Arduino Seven Segment Display Interface

Today, we will see how we can use a common cathode seven segment display with an Arduino UNO.

The Circuit - 

The Code - 

int top = 8;

int mid = 6;

int bot = 4;

int dot = 2;

int top_left = 7;

int bot_left = 5;

int top_right = 9;

int bot_right = 3;

void setup(){

  pinMode(top, OUTPUT);

  pinMode(mid, OUTPUT);

  pinMode(bot, OUTPUT);

  pinMode(dot, OUTPUT);

  pinMode(top_left, OUTPUT);

  pinMode(bot_left, OUTPUT);

  pinMode(top_right, OUTPUT);

  pinMode(bot_right, OUTPUT);

}

void loop(){

  zero();

  delay(1000);

  blank();

  delay(1000);

  

  one();

  delay(1000);

  blank();

  delay(1000);

  

  two();

  delay(1000);

  blank();

  delay(1000);

  

  three();

  delay(1000);

  blank();

  delay(1000);

  

  four();

  delay(1000);

  blank();

  delay(1000);

  

  five();

  delay(1000);

  blank();

  delay(1000);

  six();

  delay(1000);

  blank();

  delay(1000);

  seven();

  delay(1000);

  blank();

  delay(1000);

  eight();

  delay(1000);

  blank();

  delay(1000);

  nine();

  delay(1000);

  blank();

  delay(1000);

}

void blank(){

  digitalWrite(top, LOW);

  digitalWrite(mid, LOW);

  digitalWrite(bot, LOW);

  digitalWrite(dot, LOW);

  digitalWrite(top_left, LOW);

  digitalWrite(bot_left, LOW);

  digitalWrite(top_right, LOW);

  digitalWrite(bot_right, LOW);

}

void zero(){

  digitalWrite(top, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

void one(){

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

  digitalWrite(dot, HIGH);

}

void two(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_left, HIGH);

}

void three(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

void four(){

  digitalWrite(top_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(dot, HIGH);

}

void five(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_right, HIGH);

}

void six(){

  digitalWrite(dot, HIGH);

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_left, HIGH);

  digitalWrite(bot_right, HIGH);

}

void seven(){

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

  digitalWrite(top, HIGH);

  digitalWrite(dot, HIGH);

}

void eight(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

void nine(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

The Video -