void setup() {
  // ARDUINO UNO_LAMPU BERKEDIP DOUBLE
 // PEMBUAT ANDIKA BAYU PRASETYA_X TJKT 1
#define LED1 13 
#define LED2 12 
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
}

void loop() {
 
digitalWrite(13, HIGH);
digitalWrite(12, LOW);
delay(1000);
digitalWrite(13, LOW);
digitalWrite(12, HIGH);
delay(1000);
}