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How to determine heart rate without using any tool in iOS sdk?

I am currently working on one application where I need to know the heart rate. I have found many applications working on the same. But it was not possible to find one closed or open API supporting it.

Is there any infrastructure that might be useful to her? I was also wondering if the UIAccelerometer class could be useful for one and the same thing, which could be a level of accuracy with the same?

How to implement the same function using: place your finger on the iPhone camera or putting microphones on the jaw or wrist or in some other way?

Is there a way to check changes in blood circulation, find the heart rate using the same or UIAccelerometer? Any API or some kind of code? Thank.

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There is no heart rate available API; these applications do this in various ways. Some will use the accelerometer to measure when the device is shaking with every pulse. Others use the camera’s lens when the flash is on, and then detect when the blood moves on the finger, detecting the light levels that can be seen.

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DSP , , , , ( ).

API- Accelerate DSP. , .

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