code.txt

#include "LiquidCrystal.h"

LiquidCrystal lcd(9, 8, 7, 6, 5, 4); // Pins of the lcd
volatile int pirState = LOW; // Stores the PIR sensor state
void setup()
{
    Serial.begin(9600);
    lcd.begin(16, 2);
    lcd.setCursor(0, 0);
    lcd.print("  PIR Sensor   ");
    pinMode(2, INPUT); // PIR sensor output pin connected

    // Attach the interrupt handler function to the interrupt pin (INT0 on pin 2)
    attachInterrupt(digitalPinToInterrupt(2), pirInterrupt, CHANGE);
}
void pirInterrupt()
{
    pirState = digitalRead(2); // Read the PIR sensor state and store it in the global variable
}
void loop()
{
    // You can remove this line, as the interrupt will handle updating the pirState variable
    // val = digitalRead(2);

    Serial.println(pirState); // See the value in the serial monitor in Arduino IDE

    if (pirState == HIGH)
    {
        lcd.setCursor(0, 1);
        lcd.print("    DETECTED      ");
    }
    else
    {
        lcd.setCursor(0, 1);
        lcd.print("  NOT DETECTED    ");
    }
}