The Sensors in your iphone. Dr Alasdair Allan

Size: px

Start display at page:

Download "The Sensors in your iphone. Dr Alasdair Allan"

Owen May
5 years ago
Views:

1 The Sensors in your iphone Dr Alasdair Allan

2 Available Hardware Hardware Features Original iphone iphone 3G iphone 3GS 1st Gen ipod touch 2nd Gen ipod touch 3rd Gen ipod touch Cellular Wi-Fi Bluetooth Speaker Audio-In Accelerometer Magnetometer GPS Proximity Sensor Camera Video Vibration

3 The GPS (Core Location)

4 Core Location Abstraction layer Cell towers (12km falling to 1-3km) Skyhook wireless (approx. 100m) GPS (approx. 40m)

5 Core Location LocationManager = [[CLLocationManager alloc] init]; locationmanager.delegate = self; if( locationmanager.locationservicesenabled ) { [locationmanager startupdatinglocation]; } else { }...

6 Distance filters locationmanager.distancefilter = 1000; // 1km

7 Desired accuracy locationmanager.desiredaccuracy = kcllocationaccuracykilometer;

8 Delegate methods - (void)locationmanager:(cllocationmanager *)manager didupdatetolocation: (CLLocation *)newlocation fromlocation:(cllocation *)oldlocation { if( newlocation!= oldlocation ) {... } } - (void)locationmanager:(cllocationmanager *)manager didfailwitherror: (NSError *)error {... }

9 The Accelerometer

10 +Y Z Y +Z X +X

11 Declare a AccelController : UIViewController <UIAccelerometerDelegate> { } UIAccelerometer

12 Start accelerometer - (void)viewdidload { } accelerometer = [UIAccelerometer sharedaccelerometer]; accelerometer.updateinterval = 0.1; accelerometer.delegate = self; [super viewdidload];

13 Measure acceleration - (void)accelerometer:(uiaccelerometer *)meter didaccelerate:(uiacceleration *)acceleration { float x = acceleration.x; float y = acceleration.y; float z = acceleration.z; float angle = atan2(y, x); }...

14 Orientation Portrait (angle = -1.5) Landscape Left (angle = 3.0) Landscape Right (angle = 0.0) Upside Down (angle = 1.5)

15 The Magnetometer (The Digital Compass)

17 Core Location LocationManager = [[CLLocationManager alloc] init]; locationmanager.delegate = self; if( locationmanager.locationservicesenabled && locationmanager.headingavailable) { [locationmanager startupdatinglocation]; [locationmanager startupdatingheading]; } else { }...

18 Heading filters locationmanager.headingfilter = 5; // 5 degrees

19 Delegate method - (void)locationmanager:(cllocationmanager *) manager didupdateheading:(clheading *) newheading { // If the accuracy is valid, process the event. if (newheading.headingaccuracy > 0) { CLLocationDirection theheading = newheading.magneticheading; } }...

20 True heading CLLocationDirection trueheading = newheading.trueheading;

21 Calibration panel - (BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager *)manager { } return YES;

22 The Camera

23 Declare a TakePicture : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate> { } IBOutlet UIButton *button; UIImage *picture; UIImagePickerController (nonatomic, retain): UIImage (nonatomic, retain): UIImagePickerController *pickercontroller; -

25 Present the pickercontroller; - (IBAction)getPicture:(id)sender { } self.pickercontroller.delegate = self; self.pickercontroller.sourcetype = UIImagePickerControllerSourceTypeCamera; [self presentmodalviewcontroller:pickercontroller animated:yes];

27 Controller finishes - (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info { } [self dismissmodalviewcontrolleranimated:yes]; self.picture = [info objectforkey:@"uiimagepickercontrolleroriginalimage"]; self.pickercontroller.delegate = nil; (void)imagepickercontrollerdidcancel:(uiimagepickercontroller *)picker { } [self dismissmodalviewcontrolleranimated:yes]; self.picture = nil; self.pickercontroller.delegate = nil;

28 The Proximity Sensor

30 Turn monitoring on UIDevice *device = [UIDevice currentdevice]; device.proximitymonitoringenabled = YES; BOOL state = device.proximitystate;

31 Set notifications [[NSNotificationCenter defaultcenter] addobserver: self object: device];... - (void) proximitychanged: (NSNotification *)note { } UIDevice *device = [note object]; NSLog(@"In proximity: %i", device.proximitystate);

com/ By: Alasdair Allan Publisher: O'Reilly Media, Inc.

32 Questions? Learning iphone Programming By: Alasdair Allan Publisher: O'Reilly Media, Inc. Last Updated on Safari: November 19, 2009 Pub. Date: March 15, 2010 (Estimated) Print ISBN: Print ISBN-13:

Location Enabled Sensors

Location Enabled Sensors Making use of the sensors on your iphone and ipad Dr Alasdair Allan, Babilim Light Industries This class will guide you through guide you through developing applications for the