int latchPin = 8;
int clockPin = 12;
int dataPin = 11; //这里定义了那三个脚

unsigned char table[] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};

void setup ()
{
  pinMode(latchPin,OUTPUT);
  pinMode(clockPin,OUTPUT);
  pinMode(dataPin,OUTPUT); //让三个脚都是输出状态
}
void loop()
{
  for(int i=0; i<8; i++)
  {
    digitalWrite(latchPin,LOW); //将ST_CP口上面加低电平让芯片准备好接收数据
    shiftOut(dataPin,clockPin,MSBFIRST,table[i]);
    digitalWrite(latchPin,HIGH); //将ST_CP这个针脚恢复到高电平
    delay(500); 
  }
}