#define button 19
#define led 18


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

void loop() {
  // put your main code here, to run repeatedly:

  if (digitalRead(button) == LOW) {
    digitalWrite(led, HIGH);
    Serial.println("ON");
  }
  else
  {
    digitalWrite(led, LOW);
    Serial.println("OFF");
  }
}