Pulse

Pulse is the app that measures your heart rate with a simple microphone.
It works like a digital stethoscope, in other words Phonocardiogram*.
The heart rate values were validated with some heart rate monitoring. Such as Polar and Zephyr Bluetooth technology.

*Pulse can be used with many very low cost devices developed by "Prof. Phd Emílio Takase". For more information about his work and others software like this, can be found at: http://educacacocerebral.com or http://sapiensludens.org

How to build for education (by Emílio Takase)
http://www.proximus.com.br/news/node/320

The bifurcated path:
Place the microphone in the palm of your hand or inside of a cup and use it like a stethoscope. You will need to be in a quiet room, and to be quiet too.

You can register at https://bioscada.me and monitor your data.

More powerfull vizualizer? You can use Audacity. Audacity® is free, open source, cross-platform software for recording and editing sounds.

NOTE:
Since the mobile device market is very fragmented, this application only works on some devices.

You'll need to install the Adobe® AIR® runtime. sorry about that, but the embedded runtime was crashing on some devices.

NOTE II: IMPORTANTE
if you DO NOT put anything like the sound of your heart not expect good values​​. they will be generated because of the noise. in fact, when you put the sound of your heart the algorithm can hear it!

This software is small open source project, and it is hosted on Cognisense Tecnologia Ltda. If you want to contribute, please feel free to contact us.

See more at:
https://bioscada.me/

and

https://plus.google.com/u/0/communities/104472024247346529827

For old version(adobe air version):
https://bioscada.me/pulse/pages/

The slice tool (for old version of Pulse) was forked from Jeremy Brown github sources.
https://github.com/jeremynealbrown/makemachine/tree/master/actionscript/makemachine/audio

The Manual (pt-br) by Prof. Dr. Emílio Takase
http://www.plugsensor.org/