Arduino scuola

#include <Servo.h>
Servo myservo;

int OutButtonState = 1;
int LastOutButtonState = 1;

int crossingtime = 2000;
int ButtonState = 1;
int STATE = 0;
int InButtonstate = 1;
int lastInButtonState = 1;



float time = 0;
float time_old = 0;
float delta_time = 0;



int pos = 0;
int pushButtonIn = 2;
int pushButtonOut = 3;
int Lightgreen = 4;
int LightRed = 5;
int Buzzer = 6;


void setup()
{
myservo.attach(10);
Serial.begin(9600);
pinMode(pushButtonIn, INPUT);
pinMode(pushButtonOut, INPUT);
pinMode(Lightgreen, OUTPUT);
pinMode(LightRed, OUTPUT);
pinMode(Buzzer, OUTPUT);
myservo.write(pos);

}

void loop()
{
 switch (STATE)

   {
    case 0:
    Serial.println("STATE0");
    digitalWrite(Buzzer, LOW);
    digitalWrite(LightRed, HIGH);
       break;

    case 1:
    Serial.println("STATE1");
    digitalWrite(Buzzer, HIGH);
    for (pos = 0; pos <=90; pos += 1)
    {
      myservo.write(pos);
      delay(100);
    }
    STATE = 2;
    break;

    case 2:
    Serial.println("STATE2");
    digitalWrite(LightRed, LOW);
    digitalWrite(Lightgreen, HIGH);
    digitalWrite(Buzzer, LOW);
    delay(crossingtime);
    break;

    case 3:
    Serial.println("STATE3");
    digitalWrite(Buzzer, HIGH);
    digitalWrite(LightRed, HIGH);
    digitalWrite(Lightgreen, LOW);
    for (pos = 90; pos >= 0; pos -= 1)
    {
      myservo.write(pos);
      delay(100);
    }
    STATE = 0;
    break;

    default:

    break;

   }


   InButtonstate = digitalRead(pushButtonIn);
   if (InButtonstate != lastInButtonState)
   {

    if (InButtonstate == LOW)
    {
     if (STATE == 0)
     {
      STATE = 1;
     }
    }
   }
   lastInButtonState = InButtonstate;

   OutButtonState = digitalRead(pushButtonOut);
   if (OutButtonState != LastOutButtonState)
   {
    if (OutButtonState == LOW)
    {
      if (STATE == 2)
      {
        STATE == 3;
      }
    }
   }
   LastOutButtonState = OutButtonState;




}