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); // Turn On the LED
  if(digitalRead(Relay)==1)
  { Serial.println("LED ON");}
  delay(500); // this speeds up the simulation
  digitalWrite(Relay, LOW);  // Turn Off the LED
  if(digitalRead(Relay)==0)
  { Serial.println("LED OFF");}
  delay(500);
}