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There are 25 LEDs in a 5x5 matrix (5 rows, 5 columns) connected to a 25 key MIDI

ID: 3801543 • Letter: T

Question

There are 25 LEDs in a 5x5 matrix (5 rows, 5 columns) connected to a 25 key MIDI controller by way of an Arduino Mega 2560 with a MIDI shield; each led corresponds to one key of the MIDI controller. Below is the code that lights up each LED when a note on the MIDI controller is pressed. When two notes are pressed at the same time notes D3-(colpin3, rowpin1) & F3-(colpin1, rowpin2) light up as well as the LEDs for C3-(colpin1, rowpin1) & G3-(colpin3, rowpin2) even though those notes are not being pressed. When x number of notes are pressed the same number of LEDs should light up. In C++ edit the code so that when two or more notes are pressed at the same time on the MIDI controller, only the LEDs for the notes being pressed light up.

#include
MIDI_CREATE_DEFAULT_INSTANCE();

int colpin1=31;
int colpin2=33;
int colpin3=35;
int colpin4=37;
int colpin5=39;
int rowpin1=30;
int rowpin2=32;
int rowpin3=34;
int rowpin4=36;
int rowpin5=38;
byte data1 = 0;
byte data2 = 0;

void setup() {
MIDI.begin(MIDI_CHANNEL_OMNI);
MIDI.setHandleNoteOn(MyHandleNoteOn);
MIDI.setHandleNoteOff(MyHandleNoteOff);
pinMode(colpin1,OUTPUT);
pinMode(colpin2,OUTPUT);
pinMode(colpin3,OUTPUT);
pinMode(colpin4,OUTPUT);
pinMode(colpin5,OUTPUT);
pinMode(rowpin1,OUTPUT);
pinMode(rowpin2,OUTPUT);
pinMode(rowpin3,OUTPUT);
pinMode(rowpin4,OUTPUT);
pinMode(rowpin5,OUTPUT);
digitalWrite(colpin1,HIGH);
digitalWrite(colpin2,HIGH);
digitalWrite(colpin3,HIGH);
digitalWrite(colpin4,HIGH);
digitalWrite(colpin5,HIGH);
digitalWrite (rowpin1,LOW);
digitalWrite (rowpin2,LOW);
digitalWrite (rowpin3,LOW);
digitalWrite (rowpin4,LOW);
digitalWrite (rowpin5,LOW);
}

void loop() {
MIDI.read();
}
void MyHandleNoteOn(byte channel, byte pitch, byte velocity) {
data1 = MIDI.getData1();

if (data1==48){//C3
digitalWrite(colpin1,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==49){//C3#

digitalWrite(colpin2,LOW);
digitalWrite(rowpin1,HIGH);

}
if (data1==50){//D3
digitalWrite(colpin3,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==51){//D3#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==52){//E3

digitalWrite(colpin5,LOW);
digitalWrite(rowpin1,HIGH);

}
if (data1==53){//F3
digitalWrite(colpin1,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==54){//F3#
digitalWrite(colpin2,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==55){//G3
digitalWrite(colpin3,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==56){//G3#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==57){//A3
digitalWrite(colpin5,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==58){//A3#
digitalWrite(colpin1,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==59){//B3
digitalWrite(colpin2,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==60){//C4
digitalWrite(colpin3,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==61){//C4#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==62){//D4
digitalWrite(colpin5,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==63){//D4#
digitalWrite(colpin1,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==64){//E4
digitalWrite(colpin2,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==65){//F4
digitalWrite(colpin3,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==66){//F4#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==67){//G4
digitalWrite(colpin5,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==68){//G4#
digitalWrite(colpin1,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==69){//A4
digitalWrite(colpin2,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==70){//A4#
digitalWrite(colpin3,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==71){//B4
digitalWrite(colpin4,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==72){//C5
digitalWrite(colpin5,LOW);
digitalWrite(rowpin5,HIGH);
}

}

Explanation / Answer

#include
MIDI_CREATE_DEFAULT_INSTANCE();

int colpin1=31;
int colpin2=33;
int colpin3=35;
int colpin4=37;
int colpin5=39;
int rowpin1=30;
int rowpin2=32;
int rowpin3=34;
int rowpin4=36;
int rowpin5=38;
byte data1 = 0;
byte data2 = 0;

void setup() {
MIDI.begin(MIDI_CHANNEL_OMNI);
MIDI.setHandleNoteOn(MyHandleNoteOn);
MIDI.setHandleNoteOff(MyHandleNoteOff);
pinMode(colpin1,OUTPUT);
pinMode(colpin2,OUTPUT);
pinMode(colpin3,OUTPUT);
pinMode(colpin4,OUTPUT);
pinMode(colpin5,OUTPUT);
pinMode(rowpin1,OUTPUT);
pinMode(rowpin2,OUTPUT);
pinMode(rowpin3,OUTPUT);
pinMode(rowpin4,OUTPUT);
pinMode(rowpin5,OUTPUT);
digitalWrite(colpin1,HIGH);
digitalWrite(colpin2,HIGH);
digitalWrite(colpin3,HIGH);
digitalWrite(colpin4,HIGH);
digitalWrite(colpin5,HIGH);
digitalWrite (rowpin1,LOW);
digitalWrite (rowpin2,LOW);
digitalWrite (rowpin3,LOW);
digitalWrite (rowpin4,LOW);
digitalWrite (rowpin5,LOW);
}

void loop() {
MIDI.read();
}
void MyHandleNoteOn(byte channel, byte pitch, byte velocity) {
data1 = MIDI.getData1();

if (data1==48){//C3
digitalWrite(colpin1,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==49){//C3#

digitalWrite(colpin2,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==50){//D3
digitalWrite(colpin3,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==51){//D3#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin1,HIGH);
}
if (data1==52){//E3

digitalWrite(colpin5,LOW);
digitalWrite(rowpin1,HIGH);

}
if (data1==53){//F3
digitalWrite(colpin1,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==54){//F3#
digitalWrite(colpin2,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==55){//G3
digitalWrite(colpin3,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==56){//G3#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==57){//A3
digitalWrite(colpin5,LOW);
digitalWrite(rowpin2,HIGH);
}
if (data1==58){//A3#
digitalWrite(colpin1,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==59){//B3
digitalWrite(colpin2,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==60){//C4
digitalWrite(colpin3,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==61){//C4#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==62){//D4
digitalWrite(colpin5,LOW);
digitalWrite(rowpin3,HIGH);
}
if (data1==63){//D4#
digitalWrite(colpin1,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==64){//E4
digitalWrite(colpin2,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==65){//F4
digitalWrite(colpin3,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==66){//F4#
digitalWrite(colpin4,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==67){//G4
digitalWrite(colpin5,LOW);
digitalWrite(rowpin4,HIGH);
}
if (data1==68){//G4#
digitalWrite(colpin1,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==69){//A4
digitalWrite(colpin2,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==70){//A4#
digitalWrite(colpin3,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==71){ //B4
digitalWrite(colpin4,LOW);
digitalWrite(rowpin5,HIGH);
}
if (data1==72){ //C5
digitalWrite(colpin5,LOW);
digitalWrite(rowpin5,HIGH);
}

}

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