Hello! I know that there has been much discussion about usefully interpreting acceleration data. The phone I'm testing on doesn't have a gyroscope, so can't do sensor fusion and can't output linear acceleration. As my (measuring) app would only need to measure acceleration in the y-direction, I wondered if I could use a gravity resultant vector to approximate y-movement. Therefore as a test I took the 3 accelerometer readings and combined them into a resultant vector, which i hoped would have magnitude 9.81. It doesn't. With the phone lying on the table it gives about 8.5, but this changes in different orientations. Ideally it would be at 9.81 whenever the device was stationary. Am I missing something, or are the sensors just too noisy/not accurate enough? Should I just give up on this as nobody seems to have been able to make a device track position yet? I don't have a device to test linear acceleration on, but am guessing that it's still really not good enough.
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