void setup() {
  // mulai memprogram (//hanya komentar bukan program)
pinMode(13, OUTPUT); //menentukan pin LED pada port 13
pinMode(7, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(13,HIGH);
digitalWrite(7,LOW);
delay(1000);
digitalWrite(13,LOW);
digitalWrite(7,HIGH);
delay(1000);
}