Making Arduino + Coin Sensor Project for Vending Machine

boolean buttonPressed = false;
int count = 0;
int totalCount = 0;
int cents = 0;

void setup() {
  Serial.begin(19200);
  attachInterrupt(digitalPinToInterrupt(2), buttonCB, FALLING);
  attachInterrupt(digitalPinToInterrupt(3), coinAcceptorCB, FALLING);
  pinMode(4, OUTPUT);
}


void buttonCB() {
  Serial.println("Button pressed");
  buttonPressed = true;
}

void coinAcceptorCB() {
  count = count + 1;
  cents = 10 * count;
  Serial.print("Count = ");
  Serial.println(count);
  Serial.print(cents);
  Serial.println(" cents received. ");

}

void loop() {
  if (buttonPressed) {
    if (5 <= totalCount && totalCount < 10) {
//      DISPENSE WATER
      digitalWrite(4, HIGH);
      delay(5000);
      digitalWrite(4, LOW);
      buttonPressed = false;  
//      SHOW RECEIPT
      Serial.print("Total count: ");
      Serial.println(totalCount);
      totalCount = 0;
    } else {
      Serial.println("Insufficient. Minimum is 50 Cents.");
      buttonPressed = false;
    }
  }

  delay(1000);
  totalCount = totalCount + count;
  count = 0;
}