## Changes to Step #5

Edit by Andrew Bookholt

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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 toTo achieve 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 induceslinear displacement needed to sense movement, a mechanical force between the plates. This effectplate called a proof mass is used[link|http://en.wikipedia.org/wiki/Oscillate|oscillated] by the driving capacitive plates to produce oscillationactuators.[* black] To achieveWhen the linear displacement needed for the gyroscope to produce a signal, two equal masses are oscillatedpackage is rotated about the vertical axis. Since their velocities are opposite at any given point in time, external rotation (a user movingX or Y axes (in the iPhone 4)plane of the device will inducedie surface), [link|http://en.wikipedia.org/wiki/Coriolis_effect|coriolis] forces oppositecause the plate to each other, causing equal and opposite linearmove perpendicular to the die surface. When the package is rotated about the Z axis (perpendicular to the plane of the die surface), the resulting displacement of the platesmass is in the plane of the die surface. [* black] Arrays of central capacitive plates oscillate two semi-annular surfaces about a central axis perpendicular toTo achieve 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 induceslinear displacement needed to sense movement, a mechanical force between the plates. This effectplate called a proof mass is used[link|http://en.wikipedia.org/wiki/Oscillate|oscillated] by the driving capacitive plates to produce oscillationactuators.[* black] To achieveWhen the linear displacement needed for the gyroscope to produce a signal, two equal masses are oscillatedpackage is rotated about the vertical axis. Since their velocities are opposite at any given point in time, external rotation (a user movingX or Y axes (in the iPhone 4)plane of the device will inducedie surface), [link|http://en.wikipedia.org/wiki/Coriolis_effect|coriolis] forces oppositecause the plate to each other, causing equal and opposite linearmove perpendicular to the die surface. When the package is rotated about the Z axis (perpendicular to the plane of the die surface), the resulting displacement of the platesmass is in the plane of the die surface.

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