int led=8;
int swt=9;
void setup() {
  pinMode(led, OUTPUT);
  pinMode(swt, INPUT_PULLUP);
  Serial.begin(9600);

}

void loop() {
  int sts=digitalRead(swt);
  Serial.println(sts);
  if (sts==HIGH)
  {
    digitalWrite(led, LOW);
    Serial.println("led off");
  }
  else{
    digitalWrite(led, HIGH);
    Serial.println("led on");
  }
}