#define ledMerah 5
#define ledKuning 4
#define ledHijau 2

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

void loop() {
  // merah menyala 2 detik
  digitalWrite(ledMerah, HIGH);
  delay(2000);
  digitalWrite(ledKuning, LOW);
  digitalWrite(ledHijau, LOW);
  // kuning menyala 2 detik
  digitalWrite(ledMerah, LOW);
  digitalWrite(ledKuning, HIGH);
  delay(2000);
  digitalWrite(ledHijau, LOW);
  // hijau menyala 2 detik
  digitalWrite(ledMerah, LOW);
  digitalWrite(ledKuning, LOW);
  digitalWrite(ledHijau, HIGH);
  delay(2000);
  // led mati semua 1 detik
  digitalWrite(ledMerah, LOW);
  digitalWrite(ledKuning, LOW);
  digitalWrite(ledHijau, LOW);
  delay(1000);
}