//Mux control pins
int s0 = 2;
int s1 = 3;
int s2 = 4;
int s3 = 5;
int controlChange = 176; // Control-Change auf MIDI Kanal 1

int potiWert[16];
int controllerWert[16];
int controllerWertAlt[16];
int potiPrint = 0;
int i = 0;

// faders
int fader0 = 0;
int fader0old = 0;
int fader1 = 0;
int fader1old = 0;
int fader2 = 0;
int fader2old = 0;
int fader3 = 0;
int fader3old = 0;
int fader4 = 0;
int fader4old = 0;
int fader5 = 0;
int fader5old = 0;

bool test = false;
bool test2 = false;
//Mux in "SIG" pin
int SIG_pin = 0;

int threshold = 0; // Schwellenwert für die Änderungsdetektion


void setup(){
  pinMode(s0, OUTPUT); 
  pinMode(s1, OUTPUT); 
  pinMode(s2, OUTPUT); 
  pinMode(s3, OUTPUT); 

  digitalWrite(s0, LOW);
  digitalWrite(s1, LOW);
  digitalWrite(s2, LOW);
  digitalWrite(s3, LOW);

  Serial.begin(9600);
  
}


void loop() {
  // ... other code ...
  
 
  for (int i = 0; i < 16; i++) {

   
    switch (i) {
      case 0:
      
        int currentFaderValue = readMux(i);
        if (abs(currentFaderValue - fader0old) > threshold) {
          
          fader0old = currentFaderValue;
         Serial.print(i);
          //Serial.println("CASE0");
          // ... handle fader1 change ...
        }
        
      case 1:
      //Serial.print(i);
      //Serial.println(currentFaderValue);
      //Serial.println(fader1old);
      
        currentFaderValue = readMux(i);
        if (abs(currentFaderValue - fader1old) > threshold) {
          
          fader1old = currentFaderValue;
          Serial.print(i);
          //Serial.println("CASE1");
          // ... handle fader2 change ...
        }
        
      // ... add similar cases for other faders ...
      case 2:
        currentFaderValue = readMux(i);
        if (abs(currentFaderValue - fader2old) > threshold) {
          
          fader2old = currentFaderValue;
          //Serial.println("CASE2");
          // ... handle fader3 change ...
        }
        break;
      // ... add similar cases for other faders ...
    }
  }
  
}





int readMux(int channel){
  int controlPin[] = {s0, s1, s2, s3};

  int muxChannel[16][4]={
    {0,0,0,0}, //channel 0;
    {1,0,0,0}, //channel 1;
    {0,1,0,0}, //channel 2;
    {1,1,0,0}, //channel 3
    {0,0,1,0}, //channel 4
    {1,0,1,0}, //channel 5
    {0,1,1,0}, //channel 6
    {1,1,1,0}, //channel 7
    {0,0,0,1}, //channel 8
    {1,0,0,1}, //channel 9
    {0,1,0,1}, //channel 10
    {1,1,0,1}, //channel 11
    {0,0,1,1}, //channel 12
    {1,0,1,1}, //channel 13
    {0,1,1,1}, //channel 14
    {1,1,1,1}  //channel 15
  };

  //loop through the 4 sig
  for(int i = 0; i < 4; i ++){
    digitalWrite(controlPin[i], muxChannel[channel][i]);
  
  }


  //read the value at the SIG pin
  int val = analogRead(0);
Serial.print(val, HEX);
  //return the value
  //return val;
}