How can I calculate my speed with an iPhone?

Question

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How to calculate speed of our car using iphone

How can I calculate my speed with an iPhone? For example, I might want to measure the speed of my car when driving. How can I implement this?

score 11 · Accepted Answer · answered May 12 '12 at 20:11

11

Try something like this:

- (id) init
{
    self = [super init];
    if (self != nil) {
        self.manager = [[CLLocationManager alloc] init];
        self.manager.delegate = self;
        [self.manager startUpdatingLocation];
    }
    return self;
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"Speed = %f", newLocation.speed);
}

answered May 12 '12 at 20:11

Ashley Mills

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1

Using above code 'newLocation.speed', Getting Speed always as -1.0. – Kirti Nikam Jan 02 '15 at 07:07

score 1 · Answer 2 · answered May 12 '12 at 19:25

1>You can use GPS Use the location services to get the latitude and longitude at a particular point of time and the you can get the same after a certain period of time say t.You can get the distance traveled from Latitude and longitude and divide it by the taken to get the speed

See the Apple GPS Doc

2>You can use Accelerometer if you start from a halt, you should be able to calculate the distance you travel based off the acceleration over time of the device.

See the Apple Accelerometer Doc

How can I calculate my speed with an iPhone?

2 Answers2