https://medium.com/kidstronics/bridging-all-sensors-together-pitbot-ca8803bf9cb

_29_74HC4067_multiplexer_demo_01

/*  Project: LEGO Episode # 29
            Bridging All Sensors Together — Pitbot
            Collecting All Codes for the Final Act of Giving Behaviors to Robot

    INO file: _29_74HC4067_multiplexer_demo_01

    date: 9/01/19

   code by: Public Domain
   Hardware by: YL 70
   software: Arduino IDE 1.8.9

   Description: Exciting power and functionality are available out there in the wild to be
   used to give Pitbot a spirit! This time: Put 16-Channel Multiplexer working!

   Visit: https://medium.com/jungletronics

   Tutorial: https://medium.com/kidstronics/bridging-all-sensors-together-pitbot-ca8803bf9cb

   License: CC-SA 3.0, feel free to use this code however you'd like.
   Please improve upon it! Let me know how you've made it better.
*/
// 74HC4067 demultiplexer demonstration (1 to 16)
// see 74HC4067 data sheet
// connect 74HC4067 S0~S3 to Arduino D0~D3 respectively
// 5V to 74HC4067 pin 1 to power the LEDs 🙂
byte controlPins[] = {B00000000, //0d
                      B00000001, //1d
                      B00000010, //2d,
                      B00000011, //3d
                      B00000100, //4d
                      B00000101, //5d
                      B00000110, //6d
                      B00000111, //7d
                      B00001000, //8d
                      B00001001, //9d
                      B00001010, //10d
                      B00001011, //11d
                      B00001100, //12d
                      B00001101, //13d
                      B00001110, //14d
                      B00001111 //15d
                     };

void setup()
{
  DDRD = B11111111;               // set PORTD (digital 7~0) to outputs
}

void setPin(int outputPin)       // function to select pin on 74HC4067
                          
{
  PORTD = controlPins[outputPin];
}

void loop()
{
  for (int i = 0; i < 16; i++)
  {
    setPin(i);
    delay(250);
  }
}