Arduino倒数计时器-项目开发

Arduino倒数计时器倒数计时器-项目开发项目开发

Components and supplies

Breadboard (generic)

× 1

Jumper wires (generic)

× 1

SparkFun 7-Segment Serial Display - Red

No breakout board board used in this project

Arduino IDE

About this project

This project was a project designed specifically because I did not have a timer on hand. To use this project you simply just upload the code to your arduino (any type will work)

you will just need upload the code to the arduino and the countdown will automatically start. Should you want to change the total time you will need to change this part of code.

REMEMBER!!! 1000= 1 sec. so 60000 = sec 60 or the equation (SECx1000) will give you your total number to insert into the place of the 60000. Finally when you press the

reset button the counter automatically restarts.

long n = 60000; //start time -> CAN CHANGE TO WHATEVER TIME YOU WANT

Code

The code

The codeArduino

//pin 1 - E = 6

//pin 10 - F = 11

//pin 5 - G = 9

//pin 3 is decimal

/*

12 11 10 9 8 7

| | | | | |

A

---

F | | B

| | | | | |

1 2 3 4 5 6

*/

//pin 12 - first digit = 1

//pin 9 - second digit = 2

//pin 8 - third digit = 3

//pin 6 fourth digit = 4

const int a = 12;

const int b = 10;

const int c = 8;

int p = 0;

const int d2 =2;

const int d3 =3;

const int d4 =4;

long n = 60000; //start time -> CAN CHANGE TO WHATEVER TIME YOU WANT

int x = 100;

int del = 55; //delay value

void setup()

{

pinMode(d1, OUTPUT);

pinMode(d2, OUTPUT);

pinMode(e, OUTPUT);

pinMode(f, OUTPUT);

pinMode(g, OUTPUT);

pinMode(p, OUTPUT);

pinMode(startStopReset, INPUT);

digitalWrite(startStopReset, HIGH);

}

void loop()

{

clearLEDs();

pickDigit(2);

pickNumber((n/x/100)%10);

clearLEDs();

pickDigit(3);

dispDec(3);

pickNumber((n/x/10)%10);

delayMicroseconds(del);

if (digitalRead(13) == LOW)

{

n = 60000; //re-start time -> CHANGE TO WHATEVER TIME YOU ORIGONALLY SET (start time)

}

}

void pickDigit(int x) //changes digit

{

digitalWrite(d1, HIGH);

digitalWrite(d2, HIGH);

digitalWrite(d1, LOW);

break;

case 2:

digitalWrite(d2, LOW);

break;

case 3:

digitalWrite(d3, LOW);

digitalWrite(p, HIGH); //new

break;

default:

digitalWrite(d4, LOW);

switch(x)

{

default:

zero();

break;

case 1:

one();

break;

case 2:

two();