const int ImuxSIG = 7;
const int ImuxS0 = 11;
const int ImuxS1 = 10;
const int ImuxS2 = 9;
const int ImuxS3 = 8;
const int OmuxSIG = 2;
const int OmuxS0 = 6;
const int OmuxS1 = 5;
const int OmuxS2 = 4;
const int OmuxS3 = 3;

int SetMuxChannelI(byte channel) {
  digitalWrite(ImuxS0, bitRead(channel, 0));
  digitalWrite(ImuxS1, bitRead(channel, 1));
  digitalWrite(ImuxS2, bitRead(channel, 2));
  digitalWrite(ImuxS3, bitRead(channel, 3));
}

int SetMuxChannelO(byte channel) {
  digitalWrite(OmuxS0, bitRead(channel, 0));
  digitalWrite(OmuxS1, bitRead(channel, 1));
  digitalWrite(OmuxS2, bitRead(channel, 2));
  digitalWrite(OmuxS3, bitRead(channel, 3));
}

void setup() {
  pinMode(ImuxSIG, OUTPUT);
  pinMode(ImuxS0, OUTPUT);
  pinMode(ImuxS1, OUTPUT);
  pinMode(ImuxS2, OUTPUT);
  pinMode(ImuxS3, OUTPUT);
  pinMode(OmuxS0, OUTPUT);
  pinMode(OmuxS1, OUTPUT);
  pinMode(OmuxS2, OUTPUT);
  pinMode(OmuxS3, OUTPUT);
}

void loop() {
  for (byte i = 0; i < 16; i++) {
    SetMuxChannelI(i);
    digitalWrite(ImuxSIG, HIGH);
    //delay(200);
    digitalWrite(ImuxSIG, LOW);
    //delay(200);
  }

  for (byte i = 0; i < 16; i++) {
    SetMuxChannelO(i);
    byte muxValue = analogRead(OmuxSIG);

    Serial.print(muxValue);
    Serial.print("\t");
  }
}