// https://forum.arduino.cc/t/midi-keyboard-using-mega-2560/1118247
// https://wokwi.com/projects/363020868083557377

//#include <MIDI.h>
//MIDI_CREATE_DEFAULT_INSTANCE();


int buttonPin[10] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
int buttonState[10];  // zero automatically at start
int noteNumber[10] = {37, 39, 41, 42, 44, 46, 48, 49, 51, 53};

void setup()
{  
  Serial.begin(500000);
  Serial.println("array variables world.\n");

//  MIDI.begin(); 

  for (int ii = 0; ii < 10; ii++)
  {
    pinMode( buttonPin[ii], INPUT_PULLUP); 
  }  
} 

# define PRESST LOW

void loop()
{
  for (int ii = 0; ii < 10; ii++) 
  {
    if ((digitalRead(buttonPin[ii]) == PRESST) && (buttonState[ii] == 0)) {
//        MIDI.sendNoteOn(noteNumber[ii], 127, 1);

      Serial.print ("on ");
      Serial.println(ii);

      buttonState[ii] = 1;
    }

    if ((digitalRead(buttonPin[ii]) != PRESST) && (buttonState[ii] == 1)) 
    {
//      MIDI.sendNoteOff(noteNumber[ii], 127 ,1); 

      Serial.print ("off ");
      Serial.println(ii);

      buttonState[ii] = 0;
    } 
  }

//  delay(15);
}