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'[EE]: Dual digit LED display'
2001\03\22@164036 by Chris Carr

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>
> > Does anyone have a source (Mfg. or distributer) for a two digit
> "multiplexed"
> > (that's important, only 10 pins) superbright (also important) 0.56" high
> LED
> > displays with Common Anode.  Although KingsBright's website lists it
> there, they
> > do not actually have any (or at least none to send as a sample any
ways).
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gets
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2001\03\23@031047 by Bob

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-----Original Message-----
From: Bob <.....op1cwkKILLspamspam@spam@flashmail.com>
To: piclist <PICLISTspamKILLspamMITVMA.MIT.EDU>; PICBasic <.....picbasic-lKILLspamspam.....qunos.net>
Date: Thursday, March 22, 2001 3:14 PM
Subject: Dual digit LED display


>Does anyone have a source (Mfg. or distributer) for a two digit "multiplexed"
(that's important, only 10 pins) superbright (also important) 0.56" high LED
display with Common Anode.  Although KingsBright's website lists it there, they
do not actually have any (or at least none to send as a sample any ways).
Everyone makes multiplexed 3 & 4 digit displays, but I've yet to see a 2 digit
display that way.  Is there a reason for this (other than a 3 or 4 digit direct
drive would be a real layout headache)?

I've discovered that laying out the PCB traces for a single sided board for that
takes up gobs of space on my board.  Space that I can't afford.  My only other
option is to do a double sided board (ie, where do i get those little brass
through hole rivits and punch tool at, etc...).  Through hole plating gets a bit
involved and expensive, and I'd be wanting to do a minimum of through holes any
ways....  I think I may have seen some of those little rivets in the Mouser
catalog, but they won't sample me any to try out.

Any and all leads are appreciated.

Thanks in advance,

Bob.

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2001\03\23@084911 by mike

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On Fri, 23 Mar 2001 02:25:28 -0600, you wrote:

>-----Original Message-----
>From: Bob <EraseMEop1cwkspam_OUTspamTakeThisOuTflashmail.com>
>To: piclist <PICLISTspamspam_OUTMITVMA.MIT.EDU>; PICBasic <@spam@picbasic-lKILLspamspamqunos.net>
>Date: Thursday, March 22, 2001 3:14 PM
>Subject: Dual digit LED display
>
>
>>Does anyone have a source (Mfg. or distributer) for a two digit "multiplexed"
>(that's important, only 10 pins) superbright (also important) 0.56" high LED
>display with Common Anode.  Although KingsBright's website lists it there, they
>do not actually have any (or at least none to send as a sample any ways).
>Everyone makes multiplexed 3 & 4 digit displays, but I've yet to see a 2 digit
>display that way.  Is there a reason for this (other than a 3 or 4 digit direct
>drive would be a real layout headache)?
yes - they want to keep their products flexible - on a 2 digit
display, number of pins is not normally a problem.
>I've discovered that laying out the PCB traces for a single sided board for that
>takes up gobs of space on my board.  Space that I can't afford.  
Instead of using a hard-to-find muxed display (if it exists),  there
is another option, if you just apply a little lateral thinking....

It is not actually necessary for the segments of each digit to be
connected to the _corresponding_ segment of the other digit - they
could be connected to ANY segment of the other digit. The segments can be interconnected in whichever way is most convenient
for your PCB layout. The software would simply use a different 7-segment lookup table for
each digit, which would probably take no more than about 10 extra
words (7 for the table and a few to select the table depending on
digit).
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2001\03\27@190850 by Spehro Pefhany

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At 09:37 PM 3/22/01 -0000, you wrote:
>>
>> > Does anyone have a source (Mfg. or distributer) for a two digit
>> "multiplexed"
> (that's important, only 10 pins) superbright (also important) 0.56" high
>> LED

Why not just use 2 of the 3 digits in a 3 digit display?

We use thousands of these super bright displays, and it's not a bad choice,
even in fairly high quantity. Sometimes we leave one of the middle
digit(s) blank to show two independent variables.

Best regards,


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