oddson
Well-known member
Here is my code for a simple MIDI controller with both potentiometers and buttons using ResponsiveAnalogRead and BOUNCE libraries to deal with signal stability.
I hope it will be helpful for those looking to implement basic USB-MIDI controller projects and don't want to write their own code as yet.
I'm looking for suggestions and a general vetting for stupidity before pointing noobs at it...
I hope it will be helpful for those looking to implement basic USB-MIDI controller projects and don't want to write their own code as yet.
I'm looking for suggestions and a general vetting for stupidity before pointing noobs at it...
Code:
//************LIBRARIES USED**************
// include the ResponsiveAnalogRead library for analog smoothing
#include <ResponsiveAnalogRead.h>
// include the Bounce library for 'de-bouncing' switches -- removing electrical chatter as contacts settle
#include <Bounce.h>
//usbMIDI.h library is added automatically when code is compiled as a MIDI device
// ******CONSTANT VALUES********
// customize code behaviour here!
const int channel = 1; // MIDI channel
const int A_PINS = 6; // number of Analog PINS
const int D_PINS = 3; // number of Digital PINS
const int ON_VELOCITY = 99; // note-one velocity sent from buttons (should be 65 to 127)
// define the pins you want to use and the CC ID numbers on which to send them..
const int ANALOG_PINS[A_PINS] = {A0,A1,A2,A3,A4,A5};
const int CCID[A_PINS] = {21,22,23,24,25,26};
// define the pins and notes for digital events
const int DIGITAL_PINS[D_PINS] = {0,1,2};
const int note[D_PINS] = {60,61,62};
const int BOUNCE_TIME = 7; // 5 ms is usually sufficient
const boolean toggled = true;
//******VARIABLES***********
// a data array and a lagged copy to tell when MIDI changes are required
byte data[A_PINS];
byte dataLag[A_PINS]; // when lag and new are not the same then update MIDI CC value
//************INITIALIZE LIBRARY OBJECTS**************
// not sure if there is a better way... some way run a setup loop on global array??
// use comment tags to comment out unused portions of array definitions
// initialize the ReponsiveAnalogRead objects
ResponsiveAnalogRead analog[]{
{ANALOG_PINS[0],true},
{ANALOG_PINS[1],true},
{ANALOG_PINS[2],true},
{ANALOG_PINS[3],true},
{ANALOG_PINS[4],true},
{ANALOG_PINS[5],true}/*,
{ANALOG_PINS[6],true},
{ANALOG_PINS[7],true},*/
};
// initialize the bounce objects
Bounce digital[] = {
Bounce(DIGITAL_PINS[0],BOUNCE_TIME),
Bounce(DIGITAL_PINS[1], BOUNCE_TIME),
Bounce(DIGITAL_PINS[2], BOUNCE_TIME)/*,
Bounce(DIGITAL_PINS[3], BOUNCE_TIME),
Bounce(DIGITAL_PINS[4], BOUNCE_TIME),
Bounce(DIGITAL_PINS[5], BOUNCE_TIME),
Bounce(DIGITAL_PINS[6], BOUNCE_TIME),
Bounce(DIGITAL_PINS[7], BOUNCE_TIME),*/
};
//************SETUP**************
void setup() {
// loop to configure input pins and internal pullup resisters for digital section
for (int i=0;i<D_PINS;i++){
pinMode(DIGITAL_PINS[i], INPUT_PULLUP);
}
}
//************LOOP**************
void loop() {
getAnalogData();
getDigitalData();
while (usbMIDI.read()) {
// controllers must call .read() to keep the queue clear even if they are not responding to MIDI
}
}
//************ANALOG SECTION**************
void getAnalogData(){
for (int i=0;i<A_PINS;i++){
// update the ResponsiveAnalogRead object every loop
analog[i].update();
// if the repsonsive value has change, print out 'changed'
if(analog[i].hasChanged()) {
data[i] = analog[i].getValue()>>3;
if (data[i] != dataLag[i]){
dataLag[i] = data[i];
usbMIDI.sendControlChange(CCID[i], data[i], channel);
}
}
}
}
//************DIGITAL SECTION**************
void getDigitalData(){
for (int i=0;i<D_PINS;i++){
digital[i].update();
if (digital[i].fallingEdge()) {
usbMIDI.sendNoteOn(note[i], ON_VELOCITY, channel);
}
// Note Off messages when each button is released
if (digital[i].risingEdge()) {
usbMIDI.sendNoteOff(note[i], 0, channel);
}
}
}
Last edited:
