Accelerometer detecting side to side movements

can someone please give me an example of how you detect if the iphone is moving left or moving right. like a long version of a shake i want my app to be able to know if the users arm is going right or left. imagine your hand like a window wiper with the phone at the end

any ideas?

Thanks, Sam :开发者_如何转开发P

That would be the acceleration.x value. Imagine 3 lines going through your iPhone:
1) a line perpendicular to your iPhone screen and going through it, that would be Z.
2) a horizontal and parallel line to your screen, that would be X (what you're looking for).
3) a vertical and parallel line to your screen, that would be Y.

So, moving the iPhone left or right will generate changes in the X graph. Moving the iPhone up or down will generate changes in the Y graph. Moving your iPhone forward or backward will generate changes in the Z graph.
Hope this helps you grasp the accelerometer's concept,
~ Natanavra.