int Relay=4;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9500);
  Serial.println("Hello,2347131 VISHNU");
  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
}