void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  for (int i=15; i<=23; i++){
    pinMode(i, OUTPUT);
  }

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  digitalWrite(23, 1);
  digitalWrite(15, 1);
  delay(1000);
  digitalWrite(23, LOW);
  digitalWrite(15, LOW);
  delay(1000);
  digitalWrite(22, 1);
  digitalWrite(16, 1);
  delay(1000);
  digitalWrite(22, LOW);
  digitalWrite(16, LOW);
  delay(1000);
  digitalWrite(21, 1);
  digitalWrite(17, 1);
  delay(1000);
  digitalWrite(21, LOW);
  digitalWrite(17, LOW);
  delay(1000);
  digitalWrite(19, 1);
  digitalWrite(18, 1);
  delay(1000);
  digitalWrite(19, LOW);
  digitalWrite(18, LOW);
  delay(1000);
  digitalWrite(21, 1);
  digitalWrite(17, 1);
  delay(1000);
  digitalWrite(21, LOW);
  digitalWrite(17, LOW);
  delay(1000);
  digitalWrite(22, 1);
  digitalWrite(16, 1);
  delay(1000);
  digitalWrite(22, LOW);
  digitalWrite(16, LOW);
  delay(1000);
  digitalWrite(23, 1);
  digitalWrite(15, 1);
  delay(1000);
  digitalWrite(23, LOW);
  digitalWrite(15, LOW);
  delay(1000);
}