1位数码管模拟值实验

所需的材料以及电路连接图

Arduino 板1个
USB下载数据线1根
面包板1个
杜邦线若干
1k 电阻 8 个
共阴极数码管1个

按照如下方式连接

了解共阴数码管

各个引脚的作用

将数码管的正面朝向我们，自上而下从左往右的引脚分别定义成 1~10，其中 3 号引脚和 8 号引脚都是公共端，用于接入电路中的阴极（也叫GND），数码管中共有8个发光二极管，分别表示成 a ~ h（h 为小数点），各个引脚所控制的发光二极管图中也标出来了：1 -> g
2 -> f
4 -> a
5 -> b
6 -> e
7 -> d
9 -> c
10 -> h

实验流程

这里采用 8 号引脚作为 GND连接端（3号引脚功能也是一样的），每个发光二极管的引脚均接入一个1k的电阻，防止电流过大烧毁二极管。
按照发光二极管从 a ~ h 的顺序分别接上arduino主板上的数字口 2 ~ 8和10。

实验代码

// 定义数码管各段对应的引脚（共阳极）// a:2, b:3, c:4, d:5, e:6, f:7, g:8, h(dp):9inta=2;intb=3;intc=4;intd=5;inte=6;intf=7;intg=8;inth=9;// 小数点dp// 新增：通用清零函数，切换数字前先熄灭所有段（电平已互换）voidclearDisplay(){digitalWrite(a,HIGH);digitalWrite(b,HIGH);digitalWrite(c,HIGH);digitalWrite(d,HIGH);digitalWrite(e,HIGH);digitalWrite(f,HIGH);digitalWrite(g,HIGH);digitalWrite(h,HIGH);}voidsetup(){// 设置2~9号引脚为输出模式for(inti=2;i<=9;i++){pinMode(i,OUTPUT);}// 初始化时先清零，避免上电乱码clearDisplay();}voidloop(){// 依次显示0-9，每个数字停留1秒（切换前先清零）clearDisplay();digital_0();delay(1000);clearDisplay();digital_1();delay(1000);clearDisplay();digital_2();delay(1000);clearDisplay();digital_3();delay(1000);clearDisplay();digital_4();delay(1000);clearDisplay();digital_5();delay(1000);clearDisplay();digital_6();delay(1000);clearDisplay();digital_7();delay(1000);clearDisplay();digital_8();delay(1000);clearDisplay();digital_9();delay(1000);}// 显示数字0（共阳极：亮=LOW，灭=HIGH，小数点灭）voiddigital_0(void){digitalWrite(a,LOW);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,LOW);digitalWrite(e,LOW);digitalWrite(f,LOW);digitalWrite(g,HIGH);// g段灭digitalWrite(h,HIGH);// 小数点灭}// 显示数字1voiddigital_1(void){digitalWrite(a,HIGH);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,HIGH);digitalWrite(e,HIGH);digitalWrite(f,HIGH);digitalWrite(g,HIGH);digitalWrite(h,HIGH);}// 显示数字2voiddigital_2(void){digitalWrite(a,LOW);digitalWrite(b,LOW);digitalWrite(c,HIGH);digitalWrite(d,LOW);digitalWrite(e,LOW);digitalWrite(f,HIGH);digitalWrite(g,LOW);digitalWrite(h,HIGH);}// 显示数字3voiddigital_3(void){digitalWrite(a,LOW);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,LOW);digitalWrite(e,HIGH);digitalWrite(f,HIGH);digitalWrite(g,LOW);digitalWrite(h,HIGH);}// 显示数字4voiddigital_4(void){digitalWrite(a,HIGH);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,HIGH);digitalWrite(e,HIGH);digitalWrite(f,LOW);digitalWrite(g,LOW);digitalWrite(h,HIGH);}// 显示数字5voiddigital_5(void){digitalWrite(a,LOW);digitalWrite(b,HIGH);digitalWrite(c,LOW);digitalWrite(d,LOW);digitalWrite(e,HIGH);digitalWrite(f,LOW);digitalWrite(g,LOW);digitalWrite(h,HIGH);}// 显示数字6voiddigital_6(void){digitalWrite(a,LOW);digitalWrite(b,HIGH);digitalWrite(c,LOW);digitalWrite(d,LOW);digitalWrite(e,LOW);digitalWrite(f,LOW);digitalWrite(g,LOW);digitalWrite(h,HIGH);}// 显示数字7voiddigital_7(void){digitalWrite(a,LOW);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,HIGH);digitalWrite(e,HIGH);digitalWrite(f,HIGH);digitalWrite(g,HIGH);digitalWrite(h,HIGH);}// 显示数字8voiddigital_8(void){digitalWrite(a,LOW);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,LOW);digitalWrite(e,LOW);digitalWrite(f,LOW);digitalWrite(g,LOW);digitalWrite(h,HIGH);}// 显示数字9voiddigital_9(void){digitalWrite(a,LOW);digitalWrite(b,LOW);digitalWrite(c,LOW);digitalWrite(d,LOW);digitalWrite(e,HIGH);digitalWrite(f,LOW);digitalWrite(g,LOW);digitalWrite(h,HIGH);}

最终所得结果（如下视频）

给arduino板通电以后，数码管会按照从 0 ~ 9 的顺序每隔1秒切换显示数字。