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Introduction 

In this tutorial we will show you how to use the 4-Digit seven segment display with the Arduino UNO board. We will print on display the analog value from one potentiometer. This pcb module uses one 74HC595 IC (shift register) for every 7seg display digit. 

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​Let's get started!
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What you will need - Hardware


​For this tutorial you will need:

The Circuit

The connections are easy :
4-Digit  Seven Segment connection:
  • Vcc to Arduino 5V Pin
  • GND to Arduino GND
  • SDI to Arduino pin 2
  • CLK to Arduino pin 3
  • LOAD to Arduino pin 4
Potentiometer connection:
  • 1st leg to Arduino 5V
  • 2nd leg to Arduino A0
  • 3st leg to Arduino GND

The code

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/* 
 *  4 Digitl 7 segment display PCB board with (4) 74HC595 shift register ICs
 *  Arduino Tutorial - www.Ardumotive.com
 *  Dev: Michalis Vasilakis // Date: 23/1/2018 // Ver:1.0
 */
#include <ShiftRegister74HC595.h>
// create shift register object (number of shift registers, data pin, clock pin, latch pin)
ShiftRegister74HC595 sr (4, 2, 3, 4); 
const int pot = A0;
int value,digit1,digit2,digit3,digit4; 
uint8_t  numberB[] = {B11000000, //0
                      B11111001, //1 
                      B10100100, //2
                      B10110000, //3 
                      B10011001, //4
                      B10010010, //5
                      B10000011, //6
                      B11111000, //7
                      B10000000, //8
                      B10011000 //9
                     };
                        
void setup() { 
  //blink();
}

void loop() {
  //Read from Analog1
  value=analogRead(pot);
  //Split number to digits:
  digit4=value % 10 ;
  digit3=(value / 10) % 10 ;
  digit2=(value / 100) % 10 ;
  digit1=(value / 1000) % 10 ;
  //Send them to 7 segment displays
  uint8_t numberToPrint[]= {numberB[digit4],numberB[digit3],numberB[digit2],numberB[digit1]};
  sr.setAll(numberToPrint); 
  //Reset them for next read
  digit1=0;
  digit2=0;
  digit3=0;
  digit4=0;
  delay(1000); // Read and print every 1 sec
}

//Blink
void blink(){
  for(int i = 0; i<2; i++){
    sr.setAllHigh(); // set all pins HIGH
    delay(1000);
    sr.setAllLow(); // set all pins LOW
    delay(1000);
  }
}
Download the code from here and open it with Arduino IDE.
4digit7seg595.zip
File Size: 4 kb
File Type: zip
Download File

Well done!

You have successfully completed one more Arduino "How to" tutorial and you learned how to use the 4-Digit 7 Segment Display 74HC595 module.
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I hope you liked this, let me know in the comments.

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