Servo myservo;
int buttonPin = D0;
int servoPin = A4;

int initial_position = 180;
int final_position = 120;
int buttonState;


void setup()
{
  Serial.begin(9600);
  // Setup pins
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(servoPin, OUTPUT);

  // Setup Servo to initial position
  myservo.attach(servoPin);
  myservo.write(initial_position); // Initial
  delay(500);
  myservo.detach();
}


void loop()
{
  // Read button
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH)
  {
    Particle.publish("tag_dispensed", "HIGH");
    myservo.attach(servoPin);
    myservo.write(final_position);
    delay(5000);
    myservo.write(initial_position);
    Particle.publish("tag_dispensed", "LOW");
    // Do something
  }
}