const int lampu1 = 2;
const int lampu2 = 4;
const int saklar1 = 13;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(lampu1, OUTPUT);
  pinMode(lampu2, OUTPUT);
  pinMode(saklar1, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(saklar1) == LOW) {
    digitalWrite(lampu1, LOW);
    digitalWrite(lampu2, HIGH);
    delay(1000);
    digitalWrite(lampu2, LOW);
    delay(1000);
} else {
    digitalWrite(lampu1, HIGH);
    digitalWrite(lampu2, LOW);
    delay(1000);
    digitalWrite(lampu1, LOW);
    delay(1000);
}
}