A little Googling shows that a number of pulse sensors are available or can be made for all kinds of platforms.
- This one is intended for use with Arduino. Total cost is ~$25, not counting whatever it's attached to.
- For comparison, this one is a more clinical model. I can only imagine how much it costs.
- This setup uses an optical approach instead of a piezoelectric one. It seems like overkill, possibly because the signal requires a lot of amplification.
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.
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