I am not new to Arduino, however, I am new to button matrix when it comes to integration with midi, I have not found any examples of this, I have tried 10 different ways so I can not post all codes, but to give you an idea, i get the matrix working just fine:
const int numRows = 5;
const int numCols = 5;
int rowPins[numRows] = {2, 3, 4, 5, 6};
int colPins[numCols] = {7, 8, 9, 10, 16};
bool buttonState[numRows][numCols];
void setup() {
for (int i = 0; i < numRows; i++) {
pinMode(rowPins[i], INPUT_PULLUP);
}
for (int i = 0; i < numCols; i++) {
pinMode(colPins[i], OUTPUT);
digitalWrite(colPins[i], HIGH);
}
Serial.begin(9600);
}
void loop() {
// Scan the matrix
for (int col = 0; col < numCols; col++) {
digitalWrite(colPins[col], LOW);
for (int row = 0; row < numRows; row++) {
bool currentState = digitalRead(rowPins[row]) == LOW;
if (currentState != buttonState[row][col]) {
buttonState[row][col] = currentState;
if (currentState) {
Serial.print("Button Pressed: Row = ");
Serial.print(row + 1);
Serial.print(", Column = ");
Serial.println(col + 1);
}
}
}
digitalWrite(colPins[col], HIGH);
}
}
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- And this is the midi code, i am using, and it works just fine:
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#include <MIDIUSB.h>
#include "PitchToNote.h"
#define NUM_BUTTONS 14
const uint8_t button1 = 2;
const uint8_t button2 = 3;
const uint8_t button3 = 4;
const uint8_t button4 = 5;
const uint8_t button5 = 6;
const uint8_t button6 = 7;
const uint8_t button7 = 8;
const uint8_t button8 = 9;
const uint8_t button9 = 20;
const uint8_t button10 = 19;
const uint8_t button11 = 15;
const uint8_t button12 = 14;
const uint8_t button13 = 16;
const uint8_t button14 = 10;
const int intensityPot = 3; //A3 - input not used right now
const uint8_t buttons[NUM_BUTTONS] = { button1, button2, button3, button4, button5, button6, button7, button8, button9, button10, button11, button12, button13, button14 };
const byte notePitches[NUM_BUTTONS] = { pitchB7, pitchB7b, pitchA7, pitchA7b, pitchG7, pitchG7b, pitchF7, pitchE7, pitchE7b, pitchD7, pitchD7b, pitchC7, pitchB6, pitchB6b };
uint8_t notesTime[NUM_BUTTONS];
uint8_t pressedButtons = 0x00;
uint8_t previousButtons = 0x00;
uint8_t intensity;
void setup() {
for (int i = 0; i < NUM_BUTTONS; i++)
pinMode(buttons[i], INPUT_PULLUP);
}
void loop() {
readButtons();
readIntensity();
playNotes();
}
void controlChange(byte channel, byte control, byte value) {
midiEventPacket_t event = { 0x0B, 0xB0 | channel, control, value };
MidiUSB.sendMIDI(event);
}
void readButtons() {
for (int i = 0; i < NUM_BUTTONS; i++)
{
if (digitalRead(buttons[i]) == LOW)
{
bitWrite(pressedButtons, i, 1);
delay(50);
}
else
bitWrite(pressedButtons, i, 0);
}
}
void readIntensity() {
int val = analogRead(intensityPot);
intensity = (uint8_t)(map(val, 0, 1023, 0, 127));
}
void playNotes() {
for (int i = 0; i < NUM_BUTTONS; i++)
{
if (bitRead(pressedButtons, i) != bitRead(previousButtons, i))
{
if (bitRead(pressedButtons, i))
{
bitWrite(previousButtons, i, 1);
noteOn(0, notePitches[i], intensity);
MidiUSB.flush();
}
else
{
bitWrite(previousButtons, i, 0);
noteOff(0, notePitches[i], 0);
MidiUSB.flush();
}
}
}
}
void noteOn(byte channel, byte pitch, byte velocity) {
midiEventPacket_t noteOn = { 0x09, 0x90 | channel, pitch, velocity };
MidiUSB.sendMIDI(noteOn);
}
void noteOff(byte channel, byte pitch, byte velocity) {
midiEventPacket_t noteOff = { 0x08, 0x80 | channel, pitch, velocity };
MidiUSB.sendMIDI(noteOff);
}
how are people using button matrix to send midi messages? sometimes I can get the top row working, then I change the code mainly the part under 'void playNotes' changing the order of '<NUM_ROWS * NUM_COLS;...' and many other changes, but never could i get all rows sending data to the end device. can someone direct me to an example of this type of intergrations? or explain how it should work with code examples. Thanks
