595 to drive multiple 4051

Projects General Guidance
7

Dear All.
I really appreciate your response.

  1. I dont use 4051 to 'read'.
  2. I just want more digital output.

I knew that I can stack more 595, but it'll need me to do Shiftout more then once.

I want use this schematic for Digital/Analaog input that will read by Arduino Analog pin.

The 3x 8 output pin of 4051 will threaded as 'Row', and the Arduino Analog pins as 'Column'

This is the basic sketch :

//Pin connected to ST_CP of 74HC595
int latchPin = 8;
//Pin connected to SH_CP of 74HC595
int clockPin = 12;
////Pin connected to DS of 74HC595
int dataPin = 11;
uint8_t rows[]={8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
32,
33,
34,
35,
36,
37,
38,
39};
byte readmode[]={'t', // 't' = digital read, and 
't', // ~ (NOT) the last value
't',
't',
't',
'm', // 'm' = digital read, Send HIGH=NoteOn , LOW=NoteOFF 
'a', // 'a' = Analog read, Send CC
'a',
't',
't',
't',
't',
't',
'm',
'a',
'a',
't',
't',
't',
't',
't',
'm',
'a',
'a'};
uint8_t midchans[]={1,2,3}; //MIDI Channel of Left, Master, Right
uint8_t keyvals[3][2][24] = {};
uint8_t x,y,z =0; //Z=Row, Y=Sub-Group/Chan , X=Group/Chan

int loopcount=0;
long startmils=0;

void setup(){
  Serial.begin(115200);
  pinMode(latchPin, OUTPUT);
  pinMode(14, INPUT);
  pinMode(15, INPUT);
  pinMode(16, INPUT);
  pinMode(17, INPUT);
  pinMode(18, INPUT);
  pinMode(19, INPUT);
  for (x = 0 ; x <3 ; x++){
    for (y = 0 ; y<2; y++) {
      for (z = 0 ; z<24; z++) {
        keyvals[x][y][z]=0;
      }
    }
  }
}
void loop(){
  for (z = 0; z < 24; z++) {
    Serial.print("Z");
    moverow(z);
    for (y=0 ; y<3; y++){
      //pinstart = x*2
      Serial.print("Y");
      for (x=0; x<2; x++ ){
        Serial.print("X");
        //readpin=(x*2)+y
        prockey(x,y,z);
      }
    }
  }
}

void moverow(int thisrow){
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, rows[thisrow]);
    digitalWrite(latchPin, HIGH);
}

void prockey(int proc_x, int proc_y, int proc_z){
  //First we read the analog pin
  int readpin=(proc_x*2)+proc_y ;
  int keyval=0;
  switch (readmode[proc_z]){
    case 't' : //Only Togled every time it's HIGH
      keyval=digitalRead(14+readpin);
      if (keyval) { //button pressed
        keyvals[proc_x][proc_y][proc_z]=~keyvals[proc_x][proc_y][proc_z]; //togle last key val.
        //Here you must send the midi :
        sendNote(proc_x,proc_y,proc_z);
      }
      break;
    case 'm' : // Only togled when current_keyval != last_keyvals
      keyval=digitalRead(14+readpin);
      if (keyval != keyvals[proc_x][proc_y][proc_z]){
        keyvals[proc_x][proc_y][proc_z]=keyval;
        sendNote(proc_x,proc_y,proc_z);
      }
      break;
    case 'a' : //Only Togled when current_keyval != last_keyvals
      keyval=int((analogRead(14+readpin)/1023)*127); //converted to 0-127 for midi compatible
      if (keyval != keyvals[proc_x][proc_y][proc_z]){
        keyvals[proc_x][proc_y][proc_z]=keyval;
        /*Send MidiChange 
          midi channel = midichans[proc_x]
          keynumber = keynum
          value = keyval
        */
      }
      break;
  }
}

void sendNote(int send_x, int send_y, int send_z){
  int keynum=(send_z*(send_y+1))+1; 
  if (keyvals[send_x][send_y][send_z]){
    /*NoteON with :
      midi channel = midichans[send_x]
      keynumber = keynum
      midival = 1
    */
  }
  else {
    /*NoteOff with :
      midi channel = midichans[send_x]
      keynumber = keynum
    */          
  }  
}