#define LED_pin 16
#define button_pin 18
int button_state=0;
void setup()
{
  pinMode(16, OUTPUT);
  pinMode(18, INPUT);
  Serial.begin(115200);
}
void loop()
{
  button_state =digitalRead(button_pin);
  if(button_state==LOW)
  {
    digitalWrite(LED_pin, HIGH);
    Serial.println("LED on");
  }
  else
  {
    digitalWrite(LED_pin, LOW);
    Serial.println("LED OFF");
  }
}