int lampu1 = 19;
int lampu2 = 18;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  pinMode(lampu1, OUTPUT);
  digitalWrite(lampu1, HIGH);
  delay(100);
  digitalWrite(lampu1, LOW);
  delay(100);

  pinMode(lampu2, OUTPUT);
  digitalWrite(lampu2, HIGH);
  delay(100);
  digitalWrite(lampu2, LOW);
  delay(100);
}