void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(18, INPUT);
}

void loop() {
  int buttonState = digitalRead(18);
  if(buttonState == 1) {
    Serial.println("Switch ON-----");
  }
  
  if(buttonState == 0) {
    Serial.println("Switch OFF----");
  }
  delay(10); // this speeds up the simulation
}