An interesting app turns your iphone into a surprisingly accurate heart rate monitor. Instant Heart Rate can be downloaded in a free version with advertisements or a paid version without adds and with more features.
Basically you start up the app and place your index finger directly against the iPhone camera.
I have tried it on my iPhone 3GS and iPhone 4. The LED flash in the iPhone 4 gives you a faster and more accurate heart rate.
I assume the app must pick up the pulsations in my finger in terms of slight colour changes as the blood flows through. Pretty cool idea that actually works.
Basically you start up the app and place your index finger directly against the iPhone camera.
I have tried it on my iPhone 3GS and iPhone 4. The LED flash in the iPhone 4 gives you a faster and more accurate heart rate.
I assume the app must pick up the pulsations in my finger in terms of slight colour changes as the blood flows through. Pretty cool idea that actually works.