const int relayPin = 23; // GPIO pin connected to the relay
const int ledPin = 22;   // GPIO pin connected to the common terminal of the relay

void setup() {
  pinMode(relayPin, OUTPUT); // Set relay pin as output
  pinMode(ledPin, OUTPUT);   // Set LED pin as output
  digitalWrite(relayPin, LOW); // Ensure relay is off at startup
  digitalWrite(ledPin, LOW);   // Ensure LED is off at startup
}

void loop() {
  // Turn the relay on (which will turn the LED on)
  digitalWrite(relayPin, HIGH);
  digitalWrite(ledPin, HIGH);
  delay(1000); // Keep the relay on for 1 second

  // Turn the relay off (which will turn the LED off)
  digitalWrite(relayPin, LOW);
  digitalWrite(ledPin, LOW);
  delay(1000); // Keep the relay off for 1 second
}