Button Matrix CD74HC4067 not working

[andreasgaugler]

Hi everybody,

i'm new to arduino and i try to build my own custom midi-controller for ableton live.
i've got a pus2-controller, but for effects and synths, i want to use custom-midi-controller.

Here is a picture:

I try to develope the code step by step, so i got the 4x4 button matrix working, if it's directly connected to 8 digital pins of my leonard.

Here the code:

Blockzitat
#include <Control_Surface.h>

USBMIDI_Interface midi;

// The note numbers corresponding to the buttons in the matrix

const AddressMatrix <4, 4> addresses {{
{36, 37, 38, 39},
{40, 41, 42, 43},
{44, 45, 46, 47},
{48, 49, 50, 51
},
}};

NoteButtonMatrix<4, 4> buttonmatrix {

{0, 1, 2, 3},
{4, 5, 6, 7}, // row pins
// column pins
addresses, // address matrix
CHANNEL_1, // channel and cable number
};

void setup() {
Control_Surface.begin();
}

void loop() {
Control_Surface.loop();
}

now i wanted to get the matrix running over 2 CD74HC4067, but it does nothing

#include <Control_Surface.h>

USBMIDI_Interface midi;

CD74HC4067 mux1 = { 7, {2, 3, 4, 5} };
CD74HC4067 mux2 = { 8, {2, 3, 4, 5} };
// The note numbers corresponding to the buttons in the matrix

const AddressMatrix <4, 4> addresses {{
{36, 37, 38, 39},
{40, 41, 42, 43},
{44, 45, 46, 47},
{48, 49, 50, 51
},
}};

NoteButtonMatrix<4, 4> buttonmatrix {

{mux1.pin(0), mux1.pin(1), mux1.pin(2), mux1.pin(3)}, // row pins
{mux2.pin(0), mux2.pin(1), mux2.pin(2), mux2.pin(3)}, // column pins
addresses, // address matrix
CHANNEL_1, // channel and cable number
};

void setup() {
Control_Surface.begin();

mux1.begin();
mux2.begin();
//for(int i=0; i<15; i++);
// {
// //do I need to assign inputs and outputs?
mux1.pinMode(0, INPUT_PULLUP);
mux2.pinMode(0, INPUT_PULLUP);
// }
};

void loop() {
Control_Surface.loop();
}

i also can't get any action out of the buttons, if use just one multiplexer:

#include <Control_Surface.h>

USBMIDI_Interface midi;

CD74HC4067 mux_1{12, {8, 9, 10, 11} , }; //input, S0-S3, optional enable

// The note numbers corresponding to the buttons in the matrix

const AddressMatrix <4, 4> addresses {{
{36, 37, 38, 39},
{40, 41, 42, 43},
{44, 45, 46, 47},
{48, 49, 50, 51
},
}};

NoteButtonMatrix<4, 4> buttonmatrix {

{mux_1.pin(0), mux_1.pin(1), mux_1.pin(2), mux_1.pin(3)}, // column pins
{2, 3, 4, 5}, // row pins

 addresses,    // address matrix

CHANNEL_1, // channel and cable number
};

void setup()
{
mux_1.begin();

for(int i=0; i<3; i++)
{
//do I need to assign inputs and outputs?
mux_1.pinMode(i, INPUT_PULLUP);
}

Control_Surface.begin(); // Initialize Control Surface
}

void loop() {
Control_Surface.loop();
}

could anybody help me?

[UKHeliBob]

@andreasgaugler

Here the code:

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[PieterP]

The CD74HC4067 class supports input only. The row pins of the button matrix are outputs. Scanning a matrix is simple enough though, you can write a version that supports multiplexers relatively easily, see e.g. https://tttapa.github.io/Control-Surface-doc/Doxygen/d5/d41/ButtonMatrix_8ipp_source.html#l00015.

[andreasgaugler]

Ah okay

So I can use the multiplexer only for Input(cols) and the Outputs have to be connected directly to the board?

Which board would you recommend for a diy-midi-controller?

I ordered a teensy 3.6 and a 4.2 board, because my leonardo seems to be a bit too slow for my project.
In the documentation only the teensy 3.2 is listed, but it's mentioned 4.x would also work?!

Thx for your answer

Andi

[andreasgaugler]

It's me again

Instead of connecting the rows directly to the board, i could use a shift-register, right?

Thx a lot

Andi