// This program is designed to control an LED connected to GPIO4 of the ESP32.
// The LED will blink on and off every second, and the status of the LED (ON or OFF) will be printed to the Serial Monitor.

// The setup function runs once when the ESP32 starts up or is reset.
void setup() {
  // Set the LED pin (GPIO4) as an output.
  pinMode(4, OUTPUT);

  // Start the Serial communication at a baud rate of 9600.
  // This allows us to print messages from the ESP32 to the Serial Monitor in the Arduino IDE.
  Serial.begin(9600);
}

// The loop function runs over and over again forever after the setup function has completed.
void loop() {
  // Turn the LED on (HIGH is the voltage level).
  digitalWrite(4, HIGH);

  // Print a message to the Serial Monitor indicating that the LED is on.
  Serial.println("LED is ON");

  // Wait for 1 second (1000 milliseconds).
  delay(1000);

  // Turn the LED off by making the voltage LOW.
  digitalWrite(4, LOW);

  // Print a message to the Serial Monitor indicating that the LED is off.
  Serial.println("LED is OFF");

  // Wait for 1 second (1000 milliseconds).
  delay(1000);
}