int ledPin = 25; // GPIO25
// GPIO stands for "General Purpose Input/Output"
// it's how microcontrollers like the ESP32 interact with the outside world.
void setup() {
  pinMode(ledPin, OUTPUT);       // Set GPIO2 as output
  Serial.begin(115200);          // Start serial communication
  Serial.println("Hello ESP32"); 
}

void loop() {
  digitalWrite(ledPin, HIGH);    // LED ON
  delay(2000);                   
  digitalWrite(ledPin, LOW);     // LED OFF
  delay(1000);                  

  Serial.println("Hello ESP32"); // Print every cycle
}