Datasheet

If you open up an application on your mobile device or laptop that support the standard Heart Rate Monitor Service (http://adafru.it/f4I), you should
be able to see the heart rate being updated in sync with the changes seen in the Serial Monitor:
nRF Toolbox HRM Example
The image below is a screenshot from the free nRF Toolbox (http://adafru.it/e9M) application from Nordic on Android (also available on
iOS (http://adafru.it/f4J)), showing the incoming Heart Rate Monitor data:
© Adafruit Industries
https://learn.adafruit.com/introducing-the-adafruit-bluefruit-le-uart-
friend
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