int LED = 13;
int BUTTON = 8;
int val;

void setup()
{
  // put your setup code here, to run once:
   pinMode(LED,OUTPUT);
   pinMode(BUTTON,INPUT);
}
void loop()
{
  // put your main code here, to run repeatedly:
    val = digitalRead(BUTTON);
    if(val == 0)//如果監(jiān)測到障礙物
    {
        digitalWrite(LED,LOW);//點(diǎn)亮板載LED
        delay(1000);
    }
    else
    {
        digitalWrite(LED,HIGH);//否則熄滅
        delay(10);
    }
}