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From Finger to Swipe

The glass does not feel pressure in the ordinary sense. Your finger changes an electric field, and nearby electrodes register the resulting capacitance shift.

  • r/gadgets - Fingertip wearable lets you feel virtual textures on touchscreens
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Under the glass, transparent electrodes form intersecting rows and columns. In mutual capacitance, a finger generally reduces their coupling by diverting the electric field.

  • Example of a Capacitive Sensing System
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The controller scans the grid by driving X lines and reading Y lines, then compares each measurement with a baseline to calculate the changed touch coordinates.

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Coordinates become a time series. Software tracks each touch point and its movement, then recognizes a swipe. That invisible electrical event becomes a visible command.

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