程式碼很簡單的

//將四顆LED灯的正極分別插在PIN10~13，為了以後程式碼好管理，我們都會為它們設定變化名稱來代表

int red_led = 10;

int yellow_led = 11;

int green_led = 12;

int blue_led = 13;

//在程式初始設定這兒，設定四個PIN的模式都是輸出

void setup()

{

  pinMode(red_led, OUTPUT);

  pinMode(yellow_led, OUTPUT);

  pinMode(green_led, OUTPUT);

  pinMode(blue_led, OUTPUT);

}

//程式循環

void loop()

{     //依序點亮四顆LED

  digitalWrite(red_led, HIGH);

  delay(100); 

  digitalWrite(yellow_led, HIGH);

  delay(100);

  digitalWrite(green_led, HIGH);

  delay(100);

  digitalWrite(blue_led, HIGH);

  delay(100);

//依序讓LED滅了

  digitalWrite(red_led, LOW);

  delay(100); 

  digitalWrite(yellow_led, LOW);

  delay(100);

  digitalWrite(green_led, LOW);

  delay(100);

  digitalWrite(blue_led, LOW);

  delay(100);

}