#include <LiquidCrystal_I2C.h>

#define LDR_PIN 2
const int laserled=3;
int count=0;
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  pinMode(LDR_PIN, INPUT);
  pinMode(laserled,OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop() {
  lcd.setCursor(2, 0);
  lcd.print("Persons: ");
  if (digitalRead(LDR_PIN) == LOW) {
    count++;
    lcd.print(count);
  } else {
    lcd.print(count);
    
  }
  delay(100);
}