Instant Heart Rate monitor for Android and iPhone 4

Note: More info on http://www.instantheartrate.com

Instant heart rate is a heart rate monitor for Android and iPhone smartphones that uses the phones buildin camera to measure your heart rate.

This application measures oxygen saturation changes in your blood. On every heart beat your blood becomes more oxygen rich which causes a slight change in the color of your skin. Camera in your mobile tracks that changes and calculates your heart rate. It works similar way as a medical pulse oximeter but without a dedicated light source.

Press your left index finger gently over the camera. Hold it steady for at least 6 seconds. Your current heart rate will be shown on the display.

If LED flash is not supported it's important that you use this application with good lightning. For best results turn the back of your mobile towards the sun or a lamp. 

This application is an implementation of US patent US4258719 http://www.freepatentsonline.com/4258719.pdf  from 1978. 

It's been made as a part of a study of using sensors build into mobile phones for measuring biological signals.

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