#define LED 12
#define GROUND 13


void setup() {
  // put your setup code here, to run once:
  //Serial.begin(9600);
  //Serial.println("Hello, ESP32!");
  pinMode(LED, OUTPUT);
  pinMode(GROUND, OUTPUT);

  //Using another pin as ground instead of the GND pin. 
  digitalWrite(GROUND, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED, HIGH);
  delay(1000);
  digitalWrite(LED, LOW);
  delay(1000);


}