// Define the pin connected to the relay module
const int relayPin = 7; // Pin connected to IN on relay module

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

void loop() {
  // Turn the relay on (connects COM to NO)
  digitalWrite(relayPin, HIGH);
  delay(1000); // Wait for 1 second

  // Turn the relay off (disconnects COM from NO)
  digitalWrite(relayPin, LOW);
  delay(1000); // Wait for 1 second
}