void setup() {
  /*
  Program lampu kelap-kelip
  dibuat oleh Evan
  *2023*
  */

#define LED1 13
#define LED2 12

pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
}

void loop() {
digitalWrite(LED1, HIGH);
digitalWrite(LED2, LOW);
delay(500);
digitalWrite(LED1, LOW);
digitalWrite(LED2, HIGH);
delay(500);
}