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[* black] Shown in this photo is the ST LYPR540AH Tri-axis MEMS gyroscope.
[* black] Arrays of central capacitive plates oscillate two semi-annular surfaces about a central axis perpendicular to the top plane of the gyro, while arrays of sensing capacitive plates line the outer edge of the semiannular plates.
[* black] Capacitors store electrical charge between two sets of plates, and that charge induces a mechanical force between the plates. This effect is used by the driving capacitive plates to produce oscillation.
[* black] To achieve the linear displacement needed for the gyroscope to workproduce a signal, two equal masses are oscillated about the vertical axis. Since their velocities are opposite at any given point in time, external rotation (a user moving the iPhone 4) of the device will induce [link|http://en.wikipedia.org/wiki/Coriolis_effect|coriolis] forces opposite to each other, causing linear displacement.
[* black] To achieve the linear displacement needed for the gyroscope to workproduce a signal, two equal masses are oscillated about the vertical axis. Since their velocities are opposite at any given point in time, external rotation (a user moving the iPhone 4) of the device will induce [link|http://en.wikipedia.org/wiki/Coriolis_effect|coriolis] forces opposite to each other, causing linear displacement.