Where Is the Accelerometer in an iPhone?

Actually, I've done this experiment before. If I have the y axis of the iPhone always pointing towards the center of the circle then the y-component of the acceleration will be constant. By recording the acceleration and angular speed, I can determine the distance from the sensor to the center of the circle. Really, it would be awesome if Vernier would let Logger Pro on your computer connect to your iPhone via wifi or bluetooth to use as a remote sensor. I knew that the angular velocity wouldn't be constant so I had a meter stick rotating on the Vernier rotation sensor.