evil_jinx
Published

It's the Final Countdown!

A cool countdown on a 7-segment display, with a "red-alert" LED! It goes from 5 to 0, then the LED kicks in. The code is all explained.

BeginnerFull instructions provided316
It's the Final Countdown!

Things used in this project

Hardware components

LED (generic)
LED (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×10
7 Segment LED Display, InfoVue
7 Segment LED Display, InfoVue
×1
Arduino UNO
Arduino UNO
×1

Story

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Schematics

Here's the very simple circuit schematic

Code

The code that powers this project.

C/C++
This code is very simple, in fact. Clear all text in the Arduino software, then copy + paste this code.
// variables to decide which digital pins correspond to which letter
int pinA = 2;
int pinB = 3;
int pinC = 4;
int pinD = 5;
int pinE = 6;
int pinF = 7;
int pinG = 8;
int pinH = 9;
int pinI = 10;
int pinJ = 11;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pins as outputs.
  pinMode(pinA, OUTPUT);     
  pinMode(pinB, OUTPUT);     
  pinMode(pinC, OUTPUT);     
  pinMode(pinD, OUTPUT);     
  pinMode(pinE, OUTPUT);     
  pinMode(pinF, OUTPUT);     
  pinMode(pinG, OUTPUT);   
  pinMode(pinH, OUTPUT);  
  pinMode(pinI, OUTPUT);  
  pinMode(pinJ, OUTPUT);
   }
     
void loop() {
  // display number 5 
  digitalWrite(pinA, HIGH);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, LOW);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, LOW);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(1000);               // wait for a second
  
// display number 4
  digitalWrite(pinA, HIGH);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, LOW);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, LOW);
  digitalWrite(pinH, LOW);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(1000);               // wait for a second
  
// display number 3
  digitalWrite(pinA, HIGH);   
  digitalWrite(pinB, LOW);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, LOW);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(1000);               // wait for a second
  
// display number 2
  digitalWrite(pinA, HIGH);   
  digitalWrite(pinB, LOW);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, LOW);   
  delay(1000);               // wait for a second
  
// display number 1
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, LOW);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, LOW);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, LOW);
  digitalWrite(pinH, LOW);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(1000);               // wait for a second
  
// display number 0
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, HIGH); // pinF boots the LED   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second
  
// turn the LED off
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second

// turn the LED on
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, HIGH);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second
  
// turn the LED off
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second 

// turn the LED on
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, HIGH);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second
  
// turn the LED off
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second
  
//turn the LED on
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, HIGH);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for half a second
  
// turn the LED off
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(500);               // wait for  half a second

//turn the LED on for 4 seconds
  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, HIGH);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, HIGH);   
  digitalWrite(pinE, HIGH);   
  digitalWrite(pinF, HIGH);   
  digitalWrite(pinG, HIGH);
  digitalWrite(pinH, HIGH);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, HIGH);   
  delay(4000);               // wait for 4 seconds 

  digitalWrite(pinA, LOW);   
  digitalWrite(pinB, LOW);   
  digitalWrite(pinC, LOW);   
  digitalWrite(pinD, LOW);   
  digitalWrite(pinE, LOW);   
  digitalWrite(pinF, LOW);   
  digitalWrite(pinG, LOW);
  digitalWrite(pinH, LOW);
  digitalWrite(pinI, LOW);
  digitalWrite(pinJ, LOW);   
  delay(10000);               // wait for 10 seconds 
  }

Credits

evil_jinx

evil_jinx

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