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Smartwatches use a flashing green light to measure your heart rate and a red and infrared light to measure your oxygen saturation. The way it works is really clever.

Watch Andrew Steele's video here: https://www.youtube.com/watch?vfDj2kYIF-sE

Check out the python code he used to analyze my face: https://github.com/ajsteele/faceHR

Watch my motion amplification video here: https://www.youtube.com/watch?vrEoc0YoALt0

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Brendan Williams
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Mast
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