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  1. - 7th October 2005, 13:53 #1
    Acetronics2's Avatar
    Acetronics2
    Acetronics2 is offline Fanatical Contributor
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    Smile 1 line interrupted keypad reading

    Only one line for 12 buttons ... without polling !!!

    see here : http://www.edn.com/contents/images/33105di.pdf

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************
  2. - 7th October 2005, 14:18 #2
    Mike_Lynch's Avatar
    Mike_Lynch
    Mike_Lynch is offline Junior Member
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    I came across another circuit, Same concept, this one built
    around a 74HC14 Schmitt inverter. Just FYI
    http://www.elecdesign.com/Articles/P...ArticleID=1869

    ML
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