#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int sensor1Pin = 2;
int sensor2Pin = 14;
int visitorCount = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  
  pinMode(sensor1Pin, INPUT);
  pinMode(sensor2Pin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int sensor1State = digitalRead(sensor1Pin);
  int sensor2State = digitalRead(sensor2Pin);
  
  if (sensor1State == HIGH && sensor2State == LOW) {
    Serial.println("Visitor IN");
    delay(1000);
    
    visitorCount++;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Visitors:");
    lcd.setCursor(0, 1);
    lcd.print(visitorCount);
    
    delay(1000);
  }
  else if (sensor1State == LOW && sensor2State == HIGH){
    Serial.println("Visitor OUT");
    delay(500);
    
    if(visitorCount > 0) {
      visitorCount--;
    }
    
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Visitors:");
    lcd.setCursor(0, 1);
    lcd.print(visitorCount);
    
    delay(1000);
  }
  else {
    Serial.println("No Visitors");
    delay(1000);
  }
}