int btn=2;
int btnState;
int led=6;

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

void loop() {
  btnState=digitalRead(btn);
  Serial.print("Button is= ");
  Serial.println(btnState);

  if(btnState==HIGH){
    digitalWrite(led, HIGH);
  }
  else{
    digitalWrite(led,LOW);
  }
  delay(100);
}