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Finger detection

Discussion in 'Electronic Components' started by Aart van Beuzekom, Sep 21, 2005.

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  1. Hi,

    I'm looking for a key that not only can switch but also detect if a
    finger is present on the key. Preferrably no touch-screen-like solution,
    but rather a piezo-electrical single key for PCB mounting. I've been
    searching the complete internet for the latter, without finding any
    solution. The nearest I come is a piezo switch that gives out open or close.
    Does anyone have any suggestions? Or comment why nobody invented a
    simple piezoelectrical key yet?


  2. Tim Shoppa

    Tim Shoppa Guest

    Or comment why nobody invented a
    Today's keyboards are crappy enough. Piezo keys would make them worse
    especially with regard to tactile feedback, it'd be as bad
    as a membrane keyboard.

    The very best keyboards I ever used were Hall-effect switches, probably
    cost $1000 for an ASCII keyboard in the 1970's when that was real
    money. What made these so good is that the switch just moves a magnet,
    it doesn't have to make electrical contact with anything, so they can
    make mechanics just right to give the perfect feel to the typist.

    That said, I think what you want would be called a "touch switch" or
    "capacitance switch" or "capacitance proximity switch" and consists of
    a metal sensor pad.

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