#CD74HC4067 ARDUINO CODE#

Other circuit and code can be imagined to develop your own functionalities. It is possible with this simple component to increase the number of I/O of a microcontroller. Constants #define number_of_mux 1 #define numOfMuxPins number_of_mux * 8 #define enPin 2 #define channelA 4 #define channelB 7 #define channelC 8 //Parameters const int comPin = 3 void setup ( ) Results

#CD74HC4067 ARDUINO FREE#

This post is brought to you by – everything for makers and electronics enthusiasts, with free delivery worldwide.To select a channel on the multiplexer, we need to activate the integrated circuit by setting the INH pin to LOW, and setting the channels A,B and C to the values descripbed in the logic table. You can order them in breakout boards, through-hole or surface-mount package. If you’re considering the 74HC4067 or hadn’t known about it previously, we hope you found this of interest. The results are shown in the video for this step. 5V to 74HC4067 pin 1 to power the LEDs

#CD74HC4067 ARDUINO HOW TO#

74HC4067 demultiplexer demonstration (1 to 16) A lightweight, low memory consuming CD74HC4067 Library for Arduino IDE based microcontrollers Features Lightweight Consumes much less memory (RAM) compared to other CD74HC4067 libraries Easy to use How to Use Library Include the library in sketch include for some reason you have the 74HCT4067 it can only work on 4.55.5V DC. This library can be downloaded through Arduino IDE. The first thing to note is that the 74HC4067 can operate on voltages between 2 and 6V DC, which allows use with 3.3V and 5V microcontrollers and boards such as Arduino and Raspberry Pi. lightCD74HC4067 will save much more memory and is easy to use. The other libraries are quite memory-consuming. We don’t need current-limiting resistors for the LEDs due to the internal resistance in the 74HC4067. For the Arduino program, would suggest using the lightCD74HC4067 library for MUX. So you could connect SIG to 5v, and then be able to switch the 5v to one of 16 channel pins if you needed to control 16 relays. A fast example of this is by controlling one of sixteen LEDs each connected to an output pin, and with 5V on the 74HC4067 common pin. The CD74HC4067 is capable of more than reading analog signals. Now for the opposite function – sending current from the common pin to one of sixteen outputs. The video in this step shows the results. MuxValues=analogRead(0) // read the vlaue on that pin and store in array SetPin(i) // choose an input pin on the 74HC4067 Serial.println('Values from multiplexer:')

#CD74HC4067 ARDUINO SERIAL#

dumps captured data from array to serial monitor connect 74HC4067 S0~S3 to Arduino D7~D4 respectivelyīyte muxValues = ĭDRD = B11111111 // set PORTD (digital 7~0) to outputs see truth table on page 2 of TI 74HC4067 data sheet control pins output table in array form 74HC4067 multiplexer demonstration (16 to 1) This simply sets each input pin in turn, then reads the ADC value into an array – whose values are then sent to the serial monitor. In the following example sketch, you can see how we’ve put the binary values for each control possibility in the array byte controlPins – which is then used to set the pins easily in void loop(). For example – to select I/O 15 you need to turn on all the control pins – so you just have to set Arduino PORTD to B11110000 (which is binary 15 LSB first) and much neater than using four digitalWrite() functions.

We do this as it reduces the code required and conceptually I feel it’s easier. With both of the examples we’ll use port manipulation to control the digital pins which are connected to the 74HC4067’s control pins. When doing so – take note of the limitations mentioned earlier – take some resistance measurements in your situation to determine what the maximum value will be from your ADC and calibrate code accordingly. In this example we connect the common pin to the board’s analog input pin – so this can be used as a method of reading sixteen analog signals (one at a time) using only one ADC.

This is where we select one input pin of sixteen and allow current to flow through to the common pin (1). Pin 15 of the ‘4067 is set to GND, and control pins S0~S3 are connected to Arduino digital output pins D7~D4 respectively. For demonstration purposes we’re using an Arduino Uno-compatible board with the 74HC4067 running from a 5V supply voltage. Now to show an example of both multiplexing and demultiplexing.

Cd74hc4067 arduino