Arduino Playing MIDI Notes
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Arduino-Powered Instrument Uses Breath to Play MIDI Notes
Xavier Dumont is using an Arduino Micro to drive this MIDI instrument that requires the player to blow to make noise.
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An open-source, breath-controlled MIDI device
The simplest MIDI (Musical Instrument Digital Interface) input devices use good ol' fashioned buttons: push a button and the device sends a MIDI message to trigger a specific note. But that control scheme doesn't replicate the flexibility of a real instrument very well, because a standard button is a binary mechanism.