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interface dartboard into the PC

Discussion in 'Electronic Design' started by Mike Zupan, Feb 21, 2004.

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  1. Mike Zupan

    Mike Zupan Guest

    So i wanted to try to interface my dart board into my computer. So i
    decided to try it through a old keyboard i had around. I took out the
    keyboard controller and hooked it up in place of the dart board
    controller. THe dart board works just like a normal keyboard with the
    two sheets of plastic that goes into the matrix decoder.

    So i got that all working and mapped out what each space on the dart
    board is. So i can touch each space and like a 20 will print a w on
    the screen. If i try to throw the dart and hits the 20.. nothing.. if
    i quickly and very lightly push the dart in then it registers.

    So my question is this.. Is there some sort of timing issue in
    keyboards? or just the keyboard i have? Like is the dart connecting
    the circuit too quickly and if so does anyone have any other
    recommendations on how to get it working?

  2. Robert Baer

    Robert Baer Guest guess is that the key needs to be pressed long enough for
    the microprocessor inside the keyboard to scan/strobe the key and "see"
    that it is pressed.
    The keys are in an X-Y matrix, and perhaps there is scanning of the
    lines by the microprocessor.
    As far as the software is concerned, i think that BASIC's INKEY
    function would do, as a form of it will wait until a key is pressed.

    Then again, if you use Windows, you could have a picture of BG on the
    screen and use a transparent keyboard..........
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