Turns out I will be getting my prototype returned, so I can offer technical support to those keen on building it.
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Turns out I will be getting my prototype returned, so I can offer technical support to those keen on building it.
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I build this circuit with only one 5X7 led display ( Col 1,2,3,4,5 ), But not working. Is it necessary to built all 7 display ?
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Can you be a bit more specific - what exactly have you done & what's not working?Originally Posted by precision
As is, without great modification, it would be next to useless with just 35 LEDs.
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My controller circuit is same, But i connect only one 5x7 dot matrix display to IC3 ( cd4017)
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I see. Are you able to successfully upload a message from the Windows software to the EEPROM? If so, do any of the LEDs come on?
(You need to describe exact symptoms - theoretically, because each character is actually 5x7, I guess the circuit should show a quick flicker of single characters on 35 LEDs. There would be noticeable pauses in between. In other words, yes I believe it should do something with just 35 LEDs.
Last edited by T.Jackson; - 19th April 2007 at 04:28.
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How i confirm that i successfully upload a message from the Windows software to the EEPROM?
I also using 24c04 instead of 24c256,
will you upload eny video of working display ?
Are display something look like This video ?
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Do you realize that the 24c04 is technically different to the 24c256? You can't just whack in the 24c04 and hope for the best - it won't work without modifying the software. The 24c04 is cumbersome to work with compared to the 24c256. Byte sized addressing and bank switching complicate a relatively simple need.
Last edited by T.Jackson; - 19th April 2007 at 09:12.
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