// 廣域變數(到處可用)
int LED[8] = {15, 16, 17, 18, 19, 21, 22, 23};  // 宣告一個整數陣列，名稱為LED，內容物共8筆

void setup() {
  // 宣告輸出腳
  for(int i=0; i<=7; i++)
  {
    pinMode(LED[i], OUTPUT);  // 宣告LED[0]~LED[7]其對應的接腳為輸出腳
  }

//all_on();   //全亮  
  all_on();
  delay(800);
  all_off();  //全滅
  delay(800);
  //all_on();   //全亮  
  all_on();
  delay(800);
  all_off();  //全滅
  delay(800);
}

void loop() {
  left_to_right(200, 30);   // 左快去，右慢回
  right_to_left(200, 30);  // 右慢去，左快回
  all_on();   //全亮
  all_off();  //全滅
  all_on();   //全亮
  all_off();  //全滅
  all_on();   //全亮
  all_off();  //全滅
  two_led_left_right(200,20);
  two_led_right_left(200,20);
  all_off();  //全滅
}

// 全滅
void all_off()
{
  for(int i=0; i<=7; i++)
  {
    digitalWrite(LED[i], 1);  // 令LED[0]~LED[7]其對應的接腳為HIGH
  }
}

// 全亮
void all_on()
{
  for(int i=0; i<=7; i++)
  {
    digitalWrite(LED[i], 0);  // 令LED[0]~LED[7]其對應的接腳為LOW
  }
}

// 亮某幾個燈
void led_on(int x, int y)     // 帶參數
{
  for(int i=x; i<=y; i++)
  {
    digitalWrite(LED[i], 0);  // 令LED[0]~LED[7]其對應的接腳為LOW
    Serial.print(x);
    Serial.print(",");
    Serial.println(y);

  }  
}

//三個led連在一起左去右回
void two_led_left_right(int x, int y)
{
  for (int i = 0; i <= 5; i++)
  {

    digitalWrite(LED[i], 0);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] + 1, 0);
    delay(x);
    digitalWrite(LED[i], 1);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] + 1, 1);
    delay(y);

  }
  for (int i = 7; i >= 0; i--)
  {

    digitalWrite(LED[i], 0);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] - 1, 0);
    delay(x);
    digitalWrite(LED[i], 1);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] - 1, 1);
    delay(y);

  }
}
//三個led連在一起右去左回
void two_led_right_left(int x, int y)
{
  for (int i = 7; i >= 0; i--)
  {

    digitalWrite(LED[i], 0);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] - 1, 0);
    delay(x);
    digitalWrite(LED[i], 1);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] - 1, 1);
    delay(y);

  }
  for (int i = 0; i <= 5; i++)
  {

    digitalWrite(LED[i], 0);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] + 1, 0);
    delay(x);
    digitalWrite(LED[i], 1);  // 令LED[0]~LED[7]其對應的接腳為LOW
    digitalWrite(LED[i] + 1, 1);
    delay(y);

  }
}
// 由左到右，流水燈
void left_to_right(int t1, int t2)    // 帶參數 t1, t2
{
  for (int i = 7; i >= 0; i--)
  {
    digitalWrite(LED[i], 0);
    delay(t1);
    digitalWrite(LED[i], 1);
    delay(t2);
  }
  for (int i = 0; i <= 7; i++)
  {
    digitalWrite(LED[i], 0);
    delay(t1);
    digitalWrite(LED[i], 1);
    delay(t2);
  }
}
// 由右到左，流水燈
void right_to_left(int t1, int t2)    // 帶參數 t1, t2
{
  for (int i = 0; i <= 7; i++)
  {
    digitalWrite(LED[i], 0);
    delay(t1);
    digitalWrite(LED[i], 1);
    delay(t2);
  }
  for (int i = 7; i >= 0; i--)
  {
    digitalWrite(LED[i], 0);
    delay(t1);
    digitalWrite(LED[i], 1);
    delay(t2);
  }
}