I hope I can get some help on how to get this to work.

I have multiple Sensors (32 of these) which values I want to read. I am using a master multiplexer HC4051 connected to 4 slave multiplexers, this is my wiring: [here][1]

I tested it using one single multiplexer and it works as intended, but when adding the slave I cannot getting it to work, I am not sure how to code for it.

When using this code:

// 74XX4051 ADDRESS PINS :
#define  M_S0 2
#define  M_S1 3
#define  M_S2 4

#define  S_S0 7
#define  S_S1 6
#define  S_S2 5

// 74XX4051 ANALOG PIN :
#define  Z 0

void setup() {
    // 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);

    // CONFIGURE SERIAL
    Serial.begin(57600);
}

void loop() {
    int value;

    // LOOP THROUGH ALL THE ADDRESSES OF THE MASTER 
    for ( byte count = 0; count < 4 ; count++ ) {
         // SET THE ADDRESS
         digitalWrite(M_S0, bitRead(count, 0) );   
         digitalWrite(M_S1, bitRead(count, 1) );
         digitalWrite(M_S2, bitRead(count, 2) );
                
         // LOOP THROUGH ALL THE ADDRESSES OF THE SLAVES
         for ( byte count_1 = 0; count_1 < 32 ; count_1++ ) {
             digitalWrite(S_S0, bitRead(count_1, 0) );
             digitalWrite(S_S1, bitRead(count_1, 1) );
             digitalWrite(S_S2, bitRead(count_1, 2) );

             // READ THE ANALOG VALUE
             value = (bitRead(count_1, 2), bitRead(count_1, 1), bitRead(count_1, 0));
         }

         // READ THE ANALOG FOR THE MASTER ADRESSE
         value = analogRead(Z);

         // SERIAL OUTPUT
         // print : ### value
         Serial.print(bitRead(count, 2));
         Serial.print(bitRead(count, 1));
         Serial.print(bitRead(count, 0));
         Serial.print(' ');
         Serial.println(value);

         delay(100);
     }
}

I am only getting random readings really (the reading LED for the moisture sensor does not switch on when the reading is done).

What I am doing wrong? Any help is appreciated.

UPDATE:

i updated my code as follows :

// Master moisture sensor pins
#define  M_S0 7
#define  M_S1 8
#define  M_S2 9
// Slave moisture sensor pins
#define  S_S0 4
#define  S_S1 5
#define  S_S2 6
int sensorVCC = 13;
//  ANALOG PIN :
#define  Z 0

int sensorValue = 0;  // variable to store the value coming from the sensor


void setup() {
    Serial.begin(9600);
    // 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(sensorVCC, OUTPUT); 
    
    digitalWrite(sensorVCC, LOW);
}

void loop() {

    // LOOP THROUGH ALL THE ADDRESSES OF THE MASTER 
    for (int i = 0; i < 32; i++) {
    digitalWrite(sensorVCC, HIGH);
    delay(100); //make sure the sensor is powere
    
    digitalWrite(S_S2, i & 0b000100);
    digitalWrite(S_S1, i & 0b000010);
    digitalWrite(S_S0, i & 0b000001);
    digitalWrite(M_S2, i & 0b100000);
    digitalWrite(M_S1, i & 0b010000);
    digitalWrite(M_S0, i & 0b001000);


    delay(1);
    

    int humidityRaw = analogRead(Z); // 1023 to 0 ===> 0 to 100%
    int humidityReal = map(humidityRaw, 975, 523, 0, 100);
    digitalWrite(sensorVCC, LOW);  
  
    Serial.print("Input ");
    Serial.print(i);
    Serial.print(": ");
    Serial.print(humidityReal);
    Serial.println(" % ");
    delay(1000); 
}
}

and this is my output :

Input 0: 0 % 
Input 1: 0 % 
Input 2: 0 % 
Input 3: 0 % 
Input 4: 0 % 
Input 5: 0 % 
Input 6: 0 % 
Input 7: 0 % 
Input 8: 0 % 
Input 9: 0 % 
Input 10: 0 % 
Input 11: 0 % 
Input 12: 0 % 
Input 13: 0 % 
Input 14: 0 % 
Input 15: 0 % 
Input 16: 0 % 
Input 17: 0 % 
Input 18: 0 % 
Input 19: 0 % 
Input 20: 0 % 
Input 21: 0 % 
Input 22: 0 % 
Input 23: 0 % 
Input 24: 0 % 
Input 25: 0 % 
Input 26: 0 % 
Input 27: 0 % 
Input 28: 100 % 
Input 29: 100 % 
Input 30: 100 % 
Input 31: 100 % 

only channel 0 + 10 + 20 + 32 are hooked !! .... it seems that it only reads 4 outputs of the Master MUX and it shows the same value for all the 4 inputs. what is wrong ?