int led[18]={15, 2, 0, 4, 16, 17, 5, 18, 19, 21, 22, 23, 32, 33, 25, 26, 27, 14};

void setup() {
  // put your setup code here, to run once:
  pinMode(led[0],OUTPUT);
  pinMode(led[1],OUTPUT);
  pinMode(led[2],OUTPUT);
  pinMode(led[3],OUTPUT);
  pinMode(led[4],OUTPUT);
  pinMode(led[5],OUTPUT);
  pinMode(led[6],OUTPUT);
  pinMode(led[7],OUTPUT);
  pinMode(led[8],OUTPUT);
  pinMode(led[9],OUTPUT);
  pinMode(led[10],OUTPUT);
  pinMode(led[11],OUTPUT);
  pinMode(led[12],OUTPUT);
  pinMode(led[13],OUTPUT);
  pinMode(led[14],OUTPUT);
  pinMode(led[15],OUTPUT);
  pinMode(led[16],OUTPUT);
  pinMode(led[17],OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  for(int y=-1;y<18;y++){
    digitalWrite(led[y],HIGH);
    delay(50);
  }
  for(int x=18;x>-1;x--){
    digitalWrite(led[x],LOW);
    delay(50);
  }
  delay(50);
}