#define RELAY_PIN 25   // Relay control pin

void setup() {
  pinMode(RELAY_PIN, OUTPUT);
  Serial.begin(115200);           // Initialize Serial Monitor
  Serial.println("Relay LED Control Started");
}

void loop() {

  digitalWrite(RELAY_PIN, HIGH);  // Relay ON → LED ON
  Serial.println("LIGHT ON(4 sec)");
  delay(4000);

  digitalWrite(RELAY_PIN, LOW);   // Relay OFF → LED OFF
  Serial.println("LIGHT OFF(2 sec)");
  delay(2000);
}