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

#define in 3
#define out 4
#define relay 2

int count = 0;

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

void OUT()
{
  count--;
  lcd.clear();
  lcd.print("Person(s)in Bus:");
  lcd.setCursor(0, 1);
  lcd.print(count);
  delay(1000);
}
void setup()
{
  lcd.begin(16, 2);
  lcd.print("The Smart Station");
  delay(2000);
  pinMode(in, INPUT);
  pinMode(out, INPUT);
  pinMode(relay, OUTPUT);
  lcd.clear();
  lcd.print("Person(s)in Bus:");
  lcd.setCursor(0, 1);
  lcd.print(count);
}


void loop()
{

  if (digitalRead(in))
    IN();
  if (digitalRead(out))
    OUT();

  if (count <= 0) {
    lcd.clear();
    digitalWrite(relay, LOW);
    lcd.clear();
    lcd.print("Nobody In Bus");
    lcd.setCursor(0, 1);
    delay(200);
  }

  else
    digitalWrite(relay, HIGH);

}