#define INTERNAL_LED_PIN 2

void setup() {
  
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(INTERNAL_LED_PIN, OUTPUT); // Set the LED pin as an output
}

void loop() {
  // put your main code here, to run repeatedly:
    digitalWrite(INTERNAL_LED_PIN, HIGH); // Turn on the LED
    delay(2000);
    digitalWrite(INTERNAL_LED_PIN, LOW); // Turn on the LED
    delay(2000);
}