void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(33, OUTPUT);
  pinMode(25, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(21, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(17, OUTPUT);
  Serial.println(("Hello, ESP32!"));
}

void loop() {
  digitalWrite(33, HIGH);
  digitalWrite(21, HIGH);
  delay(2000);
  digitalWrite(33, LOW);
  digitalWrite(21, LOW);
  digitalWrite(25, HIGH);
  digitalWrite(15, HIGH);
  delay(2000);
  digitalWrite(25, LOW);
  digitalWrite(15, LOW);
  digitalWrite(12, HIGH);
  digitalWrite(17, HIGH);
  delay(2000);
  digitalWrite(12, LOW);
  digitalWrite(17, LOW);
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation:
}