防彈跳 按一下亮，按一下off

 boolean btn_state;

boolean led_state = HIGH;

void setup()

{

  pinMode(13, OUTPUT);

  digitalWrite(13, led_state);

  pinMode(2, INPUT);

}

void loop()

{

  btn_state=digitalRead(2);

 if(btn_state==LOW)

 {

  led_state=!led_state;

  digitalWrite(13,led_state);

  delay(20);

  while(1)

  {

    btn_state=digitalRead(2);

    if(btn_state==HIGH)

    {

      break;

    }

  }

   delay(20); 

 }

}