效果代码：

#define t   30
#define t1  20
#define t2  100
#define t3  50

void setup() {
  // set up pins 2 to 13 as outputs
  for (int i = 2; i <= 13; i++) {
    pinMode(i, OUTPUT);
  }
}
/Effect 1
void loop()
{
 effect_1();
 effect_1();
 effect_2();
 effect_2();
 effect_3();
 effect_3();
 effect_4();
 effect_4();
 effect_5();
 effect_5();
 effect_6();
 effect_6();
 effect_7();
 effect_7();
  }
//左到右右到左
void effect_1()
{
for(int i=2; i<14; i++){
digitalWrite(i, HIGH);
delay(t1);
digitalWrite(i+1, HIGH);
delay(t1);
digitalWrite(i+2, HIGH);
delay(t1);
digitalWrite(i, LOW);
delay(t1);
digitalWrite(i+1, LOW);
delay(t1);
}
for(int i=13; i>1; i--){
digitalWrite(i, HIGH);
delay(t1);
digitalWrite(i-1, HIGH);
delay(t1);
digitalWrite(i-2, HIGH);
delay(t1);
digitalWrite(i, LOW);
delay(t1);
digitalWrite(i-1, LOW);
delay(t1);
}
}
/Effect 2
void effect_2()
{
int count = 13; // keeps track of second LED movement

  // 将第一个 LED 从左向右移动，第二个 LED 从右向左移动
  for (int i = 2; i < 13; i++) {
    clear();
    digitalWrite(i, HIGH);      // chaser 1
    digitalWrite(count, HIGH); // chaser 2
    count--;
    // 停止 LED ，静止在中间
    if (count != 7) {
      delay(t2);
    }
  }

  // 将第一个 LED 从右向左移动，将第二个 LED 从左向右移动
  for (int i = 13; i > 2; i--) {
    clear();
    digitalWrite(i, HIGH);      // chaser 1
    digitalWrite(count, HIGH); // chaser 2
    count++;
    // 停止 LED ，静止在中间
    if (count != 8) {
      delay(t2);
    }
  }
}

Effect 3

void effect_3()
{
for(int i=2; i<14; i++){
  digitalWrite(i, HIGH);
  delay(t3);
}
for(int i=2; i<14; i++){
  digitalWrite(i, LOW);
  delay(t3);
}

for(int i = 14; i>=2; i--){
  digitalWrite(i, HIGH);
  delay(t3);
}
for(int i = 14; i>=2; i--){
  digitalWrite(i, LOW);
  delay(t3);
}
}
  ///Effect 4
void effect_4()
{
for(int j = 2; j <= 13; j++){
  digitalWrite(j, HIGH);
  delay(t2);
  j=j+1;
  }
for(int j = 2; j <= 13; j++){
  digitalWrite(j, LOW);
  delay(t2);
  }

  for(int k = 15; k > 2; k--){
  digitalWrite(k, HIGH);
  delay(t2);
  k=k-1;
  }
for(int k = 15; k > 2; k--){
  digitalWrite(k, LOW);
  delay(t2);
  }
}
//Effect 5

void effect_5()

{

  clear();

  for (int i = 2; i < 13; i++) {

    for (int pin = 13; pin >= i; pin--)

    {

      digitalWrite(pin, HIGH);

      delay(t1);

      digitalWrite(pin + 1, LOW);

      delay(t1);

    }

  }

}

  /Effect 6
void effect_6()
{
for(int j=2; j<14; j++){
  digitalWrite(j, LOW);
  delay(t);
  digitalWrite(j, HIGH);
  delay(t);
  digitalWrite(j-2, LOW);
  delay(t);
  digitalWrite(j, HIGH);
}
for(int k = 15; k>2; k--){
  digitalWrite(k, LOW);
  delay(t);
  digitalWrite(k, HIGH);
  delay(t);
  digitalWrite(k+2, LOW);
  delay(t);
  digitalWrite(k, HIGH);
}
for(int k = 2; k<14; k++){
  digitalWrite(k, LOW);
  delay(t);
  digitalWrite(k, HIGH);
  delay(t);
  digitalWrite(k-2, LOW);
  delay(t);
  digitalWrite(k, HIGH);
}
for(int k = 15; k>2; k--){
  digitalWrite(k, LOW);
  delay(t);
  digitalWrite(k, HIGH);
  delay(t);
  digitalWrite(k+4, LOW);
  delay(t);
  digitalWrite(k, HIGH);
}
for(int k = 2; k<14; k++){
  digitalWrite(k, LOW);
  delay(t);
  digitalWrite(k, HIGH);
  delay(t);
  digitalWrite(k-4, LOW);
  delay(t);
  digitalWrite(k, HIGH);
} 
}
///Effect 7
void effect_7()
{
for(int j=2; j<14; j++){
  digitalWrite(j, HIGH);
  delay(t);
  digitalWrite(j+2, LOW);
  delay(t);
}
for(int k = 15; k>2; k--){
  digitalWrite(k, HIGH);
  delay(t);
  digitalWrite(k+2, LOW);
  delay(t);
}
}

// function to switch all LEDs off
void clear(void)
{
  for (int i = 2; i <= 13; i++) {
    digitalWrite(i, LOW);
  }
}