Editing a Library

Projects Programming
3 
//extend Keypad class
#include <Keypad.h>

//initialize rows and columns
const byte ROWS = 4; 
const byte COLS = 4; 

//define the symbols on the buttons
char hexaKeys[ROWS][COLS] = {
  {'0','1','2','3'},
  {'4','5','6','7'},
  {'8','9','A','B'},
  {'C','D','E','F'}
};

//row pinouts
byte rowPins[ROWS] = {5, 4, 3, 2}; 
//column pinouts
byte colPins[COLS] = {9, 8, 7, 6};

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

int MIDInotes[16] = {60, 62, 64, 65, 67, 69, 71, 72, 74, 76, 77, 79, 81, 83, 84, 86};

//SOME METHODS:
//MIDI noteON
void noteOn(int channel, int pitch, int velocity) {
  Serial.write(channel);
  Serial.write(pitch);
  Serial.write(velocity);
  delay(1);
}
  
void setup() {
    
  Serial.begin(31250);
  } 
  
void loop() {
  
  char customKey = customKeypad.getKey();
  
  if (customKey){
 
    char testChar = customKey;
    int someInt;
    if (testChar >= 'A' && testChar <= 'F')
    {
      someInt = 10 + (int)(testChar- 'A');
    }
    else
    {
      someInt = (int)(customKey - '0');
    }

  for (int i = 0; i < 16; i++)
  {
    if (i == someInt)
      {
        noteOn(144,MIDInotes[someInt], 127);
      }
      else 
      {
        noteOn(144, MIDInotes[i], 0);
      }  
      delay(1);
    }
  noteOn(144, MIDInotes[someInt], 127); 
  delay(100); 
 }