// Relay Control
const int relayPin = 2;  // Digital output pin 2

void setup() {
  pinMode(relayPin, OUTPUT);  // Set relay pin as output
}

void loop() {
  digitalWrite(relayPin, HIGH);  // Turn on the relay
  delay(2000);  // Wait for 2 seconds
  digitalWrite(relayPin, LOW);  // Turn off the relay
  delay(2000);  // Wait for 2 seconds
}