Heh. http://youtu.be/guZ9PStlZfk This is an array of red LEDs in the shape of a heart blinking in time to my very own heart, courtesy of a pulse sensor, an Arduino Uno, and a 9V battery. Exact sources for everything are in the caption to the video.
I had this working from a wall-wart way back in January, but for some reason it wouldn't play with a 9V battery. Plugged it up this evening and found that whatever gremlin had been inhabiting the thing had left. -- CHS
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