// Pin Definitions
const int selectPins[3] = {2, 3, 4}; // S0~2, S1~3, S2~4
const int zInput = A0; // Connect common (Z) to A0 (analog input)

void setup() {
  Serial.begin(38400); // Initialize the serial port
  // Set up the select pins as outputs:
  for (int i=0; i<3; i++)
  {
    pinMode(selectPins[i], OUTPUT);
    digitalWrite(selectPins[i], HIGH);
  }
  pinMode(zInput, INPUT);
}

void loop()
{
  // Loop through all eight pins.
  for (byte pin=0; pin<=7; pin++){

    for (int i=0; i<3; i++){
      if (pin & (1<<i))
        digitalWrite(selectPins[i], HIGH);
      else
        digitalWrite(selectPins[i], LOW);
    }

    int inputValue = analogRead(A0);
    Serial.print(String(inputValue) + "\t");
  }

  Serial.println();
}