Arduino Interfacing With CD74HC4067 16-channel MUX

The CD74HC4067 is a 16-channel multiplexer. This module is used when you need to monitor multiple sensors or input devices on a single port. This is helpful in devices where there are only 1 or few analog pins. The Arduino has 6 analog pins, which means we can monitor a maximum of 6 sensors. With the help of CD74HC4067, we can monitor 16 sensors on a single Analog pin. In this tutorial, we will see a fast and efficient method of interfacing Arduino with CD74HC4067.

Supplies

Arduino Uno or Nano or any Arduino board
CD74HC4067 - 16 channel multiplexer
Jumper wires
Power supply cable for Arduino
Any sensor(s) of your choice

Step 1: Make Circuit Connections

Follow this tutorial for circuit connection: https://electropeak.com/learn/interfacing-cd74hc4067-16-channel-analog-digital-multiplexer-with-arduino/

Step 2: Install Required Library in Arduino IDE

Install the light_CD74HC4067 library in Arduino IDE

Go to Sketch > Include Library > Manage Libraries

Search "light_CD74HC4067" and install.

Step 3: Upload Code to Arduino

Upload the below code to your Arduino:

    /*
	 * Connect the four control pins to any Arduino pins.
	 * This example uses digital pins 4, 5, 6, and 7.
	 * You will get analog output at the Analog pin that you connect to Sig pin of CD74HC4067
	 * This examples loops through all channels and prints the analog input at all 16 channels
	*/


	#include <light_CD74HC4067.h>


	            // s0 s1 s2 s3: select pins
	CD74HC4067 mux(8, 9, 10, 11);  // create a new CD74HC4067 object with its four select lines - 8,9,10,11


	const int signal_pin = A0; // Pin A0 - Connected to Sig pin of CD74HC4067


	void setup()
	{
	    Serial.begin(9600);
	    pinMode(signal_pin, INPUT); // Set as input for reading through signal pin
	}


	void loop()
	{
	  // loop through channels 0 - 15
	    for (byte i = 0; i < 16; i++) {
	        mux.channel(i);
	        int val = analogRead(signal_pin);                       // Read analog value
	        Serial.println("Channel "+String(i)+": "+String(val));  // Print value
	        delay(500);
	    }
	  delay(2000);
	}