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Introduction 

In this tutorial we will show you how to use the 3-Digit seven segment display with the Arduino UNO board.

​Let's get started!
​

What you will need - Hardware


​For this tutorial you will need:

The Circuit

The connections are easy, see the image above with breadboard circuit schematic.
  • Vcc to Arduino 5V Pin
  • GND to Arduino GND
  • SDI to Arduino pin
  • CLK to Arduino pin
  • LOAD to Arduino pin

The code

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//We always have to include the library
#include "LedControl.h"

/*
 Now we need a LedControl to work with.
 ***** These pin numbers will probably not work with your hardware *****
 pin 12 is connected to the DataIn 
 pin 13 is connected to the CLK 
 pin 10 is connected to LOAD 
 We have only a single MAX72XX.
 */
LedControl lc=LedControl(12,13,10,1);

/* we always wait a bit between updates of the display */
unsigned long delaytime=250;

void setup() {
  /*
   The MAX72XX is in power-saving mode on startup,
   we have to do a wakeup call
   */
  lc.shutdown(0,false);
  /* Set the brightness to a medium values */
  lc.setIntensity(0,8);
  /* and clear the display */
  lc.clearDisplay(0);
}


/*
 This method will display the characters for the
 word "Arduino" one after the other on digit 0. 
 */
void writeArduinoOn7Segment() {
  lc.setChar(0,0,'a',false);
  delay(delaytime);
  lc.setRow(0,0,0x05);
  delay(delaytime);
  lc.setChar(0,0,'d',false);
  delay(delaytime);
  lc.setRow(0,0,0x1c);
  delay(delaytime);
  lc.setRow(0,0,B00010000);
  delay(delaytime);
  lc.setRow(0,0,0x15);
  delay(delaytime);
  lc.setRow(0,0,0x1D);
  delay(delaytime);
  lc.clearDisplay(0);
  delay(delaytime);
} 

/*
  This method will scroll all the hexa-decimal
 numbers and letters on the display. You will need at least
 four 7-Segment digits. otherwise it won't really look that good.
 */
void scrollDigits() {
  for(int i=0;i<13;i++) {
    lc.setDigit(0,3,i,false);
    lc.setDigit(0,2,i+1,false);
    lc.setDigit(0,1,i+2,false);
    lc.setDigit(0,0,i+3,false);
    delay(delaytime);
  }
  lc.clearDisplay(0);
  delay(delaytime);
}

void loop() { 
  writeArduinoOn7Segment();
  scrollDigits();
}
Download the code from here and open it with Arduino IDE.
lcdemo7segment.zip
File Size: 9 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 3-Digit Seven Segment Display.
I hope you liked this, let me know in the comments.

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