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

  #define col 8
  #define led 6
  int colPins[8] = {12,13, 14, 15,16,17, 18, 19};
  int ledPins[6] = {25, 26, 27, 32, 4, 5};

  //pinMode(colPins[0], OUTPUT);  
  //digitalWrite(colPins[0], LOW);

  for (int n = 0; n < col; n++) {
    pinMode(colPins[n], OUTPUT);
  }

  for (int n = 0; n < led; n++) {
    pinMode(ledPins[n], OUTPUT);  
  }

  for (int n = 0; n < col; n++) {
    digitalWrite(colPins[n], LOW);
  }

  for (int n = 0; n < led; n++) {
    digitalWrite(ledPins[n], HIGH);
  }

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}