Código Fuente:
#include "MIDIUSB.h"
const int N_BUTTONS = 18; // total numbers of buttons
const int BUTTON_ARDUINO_PIN[18] = {2, 3, 4, 5, 6, 7, 14, 15, 18, 19, 20, 21}; // pins of each button connected straight to the Arduino
const int BUTTON_NOTES[18] = {64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75};
int buttonCState[N_BUTTONS] = {}; // stores the button current value
int buttonPState[N_BUTTONS] = {}; // stores the button previous value
// debounce
unsigned long lastDebounceTime[N_BUTTONS] = { 0 }; // the last time the output pin was toggled
unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers
//---------------------MIDI----------------------
byte midiCh = 0; // MIDI channel to be used - start with 1 for MIDI.h lib or 0 for MIDIUSB lib
//---------------------SETUP----------------------
void setup() {
for (int i = 0; i < N_BUTTONS; i++) {
pinMode(BUTTON_ARDUINO_PIN[i], INPUT_PULLUP);
}
}
//---------------------LOOP----------------------
void loop() {
buttons();
}
//---------------------BUTTONS----------------------
void buttons() {
for (int i = 0; i < N_BUTTONS; i++) {
buttonCState[i] = digitalRead(BUTTON_ARDUINO_PIN[i]); // read pins from arduino
if ((millis() - lastDebounceTime[i]) > debounceDelay) {
if (buttonPState[i] != buttonCState[i]) {
lastDebounceTime[i] = millis();
if (buttonCState[i] == LOW) {
controlChange(midiCh, BUTTON_NOTES[i], 127); // channel, note, velocity
MidiUSB.flush();
}
else {
controlChange(midiCh, BUTTON_NOTES[i], 0); // channel, note, velocity
MidiUSB.flush();
}
buttonPState[i] = buttonCState[i];
}
}
}
}
void controlChange(byte channel, byte control, byte value) {
midiEventPacket_t event = { 0x0B, 0xB0 | channel, control, value };
MidiUSB.sendMIDI(event);
}