#include <Arduino.h>

const int ledMerah = 23;
const int ledBiru = 22;

void setup() {
  pinMode(ledMerah, OUTPUT);
  pinMode(ledBiru, OUTPUT);

}

void loop(){
  digitalWrite(ledMerah, HIGH);
  digitalWrite(ledBiru, LOW);
  delay(1500);

  digitalWrite(ledMerah, LOW);
  digitalWrite(ledBiru, HIGH);
  delay(1500);
}