rcasha

I'm developing an application which measures the accelerometer values to indicate how much the phone is being shaken. At the moment I'm just using the Z value, which works if the phone is lying flat on its back.
Is there any formula to combine x + y + z in order to give the value irrespective of the orientation of the phone?

metter

If you mean what I think you mean:

If only Z it's Z.
X+Z it's: VALxz^2=X^2+Z^2
X+Y+Z it's: VALxyz^2 = VALxz^2 + Y^2



Hope that helps. Cheers.

DaveInNYC

My answer is somewhat close to what Metter said, but if I understand your question correctly, you want to get the amount of acceleration irrespective of direction. If that is the case, the value you would be looking for is the root of the sum of the squares:

absolute value = sqrt(X^2 + Y^2 + Z^2);

See The Pythagorean Theorem for details.

rcasha

What I mean is: "How much is the phone being shaken - whether up and down, or sideways, or diagonally, etc?"

DaveInNYC: Thanks, that's what I needed.

Last edited by rcasha; November 15th, 2009 at 10:20 AM. Reason: thx to correct answer

metter

And that's exactly what I wrote. I just left you some thinking