Arduino之4位数码管实验（简单秒表）
Arduino 4位数码管（简单秒表）实验。包含了4位共阴极和共阳极数码管实验的代码。
工具/原料
Arduino UNO开发板1块
220欧电阻8个
面包线若干
4位共阴极数码管1个、4位共阳极数码管1个
5v电源1块或电源线1根
面包板1块
电路连线方法
前篇经验对于数码管的管脚做了详细的介绍。如有需要，可参考本人经验：http://jingyan.baidu.com/article/1709ad80bfc8e84634c4f011.html
详细的接线对应图如下表，简单清晰明了。
4位共阴极数码管实验代码
int a=1;
int b=2;
int c=3;
int d=4;
int e=5;
int f=6;
int g=7;
int p=8;
int d4=9;
int d3=10;
int d2=11;
int d1=12;
long n=0;
int x=100;
int del=55;
void setup()
{
pinMode(a,OUTPUT);
pinMode(b,OUTPUT);
pinMode(c,OUTPUT);
pinMode(d,OUTPUT);
pinMode(e,OUTPUT);
pinMode(f,OUTPUT);
pinMode(g,OUTPUT);
pinMode(p,OUTPUT);
pinMode(d4,OUTPUT);
pinMode(d3,OUTPUT);
pinMode(d2,OUTPUT);
pinMode(d1,OUTPUT);
}
void loop()
{
clearLEDs();
pickDigit(1);
pickNumber((n/x/1000)%10);
delayMicroseconds(del);
clearLEDs();
pickDigit(2);
pickNumber((n/x/100)%10);
delayMicroseconds(del);
clearLEDs();
pickDigit(3);
dispDec(3);
pickNumber((n/x/10)%10);
delayMicroseconds(del);
clearLEDs();
pickDigit(4);
pickNumber(n/x%10);
delayMicroseconds(del);
n++;
if(digitalRead(13)==LOW)
{
n=0;
}
}
void pickDigit(int x)
{
digitalWrite(d1,HIGH);
digitalWrite(d2,HIGH);
digitalWrite(d3,HIGH);
digitalWrite(d4,HIGH);
switch(x)
{
case 1:
digitalWrite(d1,LOW);
break;
case 2:
digitalWrite(d2,LOW);
break;
case 3:
digitalWrite(d3,LOW);
break;
default:
digitalWrite(d4,LOW);
break;
}
}
void pickNumber(int x)
{
switch(x)
{
default:
zero();
break;
case 1:
one();
break;
case 2:
two();
break;
case 3:
three();
break;
case 4:
four();
break;
case 5:
five();
break;
case 6:
six();
break;
case 7:
seven();
break;
case 8:
eight();
break;
case 9:
nine();
break;
}
}
void dispDec(int x)
{
digitalWrite(p,HIGH);
}
void clearLEDs()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
digitalWrite(p,LOW);
}
void zero()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,LOW);
}
void one()
{
digitalWrite(a,LOW);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
void two()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,LOW);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,LOW);
digitalWrite(g,HIGH);
}
void three()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,HIGH);
}
void four()
{
digitalWrite(a,LOW);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void five()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,LOW);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void six()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void seven()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
void eight()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void nine()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,LOW);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
设置引脚工作方式，in为输入，out为输出。
共阴极条件下，设置循环条件。
数码管显示数字“0”.
数码管显示数字“1”.
4位共阳极数码管实验代码
int a=1;
int b=2;
int c=3;
int d=4;
int e=5;
int f=6;
int g=7;
int p=8;
int d4=9;
int d3=10;
int d2=11;
int d1=12;
long n=0;
int x=100;
int del=55;
void setup()
{
pinMode(a,OUTPUT);
pinMode(b,OUTPUT);
pinMode(c,OUTPUT);
pinMode(d,OUTPUT);
pinMode(e,OUTPUT);
pinMode(f,OUTPUT);
pinMode(g,OUTPUT);
pinMode(p,OUTPUT);
pinMode(d4,OUTPUT);
pinMode(d3,OUTPUT);
pinMode(d2,OUTPUT);
pinMode(d1,OUTPUT);
}
void loop()
{
clearLEDs();
pickDigit(1);
pickNumber((n/x/1000)%10);
delayMicroseconds(del);
clearLEDs();
pickDigit(2);
pickNumber((n/x/100)%10);
delayMicroseconds(del);
clearLEDs();
pickDigit(3);
dispDec(3);
pickNumber((n/x/10)%10);
delayMicroseconds(del);
clearLEDs();
pickDigit(4);
pickNumber(n/x%10);
delayMicroseconds(del);
n++;
if(digitalRead(13)==HIGH)
{
n=0;
}
}
void pickDigit(int x)
{
digitalWrite(d1,LOW);
digitalWrite(d2,LOW);
digitalWrite(d3,LOW);
digitalWrite(d4,LOW);
switch(x)
{
case 1:
digitalWrite(d1,HIGH);
break;
case 2:
digitalWrite(d2,HIGH);
break;
case 3:
digitalWrite(d3,HIGH);
break;
default:
digitalWrite(d4,HIGH);
break;
}
}
void pickNumber(int x)
{
switch(x)
{
default:
zero();
break;
case 1:
one();
break;
case 2:
two();
break;
case 3:
three();
break;
case 4:
four();
break;
case 5:
five();
break;
case 6:
six();
break;
case 7:
seven();
break;
case 8:
eight();
break;
case 9:
nine();
break;
}
}
void dispDec(int x)
{
digitalWrite(p,LOW);
}
void clearLEDs()
{
digitalWrite(a,HIGH);
digitalWrite(b,,HIGH);
digitalWrite(c,,HIGH);
digitalWrite(d,,HIGH);
digitalWrite(e,,HIGH);
digitalWrite(f,,HIGH);
digitalWrite(g,,HIGH);
digitalWrite(p,,HIGH);
}
void zero()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,HIGH);
}
void one()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void two()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void three()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,LOW);
}
void four()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
void five()
{
digitalWrite(a,LOW);
digitalWrite(b,HIGH);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,HIGH);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
void six()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
void seven()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
}
void eight()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
void nine()
{
digitalWrite(a,LOW);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,LOW);
digitalWrite(e,HIGH);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
}
器材
编程界面
