#include<LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);

#define in 14
#define out 19
#define relay1 2
#define relay2 3
#define relay3 4
#define relay4 5
#define relay5 6

int count=0;
int fan = 7;
int fanSpeed=0;

void IN()
{
    count++;
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0,1);
    lcd.print(count);
    delay(1000);
}

void OUT()
{
    count--;
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0,1);
    lcd.print(count);
    delay(1000);
}

void setup()
{
  lcd.begin(16,2);
  lcd.print("Student Counter");
  delay(2000);
  pinMode(in, INPUT);
  pinMode(out, INPUT);
  pinMode(fan, OUTPUT);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  pinMode(relay5, OUTPUT);
  lcd.clear();
  lcd.print("Person In Room:");
  lcd.setCursor(0,1);
  lcd.print(count);
  lcd.clear();
}

void loop()
{  
  while(digitalRead(in) == LOW)
  {
  IN();
  digitalRead(out) == 0;
  delay(600);
  break;
  }
  while(digitalRead(out) == LOW)
  {
  OUT();
  digitalRead(in) == 0;
  delay(600);
  break;
  }
  
  if(count<=0)
  {
    lcd.clear();
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
    digitalWrite(relay4, LOW);
    digitalWrite(relay5, LOW);
    digitalWrite(fan, LOW);
    fanSpeed = 0;
    analogWrite(fan, fanSpeed);
    lcd.clear();
    lcd.print("Nobody In Room");
    lcd.setCursor(0,1);
    lcd.print("Light&Fan Is OFF");
    delay(200);
    count = 0;
  }
  
  if(count >= 1 && count <= 4)
  {
    lcd.clear();
    digitalWrite(relay1, HIGH);
    fanSpeed = 0.1;
    analogWrite(fan, fanSpeed);
    digitalWrite(fan, HIGH);
    lcd.clear();
    lcd.print("Fan Speed 20%");
    lcd.setCursor(0,1);
    lcd.print("R1 ON");
    delay(200);
  }

  if(count >= 5 && count <= 8)
  {
    lcd.clear();
    fanSpeed = 40;
    analogWrite(fan, fanSpeed);
    //digitalWrite(fan, HIGH);
    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, HIGH);
    lcd.clear();
    lcd.print("Fan Speed 40%");
    lcd.setCursor(0,1);
    lcd.print("R1,R2 ON");
    delay(200);
  }

  if(count >= 9 && count <= 12)
  {
    lcd.clear();
    fanSpeed = 60;
    analogWrite(fan, fanSpeed);
    //digitalWrite(fan, HIGH);
    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, HIGH);
    digitalWrite(relay3, HIGH);
    lcd.clear();
    lcd.print("Fan Speed 60%");
    lcd.setCursor(0,1);
    lcd.print("R1,R2,R3 ON");
    delay(200);
  }

  if(count >= 13 && count <= 16)
  {
    lcd.clear();
    fanSpeed = 80;
    analogWrite(fan, fanSpeed);
    //digitalWrite(fan, HIGH);
    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, HIGH);
    digitalWrite(relay3, HIGH);
    digitalWrite(relay4, HIGH);
    lcd.clear();
    lcd.print("Fan Speed 80%");
    lcd.setCursor(0,1);
    lcd.print("R1,R2,R3,R4 ON");
    delay(200);
  }

  if(count >= 17 && count <= 20)
  {
    lcd.clear();
    fanSpeed = 100;
    analogWrite(fan, fanSpeed);
    digitalWrite(fan, HIGH);
    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, HIGH);
    digitalWrite(relay3, HIGH);
    digitalWrite(relay4, HIGH);
    digitalWrite(relay5, HIGH);
    lcd.clear();
    lcd.print("Fan Speed 100%");
    lcd.setCursor(0,1);
    lcd.print("ALL ON");
    delay(200);
  }

  else
  lcd.clear();
  lcd.print("Class is FULL");
  
}