const int button = 27;//declaration of the "button" constant
 void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(button, INPUT);
  pinMode(26, OUTPUT);//Led
  pinMode(0, OUTPUT);//Led
  pinMode(1, OUTPUT);//Led
 
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
 void loop() {
  int statebutton = digitalRead(button);//read whether the knob is in the open or closed position

  if (statebutton == LOW) {//is used to set a condition
  digitalWrite(26, HIGH);  // turn the LED on (HIGH is the voltage level)
  digitalWrite(0, HIGH);  // turn the LED on (HIGH is the voltage level)
  digitalWrite(1, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(100);//action execution time (in milliseconds)
  } else{//is used to set a condition
  digitalWrite(26, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(0, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(1, LOW);   // turn the LED off by making the voltage LOW
  Serial.println(statebutton);//displays in the Arduino monitor whether the button is in the open or closed position
  delay(100);//action execution time (in milliseconds)
  }
}