midiSwitch.ino

#include <Bounce2.h>
#include "MIDIUSB.h"

int numButtons = 8;
int lowButton = 2;
int buttonPin = 3;

Bounce bouncer[8] = {
  Bounce(2, 5),
  Bounce(3, 5),
  Bounce(4, 5),
  Bounce(5, 5),
  Bounce(6, 5),
  Bounce(7, 5),
  Bounce(8, 5),
  Bounce(9, 5),
  Bounce(10, 5)
};

void setup() {
  for (int i = 0; i < numButtons; i ++) {
    pinMode(i+lowButton, INPUT);
    digitalWrite(i+lowButton, HIGH);
  }
}

void loop() {
  for(int i = 0; i < numButtons; i ++) {
    bouncer[i].update();
    if (bouncer[i].fell()) {
      noteOn(0, 60+i, 127);
      MidiUSB.flush();
    }
    else if (bouncer[i].rose()) {
      noteOff(0, 60+i, 127);
      MidiUSB.flush();
    }
  }
}

void noteOn(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOn = {0x09, 0x90 | channel, pitch, velocity};
  MidiUSB.sendMIDI(noteOn);
}

void noteOff(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOff = {0x08, 0x80 | channel, pitch, velocity};
  MidiUSB.sendMIDI(noteOff);
}