My controller circuit is same, But i connect only one 5x7 dot matrix display to IC3 ( cd4017)
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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?Originally Posted by precision
(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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Greetings Trent,
I am now starting to build your project, I'm on stage one building 4017 sequencer. I have some question, is it possible to extend it for more characters, as of now it has seven character i want to extend it for more characters. can you please guide or give some example on how to do it. Thanks in advance....
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I don't recommend cascading anymore sections. The duty cycle is extremely low as it is. About 2.5% for each column. What this all means is that the LEDs won't be bright enough if more columns are added.
If you want to build a really huge display with a 100 or so columns, your best bet would be to use a few PIC16f877's. Break it into 4 sections - 25 columns for ea controller. The display will be nice & bright this way. Big job!
The hardest part will be in the software, making sure that ea section is properly synchronized with minimal latency. Shuffling data between ea section. On second thought - it's a masive job to do properly.
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Pictures of prototype
I just scanned in a few pics of the original prototype - thought I'd upload them.
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1563&d=1177470983" align="left">
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1564&d=1177471027">
Not bad for a single sided PCB huh?
Last edited by T.Jackson; - 25th April 2007 at 08:29.
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