const int led = 3;
const int btn = 5;
int buttonstatus = 0;

void setup() {
pinMode(led,OUTPUT); 
pinMode(btn, INPUT);
Serial.begin(9600);
}

void loop() {
 buttonstatus = digitalRead(btn);
 if (buttonstatus == HIGH){
   digitalWrite(led,HIGH);
   Serial.println("LED ON");
  } else {
    digitalWrite(led,LOW);
    Serial.println("LED OFF");
   }
   delay(1000);
 }