#define RELAY_PIN 16 // ESP32 pin 16 connected to the IN pin of relay

// the setup function runs once when you press reset or power the board
void setup() {
  Serial.begin(9600);

  // initialize digital pin as an output.
  pinMode(RELAY_PIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  Serial.println("The LED is turned on");
  digitalWrite(RELAY_PIN, HIGH);
  delay(2000);

  Serial.println("The LED is turned off");
  digitalWrite(RELAY_PIN, LOW);
  delay(2000);
}