#include <Servo.h>

// define pins
const int LED_PIN = 13; // onboard LED
const int SERVO_PIN = 9; // servo signal pin
const int BUTTON_PIN = 2; // pushbutton input pin
const int RELAY_PIN = 10; // relay output pin

// create servo object
Servo myservo;

// define servo angle values
const int SERVO_CLOSED_ANGLE = 0;
const int SERVO_OPEN_ANGLE = 90;

// define button state variables
int buttonState = 0;
int lastButtonState = 0;

void setup() {
  // initialize digital pins as inputs or outputs
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);

  // attach servo to pin
  myservo.attach(SERVO_PIN);

  // set initial servo position
  myservo.write(SERVO_CLOSED_ANGLE);
}

void loop() {
  // read button state
  buttonState = digitalRead(BUTTON_PIN);

  // if button state has changed, toggle relay output and servo position
  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      digitalWrite(RELAY_PIN, HIGH);
      myservo.write(SERVO_OPEN_ANGLE);
    } else {
      digitalWrite(RELAY_PIN, LOW);
      myservo.write(SERVO_CLOSED_ANGLE);
    }
  }

  // update last button state
  lastButtonState = buttonState;

  // blink onboard LED
  digitalWrite(LED_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  delay(500);
}