How do I wire my CD74HC4067 multiplexer for my 61-note matrixed MIDI keyboard?

Other Hardware General Electronics
8

I'll check it out, though I would love to use the set of CD74HC4067 multiplexers that I have for a few different reasons. I will ultimately have three 61-key keyboards and additional switches to be controlled by my Arduino and was wondering if this code might do the trick. I wasn't sure if I needed to declare the pinMode for each multiplexer or if the ControlSurface package does that for me when instantiating a NoteButtonMatrix.

#include <Control_Surface.h> // Include the Control Surface library
#include <AH/Hardware/ExtendedInputOutput/AnalogMultiplex.hpp>

HairlessMIDI_Interface midi;

using namespace MIDI_Notes;

// Instantiate a multiplexer
CD74HC4067 mux_1{2, {5, 6, 7, 8} , }; //input, S0-S3, optional enable
CD74HC4067 mux_2{3, {5, 6, 7, 8} , }; //input, S0-S3, optional enable

const AddressMatrix<8, 8> addresses
  {{
    {36, 37, 38, 39, 40, 41, 42, 43},
    {44, 45, 46, 47, 48, 49, 50, 51},
    {52, 53, 54, 55, 56, 57, 58, 59},
    {60, 61, 62, 63, 64, 65, 66, 67},
    {68, 69, 70, 71, 72, 73, 74, 75},
    {76, 77, 78, 79, 80, 81, 82, 83},
    {84, 85, 86, 87, 88, 89, 90, 91},
    {92, 93, 94, 95, 96, 97, 98, 99},
  }};

NoteButtonMatrix<8, 8> matrix_I
  {
    {
      // ROW PINS // INPUT // HORIZONTAL
      mux_1.pin(0), mux_1.pin(1), mux_1.pin(2), mux_1.pin(3), mux_1.pin(4), mux_1.pin(5), mux_1.pin(6), mux_1.pin(7),
    },
    {
      // COLUMN PINS // OUTPUT // VERTICAL
      mux_2.pin(0), mux_2.pin(1), mux_2.pin(2), mux_2.pin(3), mux_2.pin(4), mux_2.pin(5), mux_2.pin(6), mux_2.pin(7),
    },
    addresses, // address matrix
    CHANNEL_1,    // channel and cable number
  };


void setup()
{
  mux_1.begin();
  mux_2.begin();
  
  for(int i=0; i<8; i++)
  {
    //do I need to assign inputs and outputs?
    mux_1.pinMode(i, OUTPUT);
    mux_2.pinMode(i, INPUT_PULLUP);
  }
  
  Control_Surface.begin(); // Initialize Control Surface
}
 
void loop()
{
  Control_Surface.loop(); // Update the Control Surface
}

//Thanks to PieterP's example code

Thanks!!