7-Segment LED Display

How to build and control a 7 segment LED counter on an Arduino:

by J.B. Wylzan

Project :  7-Segment LED Counter

This project  shows how to control a 7-Segment Led Display.
  The 7-segment display is actually like the train of LEDs found on our previous projects. The only difference is the leds are now formed in a figure of eight(8) instead.

Hardware:
7-segment led display
connecting wires
breadboard
Arduino R3 UNO board

Schematic Diagram:

Block Diagram:

Code # 20:

/*
  iHackLab 7-Segment Counter
  powered by Arduino
  sketched by J.B. Wylzan
  modified by Lawsinium

  The 7-segment display will count from 0 to 9 .
  This example code is public domain.
 */

int A =4;
int B =5;
int C =6;
int D= 7;
int E =8;
int F =9;
int G= 10;
int H= 11;
int x = 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);
  pinMode(H, OUTPUT);
}

void loop()
{
   zero();
  delay(x);
   one();
  delay(x);
  two();
    delay(x);
  three();
    delay(x);
  four();
    delay(x);
  five();
    delay(x);
  six();
    delay(x);
  seven();
    delay(x);
  eight();
    delay(x);
  nine();
    delay(x);
}

void zero()
{
  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, HIGH);
  digitalWrite(H, LOW);
}

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

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

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

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

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

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

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

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

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

Challenge: 
Sketch a program wherein the 7-segment counter displays the alphabet.

Actual Layout:

Procedure:
1. Build the prototype as shown above
2. Run the Arduino Interface
3. Select File > New
4. Copy Code # 20 above
5. Paste Code #20
6. Click File > Save
7. Click Verify
8. Click Upload
9. The 7-segment display will count from 0 to 9..


Disclaimer:  We shall not be liable for any loss or damage of whatever nature - direct, indirect, consequential, or otherwise - which may arise as a result of your use of any information on this website. However, if you are interested in using any of the projects for personal or educational purposes, please inform the author by email. 

Public Domain Notice: Copyright (c) 2000. All rights reserved. This article is part of a book entitled iHackRobot. Copies are welcome to be shared or distributed publicly as long proper citations are observed. Please cite as follows: Biotronics: The Silver Species, Joey Lawsin, 1988, USA.

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