Current project: Heart-rate defense hoodie.
Here’s a quick photo of the circuit layout for my current project — a hoodie that protects you when your heart rate gets too high. The circuit is taken from embedded-lab.com. I’m using only the first half as I have no need for the 3 Digit CA Display and will be using an Arduino instead of the PIC. I’ll update again when it’s been tested!

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With the op-amp for a nose, the circuit looks a bit upset…
…or maybe just hungry (and going after some sweet resistor/capacitor tastiness).
Damn, I really could have used this a week ago – a pulse of 190 is not fun. Good luck with the project!