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Materials that trigger capacitive touch screens (iPad)

Discussion in 'General Electronics Discussion' started by Wizfinger, May 7, 2011.

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  1. Wizfinger


    May 7, 2011
    Hi, I've been Googling for capacitive materials to operate touch screens.

    I am trying to find out if there are any materials out there that can be used on the Apple iPhone or iPad, without conducting the human finger's bioelectricity.

    I can find lots of capacitive styluses out there, but they all seem to work by holding them with your hands. The application I am looking for, however, is controlling an iPad without human touch involved.

    For instance, a material that will be detected by the iPad screen when you lay the iPad flat on the table and simply place a small circular piece of said material on the screen and then let go of it.

    Or, as a second example, a small spherical object (like a marble) that rolls over the iPad and triggers the capacitive screen even when no human is touching it.

    Perhaps there are any ideas about this?

    Or would it simply be impossible because there is always some electricity needed in the object that is touching the screen? Would it, in that case, be possible to build a small battery-powered device that triggers the screen?

    Hope you can help,
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