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LEAP#376 Piezo Vibration Detector and BPM Counter

I’m experimenting with some piezo transducers (sensors) to capture physical taps as a beats per minute measure with a microprocessor. All the filtering and debouncing of the raw piezo signal is done onboard the ATmega328 using a combination of:

  • analog comparator interrupts
  • filtering based on musical assumptions
  • exponential averaging

The result is a BPM between the threshold of the perceptual present and too fast to be useful.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image