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

// Initialize the LCD at address 0x27 with 16 columns and 2 rows
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int sensorPin = 2;  // IR Sensor connected to digital pin 2
int personCount = 0;
bool sensorState = false;
bool lastSensorState = false;

void setup() {
  lcd.init();                  // Initialize LCD
  lcd.backlight();             // Turn on LCD backlight
  pinMode(sensorPin, INPUT);   // Set sensor pin as input

  lcd.setCursor(0, 0);
  lcd.print(" Entry Counter @ CLASS ROOM ");
  delay(2000);
  lcd.clear();
}

void loop() {
  sensorState = digitalRead(sensorPin);

  // Check for rising edge: No detection to detection
  if (sensorState == LOW && lastSensorState == HIGH) {
    personCount++;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Person Entered");
    lcd.setCursor(0, 1);
    lcd.print("Total: ");
    lcd.print(personCount);
    delay(500);  // Debounce delay
  }

  // Update last state
  lastSensorState = sensorState;
}