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???
02/13/07 21:25
Modified:
  02/13/07 21:26
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 		 #132836 - no, just old fashioned
Responding to: ???'s previous message
Have I got it all wrong?

no, just old fashioned. Multiplexing was in vogue when chips cost money, today you can drive LEDs without multiplexing for $0.03 - $010 per LED see my suggested chips above.

If you multiplex (old, tried and true) you will get layers upon layers of complexity once you start implemeting things like intensity control, scrolling etc.

YES, everything CAN be done with multiplexing, just so much more cumbersome and - in addition - harder on the LEDs shortening the lifetime of them.

this should not be an issue, but if you plan on laying out the lightboard manually, using serial drivers will make it 1000 times easier.

Just a note: make sure you get matched LEDs, a board where some are in one end of the tolerance and some in the other looks horrible. Matched LEDs are just a penny - or less - more than ordering just by the same partnumber.

Erik

List of 29 messages in thread
TopicAuthorDate
Dot matrix display AT89S52 based            01/01/70 00:00      
   Maxim            01/01/70 00:00      
   have a look at            01/01/70 00:00      
   in my calculator...            01/01/70 00:00      
      I calculated it as            01/01/70 00:00      
         no, just old fashioned            01/01/70 00:00      
            The a6278 looks good            01/01/70 00:00      
               The sole concern here is HEAT!            01/01/70 00:00      
                  Heat is not going to be a problem            01/01/70 00:00      
                     I'd go with whicever your distributor has in stock            01/01/70 00:00      
                        Ok, I\'ll go with the A6278            01/01/70 00:00      
                           can't help you            01/01/70 00:00      
                              I can be reached at            01/01/70 00:00      
                                 info mailed            01/01/70 00:00      
                                    Thanks Erik            01/01/70 00:00      
                     This can be done VERY simply ...            01/01/70 00:00      
                        HUH?            01/01/70 00:00      
                           There are lots of unasked questions ...            01/01/70 00:00      
                              for a beginner...            01/01/70 00:00      
                                 will do - or will not            01/01/70 00:00      
                              it is - till            01/01/70 00:00      
                     RE ABOUT YOUR ?            01/01/70 00:00      
                        That's very kind of you,            01/01/70 00:00      
                        the phrase that comes to mind is            01/01/70 00:00      
         Multiplexed pins            01/01/70 00:00      
            I ceed to Erik            01/01/70 00:00      
               with a caveat            01/01/70 00:00      
         not quite so wrong...            01/01/70 00:00      
   Aside: ports and pins            01/01/70 00:00      

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