const int BUTTON_PIN = 27;     // the number of the pushbutton pin
const int VACUUM_PIN =  26;      // the number of the pump pin (28 for pump, 26 for LED)

int buttonState = 0;         // variable for reading the pushbutton status
bool lastButtonState = LOW;
bool pumpState = LOW;

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {
  pinMode(VACUUM_PIN, OUTPUT);      // pump is defined as output
  pinMode(BUTTON_PIN, INPUT);    // pushbutton is defined as input
  Serial.begin(9600);
}

void loop() {
  // read button status
  int reading = digitalRead(BUTTON_PIN);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce delay,
    // so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the pump if the new button state is HIGH (pressed)
      if (buttonState == HIGH) {
        pumpState = !pumpState;
        digitalWrite(VACUUM_PIN, pumpState);
      }
    }
  }

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}