Here is a heart rate monitor that you can use with OpenBCI boards to gain access to live heart-rate data in your projects. The Pulse Sensor is capable of recording heart rate and HRV. It comes with an ear clip, velcro finger strap, and 3 sewing holes.
More gadgets like this: here
You can plug this sensor directly into OpenBCI boards. Costs under $25 at this time.
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