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Thread: Controlling HD44780 LCD via USB??

  1. #1
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    Jan 2001
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    8

    Post Controlling HD44780 LCD via USB??

    Has this been done? Where can I find info on it? I have 2 Seiko LCD's, a 4x40 and a 4x20. I will be using Linux as my OS, so that may be a problem, too. Can any of you guys help me out here? Thanks

  2. #2
    Variable Bitrate
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    Aug 1999
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    Yorba Linda, CA
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    If you're looking for an off-the-shelf solution, your best bet is probably a USB to parallel converter module and just run the standard parallel port LCD control software. Companies like Digi ( www.digi.com ) and others sells these. I'm not sure if the parallel port adaptors work well under Linux, as I haven't tested them myself yet. Has anyone done this and had success?

    If you want to built a circuit, I believe Microchip ( www.microchip.com ) has a new PIC chip with USB capabilities built-into it. You could also try searching the web for a USB microcontroller or USB prototype board. I've seen small boards with a USB type B connector on them and the necessary IC's to convert the data to parallel format suitable for interfacing with a microcontroller.

    That's all I can think of right now. Let us know what you find out.

    -Jason
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

  3. #3
    Maximum Bitrate
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    Mar 2001
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    Perth, Australia
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    Post

    Buy a parrallel port card pci that will let you control both under linux.

  4. #4
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    Post

    I believe he was asking specifically about _USB_. It's a good idea since the cable is smaller and power is included in it
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

  5. #5
    Variable Bitrate
    Join Date
    Mar 2001
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    292

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    So get a parallel to usb adapter, but use a short parallel cable and a long USB cable.

    I don't know of any LCDs that come with USB interfaces.. so unless you want to get a program a stamp...
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