#include <LiquidCrystal.h>

// Initialize the LCD library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

int pirSensorPin = 2;  // PIR sensor pin
int pirState = LOW;    // Start assuming no motion detected
int val = 0;           // Variable for reading the PIR status

void setup() {
  pinMode(pirSensorPin, INPUT);  // Set the PIR sensor pin as an input
  lcd.begin(16, 2);              // Set up the LCD's number of columns and rows
  lcd.print("No motion");        // Print initial message
}

void loop() {
  val = digitalRead(pirSensorPin);  // Read input value from the PIR sensor

  if (val == HIGH) {                // Check if the PIR sensor's output is HIGH
    if (pirState == LOW) {
      // We have just turned on
      lcd.clear();
      lcd.print("Motion detected!"); // Print message
      pirState = HIGH;
    }
  } else {
    if (pirState == HIGH) {
      // We have just turned off
      lcd.clear();
      lcd.print("No motion");        // Print message
      pirState = LOW;
    }
  }
}