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Get well soon

J. Harry Caufield

Here is a use for one of the strange but inevitable results of modern society: singing greeting cards. The materials in one of those cards, plus a cheap resistor and capacitor, are enough to assemble a perfectly usable pulse sensor. The original paper suggests that this off-the-shelf solution could be used in an educational setting. 

A little Googling shows that a number of pulse sensors are available or can be made for all kinds of platforms.
I'm imagining an art project in which a viewer's heart rate changes the intensity of lights in a room or turns certain appliances (i.e., a fan or a radio) on or off at certain rate thresholds. Even something like a cheap knock-off of this bike helmet seems entirely feasible.