CODEWITHSUNDEEP
iossensorscore-motion
Satyam
Satyam

Reputation: 15904

How to find the min and max frequency interval in CoreMotion framework

In iOS CoreMotion Framework, I can set the frequency interval for accelerometer, magnetometer, etc. and capture the data at a specified interval. But it's mentioned in the documentation that, the min and max frequency is dependant on the hardware of the device. How can I know the min and max intervals that I can provide? What happens if I provide the interval value less and min interval of the hardware?

Similarly, how can I find the min and max values (full scale range) of the sensors information being provided by CoreMotion Framework?

Upvotes: 3

Views: 1707

Answers (2)

inigo333
inigo333

Reputation: 3405

Apple docs:

Choosing a Motion Event Update Interval

When you request motion data with Core Motion, you specify an update interval. You should choose the largest interval that meets your app’s needs. The larger the interval, the fewer events are delivered to your app, which improves battery life.

Table 4-1 lists some common update frequencies and explains what you can do with data generated at that frequency. Few apps need acceleration events delivered 100 times a second.

Event frequency (Hz) Usage

10–20 Suitable for determining a device’s current orientation vector.

30–60 Suitable for games and other apps that use the accelerometer for real-time user input.

70–100 Suitable for apps that need to detect high-frequency motion. For example, you might use this interval to detect the user hitting the device or shaking it very quickly.

You can set the reporting interval to be as small as 10 milliseconds (ms), which corresponds to a 100 Hz update rate, but most app operate sufficiently with a larger interval.

In a nutshell: 10Hz-100Hz

Source: Choosing a Motion Event Update Interval

Upvotes: 3

NixSolutionsMobile
NixSolutionsMobile

Reputation: 191

Please look here: https://developer.apple.com/library/prerelease/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/motion_event_basics/motion_event_basics.html Pay attention on:When you request motion data with Core Motion, you specify an update interval. You should choose the largest interval that meets your app’s needs. The larger the interval, the fewer events are delivered to your app, which improves battery life. Table 4-1 lists some common update frequencies and explains what you can do with data generated at that frequency. Few apps need acceleration events delivered 100 times a second

Upvotes: 1

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