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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

int pirPin = 2; // PIR sensor pin
int trigPin = 7; // Ultrasonic sensor Trig pin
int echoPin = 8; // Ultrasonic sensor Echo pin

void setup() {
  lcd.begin(16, 2); // Initialize the LCD
  lcd.clear(); // Clear the LCD screen
  pinMode(pirPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int pirValue = digitalRead(pirPin);
  
  // Ultrasonic sensor distance measurement
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2;

  if (distance <= 3) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("IN");
    delay(1000);
    
  } else if (pirValue == HIGH) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("OUT");
    delay(1000);
  }
}