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10x7 LED SignBoard (MERRY X MAS)

Discussion in 'Microcontrollers' started by Gayan Soyza, Dec 19, 2006.

  1. Mike - K8LH

    Mike - K8LH Well-Known Member

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    You should find the Data Sheet when looking up the part number on the DigiKey web site or perhaps the Micrel web site. The Micrel MIC5821 and MIC5841 are almost identical to the Allegro A6821 and A6841 devices.

    I'm not aware of higher density serial-to-parallel high-current sinking drivers. If you find some, please let me know? Thanks.

    Happy 2007... Mike
     
  2. Mike - K8LH

    Mike - K8LH Well-Known Member

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    BTW, those hardware schemes grew out of designs for high performance reduced I/O designs for multiple 7-segment displays.

    Have fun. Mike
     

    Attached Files:

  3. don.vito

    don.vito New Member

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    ee sorry, where is the source codes? where can i find them? (basic, C, asm or hex)
     
  4. dave

    Dave New Member

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  5. JFDuval

    JFDuval New Member

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    Hello!

    I'll ask the same question that Chief11 : what was the software used for your schematics?

    Thanks,
     
  6. Mike - K8LH

    Mike - K8LH Well-Known Member

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    The drawings were done using the built-in drawing tools in Microsoft Excel 2000. Here's another example;

    [​IMG]
     
    Last edited: Apr 8, 2007
  7. JFDuval

    JFDuval New Member

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    Ok. What is the advantage of doing so (except the visual appareance) if you need to redo it before making a PCB?
     
  8. Mike - K8LH

    Mike - K8LH Well-Known Member

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    Why would I need to redo it before making a PCB board?
     
  9. JFDuval

    JFDuval New Member

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    I mean, with a regular PCB suit, you can export your schematic directly to your board, follow the wires and route.

    With Excel, I don't think it is as simple?
     
  10. Mike - K8LH

    Mike - K8LH Well-Known Member

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    I manually place components and route my own PCB designs.
     
  11. JFDuval

    JFDuval New Member

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    Ok, it's what I was understanding. From my point of view, this solution is too time consuming and can leads to errors (their is no direct link between schematic and PCB), but, you probably have reasons to do so!

    More positively: your schematics look better than any one made from a commercial package!
     
  12. Mike - K8LH

    Mike - K8LH Well-Known Member

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    Thank you for the compliment. I suspect it is more work but I was hoping to make the drawings seem more visually interesting and intuitive.

    Regards, Mike
     
  13. Sceadwian

    Sceadwian Banned

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    You should use something like Eagle for the crude start out trace, learning to use it is smarter than learning to place manually yourself. After it's placed it's traces you can tweak them to your hearts content. Doing the whole thing from start to finish on your own is really a waste of time, no matter how good you get at it.
     
  14. Gayan Soyza

    Gayan Soyza Active Member

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    Ya MS Office Packages does a great job also MS Paint.We wont consider much of these built in tools we mostly Prefer to advanced schematic design softwares. In my case I Preffer MS Excel for Schematics.It's So fun & very Creative.In the begining it takes some time to draw & after having experience can work quickly.

    Thankx Mike for ur coloured Schematics.It's very useful.
     
  15. Mike - K8LH

    Mike - K8LH Well-Known Member

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    Someone uploaded that EPE "Giant LED Message Display" article on EDAboard in this thread; Led Message Display EPE Mag 2006/11

    The Author actually did a very nice job coming up with a cohesive comprehensive 'system' for driving 5x7 matrix display modules. The design doesn't include row drivers and can't drive the displays to full brightness and doesn't include PWM brightness/fade control but is nonetheless a reasonably well thought out design.
     
  16. linc85

    linc85 New Member

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    Help me to design LED Matrix 12x12 using 8255 and 8085

    Help me out anyone,pls...
    Tell me how the LED function...
    and help me with a microprocessor program...
    Thanks
     
  17. Sceadwian

    Sceadwian Banned

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    Yet another thread brought back from a restful grave by a first time poster with an unanswerable question.

    42
     
  18. pasanlaksiri

    pasanlaksiri Member

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    Bravo Gayan.
     
  19. Peter_wadley

    Peter_wadley New Member

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    Nicely done Gayan!
     
  20. v-nay

    v-nay New Member

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    can anyone help me for the same project...(Scrolling LED message Display) using AT89c51????
    im in real problem...
    can anyone help me?
     
  21. charmrus

    charmrus New Member

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    if you look at an LED to long that your eye's will sparkle
     

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