int led8 = 8;
int led9 = 9;

void setup() {
  pinMode(led8, OUTPUT);
  pinMode(led9, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(led8, HIGH);
  Serial.println("led Biru menyala selama 1 detik");
  delay(1000);
  digitalWrite(led9, HIGH);
  Serial.println("led Merah menyala selama 1 detik");
  delay(0);

  digitalWrite(led8, LOW);
  Serial.println("led Biru mati selama 1 detik");
  delay(1000);
   digitalWrite(led9, LOW);
  Serial.println("led Merah mati selama 1 detik");
  delay(0);

}