At Science Hack Day 2015, together with a couple of guys from MADspace I formed a team. We worked on the “Perfect yoga experience”. The idea was to measure the heartbeat and the breathing. By focussing on the breathing the heartrate should get consistent.

And here is an impression of the complete hardware:
SDH2015_CompleteSetup

Here is an animation of the breathing sensor with pictures of the interfacing:
SDH2015_RespiratorySensor150

And some photos of the heartrate components:

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