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//Port 13 +
//resistance(电阻)
//Led(辨别LED灯正负极:1.长脚是正极，短脚是负极;2.发光二极管管体内部金属极较小的是正极，大的片状的是负极)
//Port GND -
int ledPin = 13;
void setup()
{
  pinMode(ledPin,OUTPUT);
}

void loop()
{
  digitalWrite(ledPin,HIGH);
  delay(1000);
  digitalWrite(ledPin,LOW);
  delay(1000);
}