Human Presence

    #include<LiquidCrystal.h>
	LiquidCrystal lcd(13,12,11,10,9,8);
	#define in 14
	#define out 19
	#define relay 2
	int count = 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("Visitor Counter");
	delay(2000);
	pinMode(in, INPUT);
	pinMode(out, INPUT);
	pinMode(relay, OUTPUT);
	lcd.clear();
	lcd.print("Person In Room:");
	lcd.setCursor(0,1);
	lcd.print(count);
	}

	void loop()
	{
	if(digitalRead(in))
	IN();
	if(digitalRead(out))
	OUT();
	if(count<=0)
	{
	lcd.clear();
	digitalWrite(relay, HIGH);
	lcd.clear();
	lcd.print("Nobody In Room");
	lcd.setCursor(0,1);
	lcd.print("Light Is Off");
	delay(200);
	}
	else
	digitalWrite(relay, LOW);
	}