Accelerometer. It's simple

The simplest way to use accelerometer in an iPhone application is UIAccelerometer class:

    UIAccelerometer* accelerometer = [UIAccelerometer sharedAccelerometer];

This code above shows how to get the accelerometer instance in the code.
The following line sets up the update interval:

    [accelerometer setUpdateInterval: 1.0 / 10.0f];

    [accelerometer setDelegate:self];

each 0.1 second the accelerometer will update the program that implements delegate method:

 - (void)accelerometer:(UIAccelerometer *)acel didAccelerate:(UIAcceleration *)aceler 

{

    NSLog(@"acceleration.x = %+.6f", aceler.x);

    NSLog(@"acceleration.y = %+.6f", aceler.y);

    NSLog(@"acceleration.z = %+.6f", aceler.z);

}

Do not forget to add UIAccelerometerDelegate, for example, to a view controller class:

@interface ViewController : UIViewController <UIAccelerometerDelegate>

So here is the step-by-step scenario for beginners:

1. Create new Single-View project in Xcode.

2. In ViewController.h file add <UIAccelerometerDelegate> after UIViewController.

3. In ViewController.m file, modify viewDidLoad method:

- (void)viewDidLoad

{

    [super viewDidLoad];

    UIAccelerometer* accelerometer = [UIAccelerometer sharedAccelerometer];

    [accelerometer setUpdateInterval: 1.0 / 10.0f];

    [accelerometer setDelegate:self];

}

4. In ViewController.m file, add new method:

- (void)accelerometer:(UIAccelerometer *)acel didAccelerate:(UIAcceleration *)aceler 

{

    NSLog(@"acceleration.x = %+.6f", aceler.x);

    NSLog(@"acceleration.y = %+.6f", aceler.y);

    NSLog(@"acceleration.z = %+.6f", aceler.z);

}

This program works on iPhone. It does not make much sense to test it simulator.