Introduction

In this post, we will explore a basic setup using an Arduino to control a 16/32 multiplexer. The primary goal is to understand how Arduino can efficiently manage and scan through the channels of the multiplexer.

Hardware

For this test, you will need the following components:

  • Arduino Uno board
  • 16/32 multiplexer (Datasheet: Multiplexer Datasheet)
  • 12V power supply for the multiplexer

Wiring

Connect the Arduino to the multiplexer following this wiring scheme:

  • Arduino Pin 2 to Multiplexer 1H
  • Arduino Pin 3 to Multiplexer 1L
  • Arduino Pin 4 to Multiplexer 2H
  • Arduino Pin 5 to Multiplexer 2L
  • Arduino Pin 10 to Multiplexer CLK
  • Arduino Pin 11 to Multiplexer RES
  • Arduino GND to Multiplexer GND

Code Explanation

The provided Arduino code initializes the pins, sets up the multiplexer, and then scans through the channels. Here’s a program:

void setup() {

  Serial.begin(9600);



  // Set pins as OUTPUT

  pinMode(2, OUTPUT);

  pinMode(3, OUTPUT);

  pinMode(4, OUTPUT);

  pinMode(5, OUTPUT);

  pinMode(10, OUTPUT);

  pinMode(11, OUTPUT);



  // Initialize the multiplexer

  digitalWrite(2, HIGH);

  digitalWrite(3, HIGH);

  digitalWrite(4, HIGH);

  digitalWrite(5, HIGH);

  digitalWrite(10, LOW);

  digitalWrite(11, LOW);

}



void loop() {

  // Scan through channels

  int cnt = 1;

  digitalWrite(11, HIGH);



  for (cnt = 1; cnt <= 32; cnt++) {

    Serial.print("count: ");

    Serial.println(cnt);



    digitalWrite(10, HIGH);

    delay(1000);

    digitalWrite(10, LOW);

    delay(100);

  }



  delay(2000);



  // Reset the multiplexer

  for (int i = 1; i <= 32; i++) {

    digitalWrite(10, HIGH);

    delay(10);

    digitalWrite(10, LOW);

    delay(10);

  }



  digitalWrite(11, LOW);

}

Conclusion

This simple test provides a foundational understanding of how Arduino can effectively control a 16/32 multiplexer. Experimenting with different setups and adapting the code can open up possibilities for more advanced applications. Feel free to modify and expand upon this experiment for your specific needs.

Refer to the video below to get more details of the test: