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4wire analog touch problem

Discussion in 'General Electronics' started by christoph pfeiffer, Oct 29, 2003.

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  1. i have connected a 4wire analog(resistive) touchpanel to my cop8

    for measurement the supply is directly done with the cop i/o pins. no
    problem in generall.

    but on measuring the voltage in y-direction i have a drift of the measured
    voltage. y-voltage on the left side is different to
    the y voltage on the left touch side if the y-position is constant.

    this effect is not visible on the x-measurement.

    anybody a solution ?
    which switching fet are used usually in this application.

    regards chris
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