Arduino 入门到精通 例程17-四位数码管.doc

Arduino 入门到精通 例程17这次我们进行的实验是使用arduino驱动一块共阴四位数码管驱动数码管限流电阻肯定是必不可少的，限流电阻有两种接法，一种是在d1-d4阳极接，总共接4颗这种接法好处是需求电阻比较少，但是会产生每一位上显示不同数字亮度会不一样，1最亮，8最暗另外一种接法就是在其他8个引脚上接，这种接法亮度显示均匀，但是用电阻较多本次实验使用8颗220Ω电阻（因为没有100Ω电阻，所以使用220Ω的代替，100欧姆亮度会比较高）4位数码管总共有12个引脚，小数点朝下正放在面前时，左下角为1,其他管脚顺序为逆时针旋转左上角为最大的12号管脚下图为数码管的说明手册下面是硬件连接图下面是程序；//显示1234 //设置阴极接口 int a = 1; int b = 2; int c = 3; int d = 4; int e = 5; int f = 6; int g = 7; int dp = 8; //设置阳极接口 int d4 = 9; int d3 = 10; int d2 = 11; int d1 = 12; //设置变量 long n = 1230; int x = 100; int del = 55; //此处数值对时钟进行微调 void setup() { pinMode(d1, OUTPUT); pinMode(d2, OUTPUT); pinMode(d3, OUTPUT); pinMode(d4, OUTPUT); pinMode(a, OUTPUT); pinMode(b, OUTPUT); pinMode(c, OUTPUT); pinMode(d, OUTPUT); pinMode(e, OUTPUT); pinMode(f, OUTPUT); pinMode(g, OUTPUT); pinMode(dp, OUTPUT); }/////////////////////////////////////////////////////////////void loop(){ Display(1, 1); Display(2, 2); Display(3, 3); Display(4, 4);}///////////////////////////////////////////////////////////////void WeiXuan(unsigned char n)//{ switch(n) { case 1: digitalWrite(d1,LOW); digitalWrite(d2, HIGH); digitalWrite(d3, HIGH); digitalWrite(d4, HIGH); break; case 2: digitalWrite(d1, HIGH); digitalWrite(d2, LOW); digitalWrite(d3, HIGH); digitalWrite(d4, HIGH); break; case 3: digitalWrite(d1,HIGH); digitalWrite(d2, HIGH); digitalWrite(d3, LOW); digitalWrite(d4, HIGH); break; case 4: digitalWrite(d1, HIGH); digitalWrite(d2, HIGH); digitalWrite(d3, HIGH); digitalWrite(d4, LOW); break; default : digitalWrite(d1, HIGH); digitalWrite(d2, HIGH); digitalWrite(d3, HIGH); digitalWrite(d4, HIGH); break; }}void Num_0(){ digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH); digitalWrite(g, LOW); digitalWrite(dp,LOW);}void Num_1(){ digitalWrite(a, LOW); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, LOW); digitalWrite(dp,LOW);}void Num_2(){ digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, LOW); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, LOW); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Num_3(){ digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Num_4(){ digitalWrite(a, LOW); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, HIGH); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Num_5(){ digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, LOW); digitalWrite(f, HIGH); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Num_6(){ digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Num_7(){ digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, LOW); digitalWrite(dp,LOW);}void Num_8(){ digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Num_9(){ digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, LOW); digitalWrite(f, HIGH); digitalWrite(g, HIGH); digitalWrite(dp,LOW);}void Clear() //清屏{ digitalWrite(a, LOW); digitalWrite(b, LOW); digitalWrite(c, LOW); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, LOW); digitalWrite(dp,LOW);}void pickNumber(unsigned char n)//选数{ switch(n) { case 0:Num_0(); break; case 1:Num_1(); break; case 2:Num_2(); break; case 3:Num_3(); break; case 4:Num_4(); break; case 5:Num_5(); break; case 6:Num_6(); break; case 7:Num_7(); break; case 8:Num_8(); break; case 9:Num_9(); break; default:Clear(); break; }}void Display(unsigned char x, unsigned char Number)//显示x为坐标，Number为数字{ WeiXuan(x); pickNumber(Number); delay(1); Clear() ; //消影}把下面代码复制下载到控制板中，看看效果图。

实验结果为数码管显示。