Andy:

Your discussion of the multiplexing of columns in a large scoreboard is understandable. I use 16 of the 7x5 red displays in a scoreboard I've designed. But do you know a method in which you do the same thing with 7x5 displays with bicolor LEDs? ( Red, Green and Yellow also) .I think the hardware would become a lot more complicated.

Any suggestions would be appreciated.

-- Neri.

From: Michael Coop (pjm) <mcoop@POP.JARING.MY>
To: PICLIST@MITVMA.MIT.EDU
Date: Lunes, Diciembre 01, 1997 1:21 AM
Subject: Re: Scoreboard [OT]


Troy,

Try looking at display drivers for alphanumeric LED displays - this should
give you a good idea where to start.

The most common displays are arranged as a 5 columns x7 rows matrix, and
there are chips designed to specifically drive these displays, or for a
more economical approach to large displays, you may consider treating the
display as 'blocks' of perhaps 8x8 pixels.

Then, you can address the columns directly, or use a shift register to
'walk' along the columns one at a time, while you send 8 bits at a time to
turn the lamps on in each column as desired.

Of course you need to keep in mind the refresh rate and power available for
your particular application.

Regards
MC

On Monday, December 01, 1997 3:35 AM, Troy Powledge [SMTP:tpow@eramp.net]
wrote:
> Are we talking about the type of score boards that you see outside of
banks that display time and temp with light bulbs for pixels? If so I would
like to know how all of the individual pixels are controlled. They have to
be multiplexed some how. Any information about the system would be
appreciated.
> Processor?
> Multiplex scheme?
> Software?
> Thanks,
> Troy Powledge
> TCo. Systems
>
> -----Original Message-----
> From: Andy Tucker [SMTP:rtucker@SCCI.NET]
> Sent: Friday, November 21, 1997 7:42 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Scoreboard
>
> I am looking for the person wanting some information on scoreboards
> I have located someone who maintanes the sysyems in our county and
> he said he would like to help.
>
> Please E-mail me at rtucker@scci.net
>
> Andy Tucker
>