const int led_1 = 19;
const int led_2 = 4;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(led_1, OUTPUT);
  pinMode(led_2, OUTPUT);
}

void loop() {
  digitalWrite(led_1, HIGH);
  digitalWrite(led_2, HIGH);
  delay(2000);
  digitalWrite(led_1, LOW);
  delay(5000);
  digitalWrite(led_2, LOW);
  delay(3000);
}