switch matrix polyphony - Arduino Forum

hey. im stuck.

im trying to make a midi controller with added features of tanspose functions with led interfacing, which all works fine

but im struggling in finding a way of making it so i can read more than 1 switch at a time without getting phantom notes playing?

i have put pull down resistors in with each switch and a diode. what would you say id do?

ive made this code from a mixture of things ive found on the forum
^{int HotPin[6] = {2,3,4,5,6,7}; //Hot (output) pins //
int GndPin[6] = {14,15,16,17,18,19}; //Ground (input) pins //
int OldKeyPress[36] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; //
int NewKeyPress[36] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; //
int KeyNum = 1; //Identifies the key being read //
int MidiNote = 60; //The MIDI note to be played (Middle C is 60)
int midnote = 56; // the midi note automatically transposed to
int val = 0;// to store state of transpose button up
int val1 = 0;// to store state of transpose button down
int state = 0;

void setup()
{
Serial.begin(31250);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, INPUT); //transpose up
pinMode(9, INPUT); //transpose down
pinMode(10, OUTPUT); //leg one of bipolar LED 1
pinMode(11, OUTPUT); // leg two of bipolar LED 1
pinMode(12, OUTPUT); // leg one of bipolar LED 2
pinMode(13, OUTPUT); // leg two of bipolar LED 2
pinMode(14, INPUT);
pinMode(15, INPUT);
pinMode(16, INPUT);
pinMode(17, INPUT);
pinMode(18, INPUT);
pinMode(19, INPUT);

digitalWrite (10, HIGH);
digitalWrite (11, LOW);
delay (100);
digitalWrite (10, LOW);
digitalWrite (11, HIGH);
delay (100);
digitalWrite (10, HIGH);
digitalWrite (11, LOW);
digitalWrite (12, LOW);
digitalWrite (13, HIGH);
delay (100);
digitalWrite (10, LOW);
digitalWrite (11, LOW);
digitalWrite (12, HIGH);
digitalWrite (13, LOW);
delay (100);
digitalWrite (12, LOW);
digitalWrite (13, HIGH);
delay (100);
digitalWrite (12, LOW);
digitalWrite (13, LOW);

}

void loop()

{
for (int h=0; h <= 5; h++)
{
digitalWrite(HotPin[h], HIGH);
{
for (int g=0; g <=5; g++)
{
KeyNum = (g * 6) + h; //Sets KeyNum to a value from 0 to 31 (C1 is 04)
if(analogRead(GndPin[g]) >= 600)
{
NewKeyPress[KeyNum] = 1;
}
else
{
NewKeyPress[KeyNum] = 0;
}
//Find out if the key if pressed
MidiNote = KeyNum + midnote; //Makes C1 on the keyboard middle C
if (NewKeyPress[KeyNum] == 1 && OldKeyPress[KeyNum] == 0) //If key is pressed
{
MidiMessage(0x90, MidiNote, 0x70); //note on, channel 1
}
else if (NewKeyPress[KeyNum] == 0 && OldKeyPress[KeyNum] == 1) //If key is released
{
MidiMessage(0x80, MidiNote, 0x70); //note off, channel 1
}
OldKeyPress[KeyNum] = NewKeyPress[KeyNum]; //Set state for next check
}
}
digitalWrite(HotPin[h], LOW);
}

{

val = digitalRead( ; //reads button value
if (val == HIGH) {
midnote = 1 + midnote;
state = state + 1;
delay (250);}

val1 = digitalRead(9) ; //reads button value
if (val1 == HIGH) {
midnote = midnote - 1;
state = state - 1;
delay (250);
}

if (state == 0) {
digitalWrite(10, LOW);
digitalWrite(11, LOW);
digitalWrite(12, LOW);
digitalWrite(13, LOW);}

if (state == 1) {
digitalWrite(10, HIGH);
digitalWrite(11, LOW);}

if (state == 2) {
digitalWrite(10, LOW);
digitalWrite(11, HIGH);}

if (state == 3) {
digitalWrite(10, HIGH);
digitalWrite(11, LOW);
}

if (state == 4) {
digitalWrite(10, LOW);
digitalWrite(11, HIGH);
}

if (state == 5) {
digitalWrite(10, HIGH);
digitalWrite(11, LOW);
}

if (state == 6) {
digitalWrite(10, LOW);
digitalWrite(11, HIGH);
}

if (state == 7) {
digitalWrite(10, HIGH);
digitalWrite(11, LOW);
}

if (state == {
digitalWrite(10, LOW);
digitalWrite(11, HIGH);
}

if (state == 9) {
digitalWrite(10, HIGH);
digitalWrite(11, LOW);
}

if (state == 10) {
digitalWrite(10, LOW);
digitalWrite(11, HIGH);
}

if (state == 11) {
digitalWrite(10, HIGH);
digitalWrite(11, LOW);
digitalWrite(12, LOW);
digitalWrite(13, LOW);
}

if (state == 12) {
digitalWrite(10, LOW);
digitalWrite(11, HIGH);
digitalWrite(12, LOW);
digitalWrite(13,HIGH);
}

if (state == -1) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);}

if (state == -2) {
digitalWrite(12, LOW);
digitalWrite(13, HIGH);}

if (state == -3) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);
}

if (state == -4) {
digitalWrite(12, LOW);
digitalWrite(13, HIGH);
}

if (state == -5) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);
}
if (state == -6) {
digitalWrite(12, LOW);
digitalWrite(13, HIGH);
}

if (state == -7) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);
}
if (state == -8) {
digitalWrite(12, LOW);
digitalWrite(13, HIGH);
}

if (state == -9) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);
}
if (state == -10) {
digitalWrite(12, LOW);
digitalWrite(13, HIGH);
}

if (state == -11) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);
digitalWrite(10, LOW);
digitalWrite(11, LOW);
}
if (state == -12) {
digitalWrite(12, HIGH);
digitalWrite(13, LOW);
digitalWrite(10, HIGH);
digitalWrite(11, LOW);
}
}
}

//=================================================================================================
void MidiMessage(char cmd, char data1, char data2) //
{ //
Serial.print(cmd, BYTE); //
Serial.print(data1, BYTE); //
Serial.print(data2, BYTE); //
} //
//=================================================================================================}

any help would be much appreciated!

thanks

sam

	Author	Topic: switch matrix polyphony (Read 306 times)
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