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Why does the accelerometer read zero G's?

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Why does the accelerometer read zero G's when it's in free fall?

All accelerometers are used to measure increasing or decreasing acceleration, and they can detect vibration because it is a change in acceleration between multiple directions.  Free fall, by definition, is a static acceleration, which means the object may be moving, but its acceleration is not changing at all.  SDI's MEMS DC accelerometer technology allows it to measure free fall because it doesn't require any change of acceleration to supply data, and therefore it will report back 0g of acceleration.