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.
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!
Please feel free to contact us.
See more at:
https://bioscada.com.br/
The Manual (pt-br) by Prof. Dr. Emílio Takase
http://www.plugsensor.org/