查看: 3394|回复: 2

[入门] 循环显示8位数码管

循环显示8位数码管

先看演示视频吧。

1. 本次实验的是一位共阳数码管。8位数码管由7根棒状led（拼接数字）和一个led灯（拼接小数点）组成。通过分别控制8颗led灯的明灭，来显示不同的数字。
2. 先借Jane的图说明一下连线（https://mc.dfrobot.com.cn/thread-2539-1-1.html）
循环显示8位数码管图1

a,b,c,d,e,f,g,DP,分别连接2-9数字针脚，+接开发板的10针脚，我只接了一个+
3.使用数组，初始化0-9每个数字需要点亮的LED管，比如，数字1，只需将b和c管设置为0,其他管设置为1即可。因此，数字1的数组是{1,0,0,1,1,1,1,1}。其他数字同理。[mw_shl_code=c,true]
int num0[8] = {0,0,0,0,0,0,1,1};
int num1[8] = {1,0,0,1,1,1,1,1};
int num2[8] = {0,0,1,0,0,1,0,1};
int num3[8] = {0,0,0,0,1,1,0,1};
int num4[8] = {1,0,0,1,1,0,0,1};
int num5[8] = {0,1,0,0,1,0,0,1};
int num6[8] = {0,1,0,0,0,0,0,1};
int num7[8] = {0,0,0,1,1,1,1,1};
int num8[8] = {0,0,0,0,0,0,0,1};
int num9[8] = {0,0,0,0,1,0,0,1};
[/mw_shl_code]
4. 初始化针脚模式
[mw_shl_code=c,true]
void setup() {
  for(int i=2;i<=10;i++)
pinMode(i,OUTPUT);
}
[/mw_shl_code]
5. 接下来就是循环显示出各个数字了。
[mw_shl_code=applescript,true]
void loop() {
  digitalWrite(10,1);
  for(int i=2;i<=9;i++)
digitalWrite(i,num0[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num1[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num2[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num3[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num4[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num5[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num6[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num7[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num8[i-2]);
  delay(1000);
  for(int i=2;i<=9;i++)
digitalWrite(i,num9[i-2]);
  delay(1000);
}
[/mw_shl_code]
6. 进阶，封装函数
[mw_shl_code=c,true]
//共阳八段数码管（含小数点），各数字定义,0亮，1灭
int num[10][8]={
  {0,0,0,0,0,0,1,1},
  {1,0,0,1,1,1,1,1},
  {0,0,1,0,0,1,0,1},
  {0,0,0,0,1,1,0,1},
  {1,0,0,1,1,0,0,1},
  {0,1,0,0,1,0,0,1},
  {0,1,0,0,0,0,0,1},
  {0,0,0,1,1,1,1,1},
  {0,0,0,0,0,0,0,1},
  {0,0,0,0,1,0,0,1}
  };
void ShowNum(int x,int y);//x显示的数字,y显示的秒数
void setup() {
  // put your setup code here, to run once:
  for(int i=2;i<=10;i++)
pinMode(i,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(10,1);
  ShowNum(8,3000);
}

void ShowNum(int x,int y)
{
  for(int i=2;i<=9;i++)
digitalWrite(i,num[x][i-2]);
  delay(y);
}
[/mw_shl_code]
7.附件，完整代码