How can I find the velocity using accelerometers only?

Question

Using only the phone\'s (Android) built in accelerometer, how would I go about finding its velocity?

I have been tinkering with the maths of this but whatever funct

Answer 1

First, you have to remove the acceleration due to gravity from the accelerometer data. Then it's just a matter of integrating the acceleration to get the velocity. Don't forget that acceleration and velocity are properly vectors, not scalars, and that you will also have to track rotation of the phone in space to properly determine the orientation of the acceleration vector with respect to the calculated velocity vector.