#define analogPin0 A0
#define analogPin1 A1
const uint8_t controlPins[] = { 2, 3, 4, 5 };
const uint8_t controlPins1[] = { 6, 7, 8, 9 };
int threshold = 1;
float valueold[16]; 
float valueold1[16];//Integerarray
float readMux(int channel)
{
  for(int i = 0; i < 4; i ++)
  {
    digitalWrite(controlPins[i], channel >> i & 1);
  }
  delay(10);
  return analogRead(analogPin0);
  
}
float readMux1(int channel1)
{
  for(int i = 0; i < 4; i ++)
  {
    digitalWrite(controlPins1[i], channel1 >> i & 1);
  }
  delay(5);

  return analogRead(analogPin1);
  
}

void setup()
{
  Serial.begin(9600);
  for (int i = 0; i < 4; ++i)
  {
    pinMode(controlPins[i], OUTPUT);
  }
}

void loop(){
  
for (int i = 0; i < 16; i++) {
  
  int current_value = readMux(i); //read
  
  
  int difference = abs(current_value - valueold[i]);

  // Detect changes both upwards and downwards
  if (difference >= threshold) {
    valueold[i] = current_value; // Update reference value
    Serial.print("MUX1 Channel ");
    Serial.print(i);
    Serial.print(": ");
    Serial.println(current_value);
    //Serial.print("Change: ");
    //Serial.println(difference);
} 
    int current_value1 = readMux1(i);
    int difference1 = abs(current_value1 - valueold1[i]);
  
  if (difference1 >= threshold) {

    valueold1[i] = current_value1;
    Serial.print("MUX2 Channel ");
    Serial.print(i);
    Serial.print(": ");
    Serial.println(current_value1);
  
  }
 }   
}