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Collin's Lab: Infrared heart sensor

The beating of the heart is often recorded via sound or simply with touch - but there's also another interesting and somewhat lesser known option - light. An infrared emitter/detector pair can be used along with a programmable microcontroller, to effectively visualize the effects of the human body's hardest-working muscle. http://blog.makezine.com/archive/2009/11/collins_lab_infrared_heart_sensor.html
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