|
[DPRG] Dot matix programming problem
Subject: [DPRG] Dot matix programming problem
From: Dale Wheat
dale at dalewheat.com
Date: Mon Apr 14 15:41:30 CDT 2008
Francesco,
It's a common phenomenon with multiplexed LEDs called "ghosting". You need a
very brief "off" period between columns. Make sure both rows and columns are
off during this delay.
Thanks,
Dale Wheat
(972) 486-1317
(877) DALE WHEAT
http://dalewheat.com
Francesco De Comité wrote:
> Hi, I am looking for some help on a little problem I encounter, while
> trying to program a dot matrix circuit (namely KingBright TA21-11EWA),
> using microchip's PIC18F4620.
> The last dot of a column, if near from a lit pixel, also seems lit.
> What's could be the reason of that ? Any idea ?
> Wiring detail : http://www.flickr.com/photos/fdecomite/2413690327/
>
> Little video illustrating the problem :
> http://www.flickr.com/photos/fdecomite/2414510950/
>
> Source code : http://users.tvcablenet.be/personal/tvcn28401/dotmatrix.c
>
> Thanks in advance for your help !
>
> Francesco De Comité
> _______________________________________________
> DPRGlist mailing list
> DPRGlist at dprg.org
> http://list.dprg.org/mailman/listinfo/dprglist
>
More information about the DPRG mailing list
|
