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22nd March 2008, 10:23 AM
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 dot screen matrix i found a schematic for dot screen matrix on the web. i'm going to use the same original schematic but with mux 74138 i designed the attached picture is there any thing seems bad .......... | |
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22nd March 2008, 02:21 PM
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| That will work fine except that you need the resistors in the 2003 connections. Have you considered something like the MAX7219. One of these will drive an 8*8 display with multiple displays being easily implemented. Mike. | |
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22nd March 2008, 02:25 PM
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| hi Mike, My datasheet shows the ULN2003A having 2K7 resistors internal, directly TTL compatable.? Eric
__________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 7th July 2008 at 12:23 PM. | |
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22nd March 2008, 02:44 PM
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 Mike. | ||
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22nd March 2008, 09:08 PM
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 Quote:
now can i start my dot screen | ||
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23rd March 2008, 06:10 PM
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| mux 74138 is the connection of the 74138 correct. coz this is the fears time that im using this ic "mux" | |
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