所需的零件：
Arduino UNO
220Ω电阻
7段数码管
跳线
面包板

如图所示，7段LED被放置在面包板上。这里我们将添加220Ω电阻。顶行和底行中间引脚是一个公共引脚。我们需要将此引脚连接到电阻器支路。

连接的剩余引脚如下：
TOP引脚（从左侧）第一个引脚到数字引脚8
第二个引脚到数字引脚9
第三个引脚连接到电阻器
第四个引脚到数字引脚7
第五个引脚到数字引脚6
底针（从左侧）

第一个引脚到数字引脚10
第二个引脚到数字引脚11
第三个引脚连接到电阻器
第四个引脚到数字引脚12
第五个引脚到数字引脚3
接下来可以编代码了。

代码：
int c = 12;

int d = 11;

int e = 10;

int g = 9;

int f = 8;

int a = 7;

int b = 6;

int chrono = 1000;

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(c, LOW);

digitalWrite(d, HIGH);

digitalWrite(e, HIGH);

digitalWrite(g, HIGH);

digitalWrite(f, HIGH);

digitalWrite(a, HIGH);

digitalWrite(b, LOW); }

void two(){

digitalWrite(c, HIGH);

digitalWrite(d, LOW);

digitalWrite(e, LOW);

digitalWrite(g, LOW);

digitalWrite(f, HIGH);

digitalWrite(a, LOW);

digitalWrite(b, LOW); }

void three(){

digitalWrite(c, LOW);

digitalWrite(d, LOW)

; digitalWrite(e, HIGH);

digitalWrite(g, LOW);

digitalWrite(f, HIGH);

digitalWrite(a, LOW);

digitalWrite(b, LOW); }

void four(){

digitalWrite(c, LOW);

digitalWrite(d, HIGH);

digitalWrite(e, HIGH);

digitalWrite(g, LOW);

digitalWrite(f, LOW);

digitalWrite(a, HIGH);

digitalWrite(b, 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(c, LOW);

digitalWrite(d, LOW);

digitalWrite(e, LOW);

digitalWrite(g, LOW);

digitalWrite(f, LOW);

digitalWrite(a, LOW);

digitalWrite(b, LOW); }

void nine(){

digitalWrite(a, LOW);

digitalWrite(b, LOW);

digitalWrite(c, LOW);

digitalWrite(d, LO