Measuring Heart Rate With A Piezo

While trying to create a circuit that detects whether water is flowing through a pipe by measuring the vibration with a piezoelectric sensor, just to see what happens I taped the sensor around my finger and - to my surprise - got values that were a very noise-free representation of my heart rate! This is even easier than using LEDs as it only requires a piezoelectric sensor and an Arduino. (and a piece of t ...

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