How to use a Shift Register 74HC595

Shift Register

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

For this tutorial you will need: Arduino uno Breadboard Shift Register IC (74HC595) 4x Red LEDs 4x Green LEDs 8x 330 Ohm (or 220) resistors

The Circuit

The connections are easy, see the image above with the breadboard circuit schematic. You can find more info about IC here: datasheet

Here's 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

The Code ::

********************************************************************************

/*

  ShiftRegister74HC595.h - Library for easy control of the 74HC595 shift register.

*/

#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);

  

}

********************************************************************************

Note :: 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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