#define LED 13
#define PB0 2

void setup() {
  pinMode(LED,OUTPUT);
  digitalWrite(LED,HIGH);
  pinMode(PB0,INPUT);
}

void loop() {
  unsigned long x,y,x2;
  int z;
  z=0;
  if(digitalRead(PB0)==LOW){
    x=millis();
    while(digitalRead(PB0)==LOW){ //長按
      y=millis();
      if(y-x>2000) {//按下超過 2 秒
        z=1;
        break;
      }
    }
    if(z==1) digitalWrite(LED,LOW);
  }
  delay(100);//防彈跳
  if(digitalRead(PB0)==LOW){ //第二次按
    x2=millis();
    delay(100);//防彈跳
    if(x2-x<1000) //1秒內連按
      digitalWrite(LED,HIGH);
  }
}