const int MUX_S0 = 0;   // Multiplexer control pin S0
const int MUX_S1 = 1;   // Multiplexer control pin S1
const int MUX_S2 = 2;   // Multiplexer control pin S2
const int MUX_S3 = 3;   // Multiplexer control pin S3

const int NUM_MUX_CHANNELS = 16; // Number of channels per multiplexer
const int NUM_MULTIPLEXERS = 1;   // Number of multiplexers (changed to 1)

const int LED_PIN = 4; // LED pin (connect to one of the output pins of the multiplexer)

void setup() {
  pinMode(MUX_S0, OUTPUT);
  pinMode(MUX_S1, OUTPUT);
  pinMode(MUX_S2, OUTPUT);
  pinMode(MUX_S3, OUTPUT);
  
  pinMode(LED_PIN, OUTPUT);
  
  Serial.begin(9600);
}

void loop() {
  for (int channel = 0; channel < NUM_MUX_CHANNELS; channel++) {
    // Set the multiplexer control pins
    setMuxControlPins(channel);

    // Turn on the LED
    digitalWrite(LED_PIN, HIGH);

    // Wait for a second
    delay(1000);

    // Turn off the LED
    digitalWrite(LED_PIN, LOW);
    
    // Delay before the next channel
    delay(100); // Delay for better readability, adjust as needed
  }
}

void setMuxControlPins(int channel) {
  digitalWrite(MUX_S0, bitRead(channel, 0));
  digitalWrite(MUX_S1, bitRead(channel, 1));
  digitalWrite(MUX_S2, bitRead(channel, 2));
  digitalWrite(MUX_S3, bitRead(channel, 3));
}