Better instructions

[julesmoretti]

Could you please provide a clearer example using Serial to print the result, please?

Thank you.

[waspinator]

try this for printing out which channel is currently being used.

#include <CD74HC4067.h>

               // s0 s1 s2 s3
CD74HC4067 my_mux(4, 5, 6, 7);  // create a new CD74HC4067 object with its four control pins
const int g_common_pin = A0; // select a pin to share with the 16 channels of the CD74HC4067

void setup()
{
    pinMode(g_common_pin, OUTPUT); // set the initial mode of the common pin.
	                               // This can be changed in loop() for for each channel.

    // initialize serial communications at 9600 bps
    Serial.begin(9600);
}

void loop()
{
    digitalWrite(g_common_pin, HIGH);

    for (int i = 0; i < 16; i++) {
        my_mux.channel(i);
        Serial.print("channel = ");
        Serial.println(i);
        delay(1000);
    }
}

[julesmoretti]

Thank you, that works for letting me know which channel but then somehow to read it is not working. I have tried to follow also this tutorial with no luck: http://blog.codebender.cc/2014/01/30/mux74hc4067/ the button press one, when hooking things up with buttons I got from Amazon it is not working. (https://www.amazon.com/gp/product/B018RYSTD0/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1)

when I try their tutorial and press the first button other inputs are read as pressed even though I only pressed one button.

Some people talks about debouncing but.... not super straight forward.

Also when I run it with serial it is not live. when I click button down it takes a while to apear, it is super strange.

My code is as follow based on the above:

#include <CD74HC4067.h>

               // s0 s1 s2 s3
CD74HC4067 my_mux(4, 5, 6, 7);  // create a new CD74HC4067 object with its four control pins
const int g_common_pin = 8; // select a pin to share with the 16 channels of the CD74HC4067

int sig = 3;
int val = 0;

void setup()
{
    pinMode(g_common_pin, OUTPUT); // set the initial mode of the common pin.
                                 // This can be changed in loop() for for each channel.

    // initialize serial communications at 9600 bps
    Serial.begin(9600);
}

void loop()
{
    digitalWrite(g_common_pin, HIGH);

    for (int i = 0; i < 4; i++) {
      if (i == 0) Serial.println("--------");
        my_mux.channel(i);
        val = digitalRead(sig);
        Serial.print("channel = ");
        Serial.print(i);
        Serial.print(" - val: ");
        Serial.print(val);
        Serial.print(" - ");
        // delay(200);
        if (i == 3) Serial.println("");
    }
}

Thank you for the response and help :)

[bsvdoom]

add some delay between the two lines:
my_mux.channel(i);
delay(10);
val = digitalRead(sig);