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lcd´s issue

Discussion in 'Electronic Design' started by enigma, Oct 12, 2005.

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  1. enigma

    enigma Guest

    Hello , I would like to request some help with the next:
    I have a lcd display that i take from a fax printer he is driven by one
    HD44780A00 microcontroler type and y would like to make a realtime
    information panel to aplly on my car so that he displays something like
    "door open,hatchback open etc ... " i looked around in the net but i didnt
    find any circuit that i could aplly, i know that we must have a program to
    programe the lcd but i think that i need too, an analogique to digital
    converter so that the negative signal of 12 volts on one input pin could
    cause the light up of the characters adressed to that event , if someone
    could help me on how to do this or have or create some kind of shematic that
    i can aplly i really would thank, i love to mess around with electronics i
    know how to make pcb´s and small circuits and to aplly digital gadjets in my
    car , but i don´t have the needeed knowledge to create that kind of
    circuits, thank you!

    Obs : Sorry for my bad english ,but i´m portuguese and its the best i know
  2. Joerg

    Joerg Guest

    This is more complicated than you think. The HD44780 expects data words
    that are usually sent 4 bits at a time. Without another micro controller
    or a rather large array of logic chips with a memory chip I don't think
    you can do what you want.

    Best is to study the HD44780 data sheet.

    Theoretically you could cook up some logic circuitry that resets and
    pipes data out of an EPROM everytime an event occurs.

    Regards, Joerg
  3. Rich Webb

    Rich Webb Guest

    A display based around the HD77480 and work-alike chips is really fairly
    easy to use. A good reference is the "Character LCD User's Manual" which
    is linked at the bottom of the page at
    Usually the hardest thing to get right the first time is the
    initialization sequence. There is a flow chart in the manual; follow it
    and you'll be OK.

    You will want to control the display with a microcontroller of some
    kind. If you're just starting out, perhaps one of the Parallax "Basic
    Stamp" modules would be a good fit.
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