#define kAccelerationThreshold 2.2

//Somewhere in initialization

UIAccelerometer *accel = [UIAccelerometer sharedAccelerometer];

accel.delegate = self;

accel.updateInterval = 1.0f/10.0f;

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {

if (fabsf(acceleration.x) > kAccelerationThreshold || fabsf(acceleration.y) > kAccelerationThreshold || fabsf(acceleration.z) > kAccelerationThreshold) {

NSLog(@"Shaking!!!");

}

}