The 4 digit 7 segment display in an intermediate level project. This project is mainly focused on how to connect the 4 digit 7 segment display with the Arduino. Once you have learnt the connection and the logic of working. Nobody can stop you from reprogramming the 4 digit 7 segment display.

To get started we will need an Arduino (Uno or whichever one you have that would not make a difference). But ideally as the number of pins increase on our Arduino boards the capability is higher and better projects can be built.

Don’t know Arduino yet? Click here to learn about the Pins and other ports available on it.

Things Needed

• 4 digit 7 segment display
• Arduino Uno
• Breadboard
• Jumper cables
• Resistors x 4 (200Ω)

Circuit Diagram

Code

Please download the SevSeg.h library before running the code. Click here!

#include <SevSeg.h>

int pinA = 11;int pinB = 7;int pinC = 4;int pinD = 2;
int pinE = 1;int pinF = 10;int pinG = 5;
int pinDP = 3;int D1 = 12;int D2 = 9;int D3 = 8; int D4 = 6;

void setup() {//set all segments & digits as outputs
pinMode(pinA, OUTPUT);
pinMode(pinB, OUTPUT);
pinMode(pinC, OUTPUT);
pinMode(pinD, OUTPUT);
pinMode(pinE, OUTPUT);
pinMode(pinF, OUTPUT);
pinMode(pinG, OUTPUT);
pinMode(pinDP, OUTPUT);
pinMode(D1, OUTPUT);
pinMode(D2, OUTPUT);
pinMode(D3, OUTPUT);
pinMode(D4, OUTPUT);
}

void loop() {
  
  digit1();zero();delay(500);
  digit2();one();delay(500);
  digit3();two();delay(500);
  digit4();three();delay(500);
  digit3();four();delay(500);
  digit2();five();delay(500);
  digit1();six();delay(500);
  digit2();seven();delay(500);
  digit3();eight();delay(500);
  digit4();nine();delay(500);
 
  all4Digits();
  allNumbers();

}


//functions representing numbers 0-9
void zero(){
digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, HIGH);
  }

  void one(){
digitalWrite(pinA, HIGH);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
}

void two(){
  digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, LOW);
  }
  
  void three(){
    digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, LOW);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, LOW);
    }
    
  void four(){
    digitalWrite(pinA, HIGH);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
    }
    
  void five(){
    digitalWrite(pinA, LOW);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, LOW);
digitalWrite(pinD, LOW);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
    }
    
  void six(){
    digitalWrite(pinA, LOW);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, LOW);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
    }
    
  void seven(){
    digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
    }
    
  void eight(){
    digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
    }
    
  void nine(){
    digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
    }

    void allNumbers(){
one();delay(500);
two();delay(500);
three();delay(500);
four();delay(500);
five();delay(500);
six();delay(500);
seven();delay(500);
eight();delay(500);
nine();delay(500);
      }

  void turnOffAllSegments(){
          digitalWrite(pinA, LOW);
digitalWrite(pinB, LOW);
digitalWrite(pinC, LOW);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
          }


    //functions to select individual digits on the display
    void digit1(){
      digitalWrite(D1, HIGH);
digitalWrite(D2, LOW);
digitalWrite(D3, LOW);
digitalWrite(D4, LOW);
      }
      
    void digit2(){
      digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, LOW);
digitalWrite(D4, LOW);
      }
      
    void digit3(){
      digitalWrite(D1, LOW);
digitalWrite(D2, LOW);
digitalWrite(D3, HIGH);
digitalWrite(D4, LOW);
      }
      
    void digit4(){
      digitalWrite(D1, LOW);
digitalWrite(D2, LOW);
digitalWrite(D3, LOW);
digitalWrite(D4, HIGH);
      }

      void all4Digits(){
        digitalWrite(D1, HIGH);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
        }