Transcription of Tilt Sensing Using Linear Accelerometers
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Tilt Sensing Using Linear Accelerometers
Freescale SemiconductorDocument Number: AN3461 Application NoteRev. 6, 03/2013 2007-2009, 2012-2013 Freescale Semiconductor, Inc. All rights Sensing Using a Three-Axis Accelerometerby: Mark Pedley1 IntroductionAccelerometers are sensitive to both Linear acceleration and the local gravitational field. The former provides information on taps and other handset motions allowing the development of 'gesture' user interfaces while the latter provides information on the accelerometer orientation which allows a smartphone or tablet display to automatically switch between portrait and landscape application note documents the mathematics of orientation determination Using a three-axis accelerometer.
Figure 1. Electron Microscope Image of MEMS Accelerometer Proof Mass and Sensing Plates The deflection of the proof mass is measured from the change in capacitance between the fingers of the proof mass and the sensing plates. A simplified transducer model and equivalent electrical circuit are shown in Figure 2.
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