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Introduction 

In this tutorial you will learn how to use a shift register (or serial to paralled controller). The shift register will give to your Arduino an additional 8 digital outputs, by using only 3 pins on your board
In this tutorial you will practice by using the shift register with Arduino uno to control 8 LEDs.

What you will need - Hardware

The Circuit

The connections are easy, see the image above with the breadboard circuit schematic.


You can find more info about IC here: datasheet

The code

We will use example sketch from ShiftRegister74HC595.h library.
How it works:
  • sr.setAllHight(); Turn all LEDs on
  • sr.setAllLow(); Turn all LEDs off
  • sr.set(i, HIGH); Turn LED i on ( 0 < i < 7)
  • uint8_t pinValues[] = { B10101010 }; 
  • sr.setAll(pinValues); Binary to turn on 2nd,4th,6th and 8th LED
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/*
  ShiftRegister74HC595.h - Library for easy control of the 74HC595 shift register.
  Created by Timo Denk (www.simsso.de), Nov 2014.
  Additional information are available on http://shiftregister.simsso.de/
  Released into the public domain.
*/

#include <ShiftRegister74HC595.h>
// create shift register object (number of shift registers, data pin, clock pin, latch pin)
ShiftRegister74HC595 sr (1, 2, 3, 4); 
void setup() { 
}

void loop() {
  sr.setAllHigh(); // set all pins HIGH
  delay(500);
  sr.setAllLow(); // set all pins LOW
  delay(500); 
  for (int i = 0; i < 8; i++) {
    sr.set(i, HIGH); // set single pin HIGH
    delay(2000); 
  }
  // set all pins at once
  uint8_t pinValues[] = { B10101010 }; 
  sr.setAll(pinValues); 
  delay(5000);
  // read pin (zero based)
  uint8_t stateOfPin5 = sr.get(5);
}
Download the code from here and open it with Arduino IDE. Inside you will also find additional libraries.
shiftregister595_tutorial.zip
File Size: 2 kb
File Type: zip
Download File
You can make your own modifications to the code, for example, try to change line: uint8_t pinValues[] = { B10101010 }; with uint8_t pinValues[] = { B11001100 };

Well done!

You have successfully completed one more "How to" tutorial and you learned how to use a shift register ic with Arduino. I hope you liked this, let me know in the comments. You can also post photos with your circuit!

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