice on large LED matrix

[Mr.T]

perhaps i've missed it in the previous emails, but i'm not clear on what 
exactly you're trying to do. are you trying to drive an array of LED's in 
a "color spotlight" type device? i.e one that has many bright, multicolor 
LED's all tuned to the same color. or are you trying to drive a matrix of 
multi-color LED's in a display type configuration?

_____________________________
Drtwist:
drtwist at aracnet.com

On Tue, 9 Dec 2008, dan p wrote:

> There is a way called Charlieplexing, the problem for your project might be
> brightness. The downside is that due to strobing the brightness is divided.
> If you need max brightness this sort of multiplexing isn't the way to go.
> 
> On Tue, Dec 9, 2008 at 10:05 AM, Mykle Hansen <mykle at mykle.com> wrote:
> 
> > i'm interested in this question as well.  i've been told
> > that N shift-registers, combined with an arduino, can
> > control N^N or so LEDs.  but then a friend sent me this
> > article about how to control a small LED array with no
> > shift registers.  it only lets you strobe the LEDs one
> > at a time, but due to POV it can work, at least up
> > to some limiting size of grid.
> >
> >
> > http://www.instructables.com/id/How-to-drive-a-lot-of-LEDs-from-a-few-microcontrol/
> >
> > i think someone actually showed me this at a dorkbot meeting
> > a month ago, and i recall staring at it and not getting
> > it at all.  but now i do.  a handy trick, for sure.
> >
> > (there's another instructable linked from that one which
> > goes into the theory of this -- calling it "charlieplexing"
> > -- and it's a pretty easy read, for electronics:
> >
> > http://www.instructables.com/id/Charlieplexing-LEDs--The-theory/
> > )
> >
> > at any rate, controlling N output lines from one arduino
> > will be a recurring need for humanity.  if there are
> > other classic approaches with pros and cons, i'd love to
> > read a summary.
> >
> > -m-
> >
> >
> > On Dec 9, 2008, at 12:16 AMTuesday, dalas v. wrote:
> >
> > I'm thinking of building a matrix of RGB LEDs. Brightness is a priority.
> >> Size would be maybe 1 or 2 square feet. Battery power would be preferred,
> >> but if there is a need for AC power, I'd need to use a prebuilt power
> >> supply, because I don't want to attempt making one. Minimum control would be
> >> 32 color options (preferably more), maybe you can program 8 - 12 sequences
> >> and switch between them?
> >>
> >> It seems like the arduino might be able to handle this? It would be my
> >> first arduino project. I know that it can control LED matrices and
> >> sequences, how would it be for a large matrix and how big / bright can I
> >> get?
> >>
> >> I'm in the really early stages with this, so any advice or links to kits
> >> would be appreciated.
> >>
> >> -dalas
> >>
> >>
> >>
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