I’m trying to wrap my head around using binary addresses in a mux. Failing miserably. For the circuit I have six 16 channel analog multiplexers CD74HC4067 as slaves to an eight channel multiplexor CD54HC4051 master. They are bringing in 96 sensor readings (IR receiver diodes through Op Amps) into an array that, in turn, is used to constantly update lotsa LEDs through a series of shift registers (TLC5940) using the Arduino TLC5940 Library.

I’ve included the possible wiring scheme that the code is trying to control. It probably needs work too.

Question: I’ve seen, and SEMI-understand matrixes that address 32 inputs (4 x 8 bits) but not quite understanding how I can address the six mux chips with 96 inputs. Or if I can even do it this way. Example from this forum: How to code for cascading multiplexers? Is it possible with this matrix of 96 inputs, and how? Am I barking up the wrong tree?

Code so far:

    #include <Tlc5940.h> //Arduino TLC5940 Library controls the individual LEDs - "Pixels"

int ledCount = 96; //change  LED "PIXEL" count in matrix...also number of IR sensor inputs

int thresh = 10; //value for usable distance reading from IR

// main structures to hold LED Pixel array on/off state, IR reciever readings
byte dsply_state[ledCount];    //pixel on-off grid, need for tlc5940    
uint_16  recv_state[ledCount];           // IR Readings - FROM mux set-up  


// Master IR -mux sensor pins for Arduino Pro MINI
#define  M_S0 2
#define  M_S1 4
#define  M_S2 5
// Slave IR mux sensor pins
#define  S_S0 6
#define  S_S1 7
#define  S_S2 8
#define  S_S3 12


//  ANALOG PIN :
#define  InputFromMux A0

void setup() {
    //Serial.begin(9600);
    
    //tlc5940 Arduino library
    Tlc.init(0);
    
    // CONFIGURE ADDRESS PINS
    pinMode(M_S0, OUTPUT);
    pinMode(M_S1, OUTPUT);
    pinMode(M_S2, OUTPUT);

    pinMode(S_S0, OUTPUT);
    pinMode(S_S1, OUTPUT);
    pinMode(S_S2, OUTPUT);
    pinMode(S_S3, OUTPUT);
    pinMode(InputFromMux, INPUT); 

}


void loop() {
    // LOOP THROUGH ALL THE ADDRESSES OF THE MASTER and SLAVES.  
    
  for (int i = 0; i < ledCount; i++) {
  
    digitalWrite(M_S2, i & 0b1000000);
    digitalWrite(M_S1, i & 0b0100000);    
    digitalWrite(M_S0, i & 0b0010000);
    digitalWrite(S_S3, i & 0b0001000);       
    digitalWrite(S_S2, i & 0b0000100);
    digitalWrite(S_S1, i & 0b0000010);
    digitalWrite(S_S0, i & 0b0000001);
    
    delay(2);

    //edited as per @Gerben. thanks so much

    //get an individual sensor reading from IR receiver/opAmp mux, store it in a variable 
     int IRstate = analogRead(InputFromMux);

    //populate receiving array with a reading
     recv_state[i] = IRstate;
    
    //populate display array for tlc5940 to push out
     dsply_state[i] = recv_state[i];

} //end for(i...) loop
    
      //run through display state array to check if the stored reading is greater than a threshold number
      //if yes, then turn on the "pixel". If not, set it to zero
      //
      
       for (int x = 0; x < ledCount; x++)
          if (dsply_state[x] >= thresh ) {  
  
               Tlc.set(dsply_state[x], 4000);

             //or if reading from mux is zero  
          } else if (dsply_state[x] < thresh) {
            
              Tlc.set(dsply_state[x], 0);
              }
              
            //tlc5940 Arduino library - update clocks the chips
            // move update(); outside the for(x...) loop for speed?
        Tlc.update();
        delay(10);
      
      } //end For(x..) Loop

}//endMainLoop