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Thread: Design a calculator that can key in complex number.

  1. 24th May 2009 12:11 PM #1
    yanto_kang@yahoo.com
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    Default Design a calculator that can key in complex number.

    Hi All Expert!!

    I want to design a calculator that can key in complex number..

    I want to know how to connect 4x4 Matrix Keypad and MM74C992 16 Key Encoder on PIC18F4520 microchip..

    Your help is very much appreciated..

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  2. 24th May 2009 01:20 PM #2
    ericgibbs
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    Quote Originally Posted by yanto_kang@yahoo.com View Post
    Hi All Expert!!

    I want to design a calculator that can key in complex number..

    I want to know how to connect 4x4 Matrix Keypad and MM74C992 16 Key Encoder on PIC18F4520 microchip..

    Your help is very much appreciated..

    hi,
    Connections drawing.
    If you require the 74C922 output to hold the data, remove the invertor and connect the /OE to 0V.
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  3. 24th May 2009 01:50 PM #3
    yanto_kang@yahoo.com
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    Default Thanks a lot Eric

    Thank you Eric!!
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  4. 24th May 2009 02:41 PM #4
    Nigel Goodwin
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    It seems a complete waste to use the keypad encoder, why not just connect the keypad directly to the PIC? - it's 8 I/O pins as opposed to 5 I/O pins, but that's probably not a problem anyway.
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  5. 24th May 2009 02:53 PM #5
    yanto_kang@yahoo.com
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    Default Thanks a lot Nigel

    Thanks Nigel!!
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