Arduino and a 7 segment display example

In this example we will connect a 7 segment display to an Arduino. There are 2 types of 7 segment displays, a common anode type and a common cathode type. This example used the common anode type, you can still use a common cathode type but the values will be different in the code.

Basically as the name suggests these are simply displays with multiple LEDs in them

Schematic

Code

[codesyntax lang=”cpp”]

const int  A = 4;
const int  B = 5;
const int  C = 6;
const int  D = 7;
const int  E = 8;
const int  F = 9;
const int  G = 10;

//all of the values below are for a common anode display
//coomon cathode would need the values inverted HIGH -> LOW
void clearDisplay()
{
//sets the LEDs high
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
}

void one()
{
//Displays 1
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, HIGH);
}

void two()
{
//Displays 2
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, HIGH);
digitalWrite(G, LOW);
}

void three()
{
//Displays 3
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, LOW);
}

void four()
{
//Displays 4
digitalWrite(A, HIGH);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
}

void five()
{
//Displays 5
digitalWrite(A, LOW);
digitalWrite(B, HIGH);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
}

void six()
{
//Displays 6
digitalWrite(A, LOW);
digitalWrite(B, HIGH);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
}

void seven()
{
//Displays 7
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
}

void eight()
{
//Displays 8
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
}

void nine()
{
//Displays 9
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
}

void zero()
{
//Displays 0
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, HIGH);
}
void LoopDisplay()
{
//Loop through all numbers
one();
delay(1000);
two();
delay(1000);
three();
delay(1000);
four();
delay(1000);
five();
delay(1000);
six();
delay(1000);
seven();
delay(1000);
eight();
delay(1000);
nine();
delay(1000);
zero();
delay(1000);
}

void setup()
{
//Setup our pins
pinMode(A, OUTPUT);
pinMode(B, OUTPUT);
pinMode(C, OUTPUT);
pinMode(D, OUTPUT);
pinMode(E, OUTPUT);
pinMode(F, OUTPUT);
pinMode(G, OUTPUT);
}

void loop()
{
clearDisplay();
LoopDisplay();
}

[/codesyntax]

Links

UNO R3 MEGA328P ATMEGA16U2 + USB Cable