I want to measure my pulse rate, and turn a light on for a moment for each heartbeat. I’ve seen a few ways to do it. Ideally I’d like it to be wearable and measure the pulse from a sensor attached to or against the chest.
This one: http://pulsesensor.myshopify.com/products/pulse-sensor-amped
seems to be the simplest. But also quite expensive.
A much more complex one: http://www.instructables.com/id/Electrocardiograph-Heart-Rate-Monitor/
I don’t have much electronics experience, so I’d like something that I could learn from, but not overwhelmingly complex.