The OLPC Goldenstate grassroots group has developed an alternative heart rate monitor to add to the ECG Prototype. A simple Plethysmograph circuit was implemented leveraging the built-in ADC and a modified version of Arjun's Measure code. A Plethysmograph is an infrared photoelectric sensor used to record changes in pulsatile blood flow from the finger. The Plethysmograph operates by recording changes in blood volume as the arterial pulse expands and contracts the microvasculature. A simple beat detection method was implemented to capture heart rate.
Video link: http://www.youtube.com/watch?v=PQamD9apQS0 Original ECG Prototype link: http://www.youtube.com/watch?v=k1QKTKAAug4 Tom Boonsiri http://olpcgoldenstate.blogspot.com
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