#include<LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
#define in 8
#define OUTPUT 9
#define led 10
int count = 0;
void setup()
{
  lcd.begin(16, 2);
  lcd.print("Bidirectional");
  lcd.setCursor(0,1);
  lcd.print("Visitor Counter");
  delay(5000);
  pinMode(in, INPUT);
  pinMode(OUTPUT, INPUT);
  pinMode(led, OUTPUT);
  lcd.clear();
  lcd.print("Person In Room:");
  lcd.setCursor(0, 1);
  lcd.print(count);
}
void loop()
{
  int in_value = digitalRead(in);
  int OUT_value = digitalRead(OUTPUT);

  if (in_value == LOW)
  {
    count++;
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0, 1);
    lcd.print(count);
    delay(1000);
  }

  if (OUT_value == LOW)
  {
    count--;
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0, 1);
    lcd.print(count);
    delay(1000);
  }


  if (count == 0)
  {
    lcd.clear();
    digitalWrite(led, LOW);
    lcd.clear();
    lcd.print("Nobody In Room");
    lcd.setCursor(0, 1);
    lcd.print("light is Off");
    delay(200);
  }

  else
  {
    digitalWrite(led, HIGH);
  }
}