#include <Servo.h>

Servo ElevatorServo;
int pos = 0;

const int buttonPin = 9;
const int servoPin = 3;

int currentFloor = 0;
int buttonPushCounter = 0;
int buttonState = 0;
int lastButtonState = 0;

void setup() {
  ElevatorServo.attach(9);
  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      buttonPushCounter++;
      Serial.println("on");
      Serial.print("number of button pushes: ");
      Serial.println(buttonPushCounter);
    } else {
      Serial.println("off");
    }
  delay(1);
  }
  
  lastButtonState = buttonState;

  if (buttonPushCounter % 2 == 0) {
    for (pos = 0; pos <= 180; pos += 1) {
      ElevatorServo.write(pos);
      delay(15);
    }
  } else if (buttonPushCounter % 2 == 1) {
    for (pos = 180; pos >= 0; pos -= 1) {
      ElevatorServo.write(pos);
      delay(15);
    }
  }

}