const byte relayPin      =  7; 
const byte onBoardLEDPin = 13; 

void setup() {
  Serial.begin(115200);
  Serial.println("setup-Start");
  pinMode(relayPin,      OUTPUT); 
  pinMode(onBoardLEDPin, OUTPUT); 
}

void loop() {
  Serial.println("Top of Loop");
  digitalWrite(relayPin, HIGH); // Turn on the relay
  digitalWrite(onBoardLEDPin, HIGH); // Turn on the relay
  Serial.println("relay and onboard LED HIGH");
  delay(2000); // Wait for 2 seconds

  digitalWrite(relayPin, LOW); // Turn off the relay
  digitalWrite(onBoardLEDPin, LOW); // Turn on the relay
  Serial.println("relay and onboard LED LOW");
  delay(2000); // Wait for 2 seconds
}