#define RELAY1 7
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(RELAY1, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(RELAY1, 0);   //Turns ON Relays 1
  Serial.println("Light ON");
  delay(1000);               //Wait 1 seconds
  digitalWrite(RELAY1, 1);     //Turns Relay off
  Serial.println("Light OFF");
  delay(1000);
}