int LEDState = LOW;

int LEDPin = 6;

int buttonPin = 12;
int buttonNew;
int buttonOld = 1;    // input_pullup are normaly high

int buzzerPin = 7;
int i;

int buzzerState = 0;

void setup() {

  Serial.begin(9600);
  pinMode(buzzerPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  buttonNew = digitalRead(buttonPin);
  Serial.println(buttonNew);

  delay(30); // loop throttle / lazy or poor man's debounce

  if ((buttonOld == 1) && (buttonNew == 0)) {
    if (buzzerState == 0) {
      digitalWrite(13, HIGH);
      tone(buzzerPin, 440);
      delay(90);
      buzzerState = 1;
    }
    else {
      digitalWrite(13, LOW);
      buzzerState = 0;
      noTone(buzzerPin);
    }
  }

  buttonOld = buttonNew;
}