int led = 13;
int buttonPin = 3;
int buttonState = 0;
void setup() {
  pinMode(led, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
    buttonState = digitalRead(buttonPin);
  if (buttonState == 1) {
  digitalWrite(led, LOW);
  Serial.println("led off");
  delay(1000);
  } else {
  digitalWrite(led, HIGH);
  Serial.println("led on");
  delay(1000);
  }
}