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Membrane keyboard as low-force sensor

Discussion in 'Electronic Design' started by Jean-Marc Delaplace, Mar 12, 2007.

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  1. Hi everyone,

    I have an application where I need to sense a mechanical force of about
    5 gf, that is 0.05 N. I need an array of such sensors, and that they be
    waterproof. The array would have a pitch of about 15 mm. I think of
    having a membrane keyboard specially designed to operate at such a low
    force. According to some manufacturers, it is possible, and according to
    others, it is not.
    An additional requirement is that in the application the force is
    exerted almost permanently, and is occasionally removed but most of the
    time the force is applied. My concern is the capability of the membrane
    keyboard to open its contact even after months of continuous activation
    but say one minute release each day.
    Can you advise me a technology that would meet these requirements? A
    manufacturer ?
    Thanks in advance.
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