int RELAY=4;

void setup()
{
  Serial.begin(9600);
  Serial.println("Hello Christ");

  pinMode(RELAY, OUTPUT);
}

void loop(){
   // put your main code here, to run repeatedly:
  digitalWrite(RELAY, HIGH);
  if (digitalRead(RELAY) == 1) {
    Serial.println("LED: ON");
  }
  delay(500);
  digitalWrite(RELAY, LOW);
  if (digitalRead(RELAY) == 0) {
    Serial.println("LED: OFF");
  }
  delay(500); // this speeds up the simulation
}