#include <LiquidCrystal.h>
#include <ESP32Servo.h>

LiquidCrystal lcd(13, 12, 14, 27, 26, 25);
Servo servo;
int num_of_students=0;

void setup() {
  lcd.begin(16,2);
  servo.attach(33);
  pinMode(2,INPUT);
  pinMode(4,INPUT);
}

void loop() {
  if(digitalRead(2) && num_of_students<15){
    servo.write(0);
    delay(5000);
    servo.write(90);
    num_of_students+=1;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("People = ");
    lcd.print(num_of_students);
  }
  else{
    if(digitalRead(4) &&num_of_students!=0){
      servo.write(0);
      delay(5000);
      servo.write(90);
      num_of_students--;
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("People = ");
      lcd.print(num_of_students);
    }
else if(num_of_students==15)
{
lcd.setCursor(0,1);
lcd.print("Room is full");
}
}
}