How to - Accelerometer [1] Fundamentals and Tilt Measurement

http://forums.parallax.com/forums/default.aspx?f=6&m=55816
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Acceleration is a measure of how quickly speed changes. Just as a speedometer is a meter that measures speed, an accelerometer is a meter that measures acceleration. You can use the ability to sense acceleration to measure a variety of things that are very useful to electronic and robotic projects and design