const int ledpin = 2;
const int btnpin = 4;
int btnState = 0;

void setup() {

  Serial.begin(9600);
  pinMode(btnpin, INPUT);
  pinMode(ledpin,OUTPUT);

}

void loop() {

  //read
  btnState = digitalRead(btnpin);

  if(btnState == HIGH){

    digitalWrite(ledpin, HIGH);
    Serial.println("LED is ON!");
    //delay(5000);

  }

  else{

    digitalWrite(ledpin, LOW);
    Serial.println("LED is OFF!");

  }

  delay(500);

}