iphone - iPhone 中加速度计的最大采样率

Question

有人知道iphone加速度计的最大采样率是多少吗？我想要有高更新率。我将其 updateInterval 设置为 1.0/300.0但似乎我没有得到那么多的更新率。

那么任何人都可以告诉我我们可以获得的最大更新率是多少或者我如何获得高更新率。

Answer 1

iPhone 6 上的最大加速度计和陀螺仪采样率为100Hz。您可以自己凭经验进行测试。这是代码。

/******************************************************************************/
// First create and initialize two NSMutableArrays. One for accel data and one
// for gyro data. Then create and initialize CMMotionManager.  Finally,
// call this function

- (void) TestRawSensors
{
   speedTest = 0.0001; // Lets try 10,000Hz
   motionManager.accelerometerUpdateInterval = speedTest;
   motionManager.gyroUpdateInterval = speedTest;


    [motionManager startAccelerometerUpdatesToQueue: [NSOperationQueue currentQueue]
    withHandler: ^(CMAccelerometerData  *accelerometerData, NSError *error)
    {
       [rawAccelSpeedTest addObject: [NSNumber numberWithDouble: accelerometerData.timestamp]];
       [rawAccelSpeedTest addObject: [NSNumber numberWithDouble: accelerometerData.acceleration.x]];

       if (error)
       {
          NSLog(@"%@", error);
       }

       if (rawAccelSpeedTest.count > 100)
       {
          [motionManager stopAccelerometerUpdates];

          for (uint16_t i = 0; i < rawAccelSpeedTest.count; i+=2)
          {
             NSLog(@"Time: %f   Accel: %f", [rawAccelSpeedTest[i] doubleValue],
                                            [rawAccelSpeedTest[i+1] doubleValue]);
          }
       }
    }];


   [motionManager startGyroUpdatesToQueue: [NSOperationQueue currentQueue]
                              withHandler: ^(CMGyroData *gyroData, NSError *error)
    {
       [rawGryoSpeedTest addObject: [NSNumber numberWithDouble: gyroData.timestamp]];
       [rawGryoSpeedTest addObject: [NSNumber numberWithDouble: gyroData.rotationRate.x]];

       if (error)
       {
          NSLog(@"%@", error);
       }

       if (rawGryoSpeedTest.count > 100)
       {
          [motionManager stopGyroUpdates];

          for (uint16_t i = 0; i < rawGryoSpeedTest.count; i+=2)
          {
             NSLog(@"Time: %f   Rate: %f", [rawGryoSpeedTest[i] doubleValue],
                                           [rawGryoSpeedTest[i+1] doubleValue]);
          }

       }
    }];
}