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My new USB LCD backpack board - opinions?

Discussion in 'Electronics & Electrics' started by Goth, Jan 23, 2005.

  1. Goth

    Goth Grumpy Member

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    The AND gates and 8 pin conn are for a 4x4 matrix keypad, similar to Matrix Orbitals.

    Based on this -

    http://www.owenthegreat.com/index.php?page_path=0|2|204|214

    [​IMG]


    [​IMG]
     
  2. Slain

    Slain (Banned or Deleted)

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    what kind of lcd is it for?
     
  3. OP
    OP
    Goth

    Goth Grumpy Member

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    It should work with any HD44780, but not the dual-controller 40x4's.
     
  4. Caffeine

    Caffeine Member

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    Can hardly see the pics, but what USB controller are you using?

    I've used a few FTDI ones (www.ftdichip.com) which work well, but I've been tempted by some linx technologies USB interface chips which need no external components (www.linxtechnologies.com)
     
  5. Slain

    Slain (Banned or Deleted)

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    Is that the final PCB? Because id be inclined to make it more of a backpack sort of shape.
     
  6. OP
    OP
    Goth

    Goth Grumpy Member

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    Agreed, i was gonna do my own single sided PCB, but i may get a double sided professionally made one, then i will redesign it more compactly.
     
  7. MWP

    MWP Member

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    The problem is, what software will it work with?
     
  8. OP
    OP
    Goth

    Goth Grumpy Member

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    The PIC firmware emulates a matrix orbital serial display. So any software that supports them should be OK.

    The FT232BM driver creates a virtual serial port in software.

    (That should answer your question Caffeine)
     
  9. Caffeine

    Caffeine Member

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    Yep :) good choice.
     
  10. OP
    OP
    Goth

    Goth Grumpy Member

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    [​IMG]

    That's better, don't you think?
     
  11. Caffeine

    Caffeine Member

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    Very nice, very neat...

    Going to use the sparkfun.com PCB service?

    Would it be worthwhile adding vcc and gnd pins at both ends of the LCD header to cater for LCD's with the backlight connection at either end?
     
    Last edited: Jan 28, 2005
  12. OP
    OP
    Goth

    Goth Grumpy Member

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    I guess i will end up giving them a go,

    I will fix up the bit i hurriedly did with the autorouter, and see if i can find Vcc and ground nets in the right places :)
     
  13. fad

    fad Member

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    why not use a smd part to cut the size down,
     
  14. OP
    OP
    Goth

    Goth Grumpy Member

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    [​IMG]

    This is pretty much final, you could do double sided, or get away with a single sided DIY board and a few wire links.
     
  15. Caffeine

    Caffeine Member

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    It looks to be the same size as the LCD board, so why make it smaller? SMD parts are generally harder to get in small quantities (although we have access to hundreds of thousands of various SMD parts at work), and not quite as easy to solder.
     
  16. orbitaudio

    orbitaudio Member

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    no screw holes to mount the lcd via spacers?

    i know this is for all types of lcds, but obviously you have one in mind, and the holes are *sometimes* a standard.
     
  17. BoofyC

    BoofyC Member

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    what do you use to make the circuit boards?
     
  18. OP
    OP
    Goth

    Goth Grumpy Member

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    The design software used is CadSoft Eagle.

    The LCD's i have here a backlight DSE 16x2's, i don't know of any others that have a SIL header in the right place.

    I will add holes.
     
  19. Jenova

    Jenova Member

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    if u can get it working with a 4x20 ide be interested in buying some off u
     
  20. blancmange

    blancmange Member

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    i would be interested buying one of these units off you if you can get it working fine :) im finding it really annoying making the 16x2 LCD units from DSE as i find the wires fiddly when soldering them on the PCB, so this will help me alot :)
     

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