Arduino 16: Multiplexer

int s0 = 8;
int s1 = 9;
int s2 = 10;
int s3 = 11;
int sig = 0;

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


void setup() {
  // put your setup code here, to run once:
  pinMode(s0,OUTPUT);
  pinMode(s1,OUTPUT);
  pinMode(s2,OUTPUT);
  pinMode(s3,OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  interfaccia(2);
  Serial.read();
  interfaccia(6);
  Serial.read();
}

void interfaccia(int canale) {
  int controllore[] = {s3,s2,s1,s0};
  for(int i=0;i<4;i++)
    digitalWrite(controllore[i],multiplexer[canale][i]);
}