[dorkbotpdx-blabber] Advice on large LED matrix

[dalas v.]

More of a color spotlight type of device, and I would be satisfied with just having a color spotlight, although it would be nice to have more complex animations if it wasn't much more cost/effort.

Travis, how many I need would depend on how large I can get LEDs? I wouldn't want there to be more than a 1/2" gap between LEDs.

-dalas


--- On Tue, 12/9/08, Mr.T <drtwist at aracnet.com> wrote:

> From: Mr.T <drtwist at aracnet.com>
> Subject: Re: [dorkbotpdx-blabber] Advice on large LED matrix
> To: "A discussion list for dorkbot-pdx (portland,  or)" <dorkbotpdx-blabber at dorkbot.org>
> Date: Tuesday, December 9, 2008, 10:59 AM
> 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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> > >
> > >
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