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By dotCore
via ignaciomellado.es
Submitted: Sep 25 2013 / 01:18

There are some apps out there that can read your heart rate with a smartphone camera. No need for external pulsometers. The procedure is simple: you press the smartphone camera lens gently with your finger and, after some seconds, a reading is shown. I was wondering how these apps were doing their magic and did some experiments to get a similar system working.
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