倒數計時9~0

材料：Arduino主板一個、雙公頭杜邦線10條、麵包板一個、七段顯示器一個。

效用：利用七段顯示器重複顯示從9~0的倒數。

應用：籃球比賽時所使用的倒數計時器。

電路接法：

程式碼：
void setup(){
   pinMode(2,OUTPUT);
   pinMode(3,OUTPUT);
   pinMode(4,OUTPUT);
   pinMode(5,OUTPUT);
   pinMode(6,OUTPUT);
   pinMode(7,OUTPUT);
   pinMode(8,OUTPUT);
   pinMode(9,OUTPUT);
   digitalWrite(9,0);
}
  void loop(){
  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,0);
  digitalWrite(6,0);
  digitalWrite(7,1);
  digitalWrite(8,1);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,1);
  digitalWrite(6,1);
  digitalWrite(7,1);
  digitalWrite(8,1);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,0);
  digitalWrite(6,0);
  digitalWrite(7,0);
  digitalWrite(8,0);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,0);
  digitalWrite(4,1);
  digitalWrite(5,1);
  digitalWrite(6,1);
  digitalWrite(7,1);
  digitalWrite(8,1);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,0);
  digitalWrite(4,1);
  digitalWrite(5,1);
  digitalWrite(6,0);
  digitalWrite(7,1);
  digitalWrite(8,1);
  delay(1000);

  digitalWrite(2,0);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,0);
  digitalWrite(6,0);
  digitalWrite(7,1);
  digitalWrite(8,1);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,1);
  digitalWrite(6,0);
  digitalWrite(7,0);
  digitalWrite(8,1);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,0);
  digitalWrite(5,1);
  digitalWrite(6,1);
  digitalWrite(7,0);
  digitalWrite(8,1);
  delay(1000);
 
  digitalWrite(2,0);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,0);
  digitalWrite(6,0);
  digitalWrite(7,0);
  digitalWrite(8,0);
  delay(1000);

  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,1);
  digitalWrite(5,1);
  digitalWrite(6,1);
  digitalWrite(7,1);
  digitalWrite(8,0);
  delay(4000);
  }