침입 방지 경보

#include <LiquidCrystal.h> // Library for LCD screen
LiquidCrystal lcd(13,12,6,5,3,2); // Initialize the library
int led = 7;
int PIR = 4;
int buzzer = 8;
int PIRstatus; // Variable to know if the PIR sensor detected motion or not

void setup()
{
  lcd.begin(16,2); // Initialize the LCD screen
  // Set the LED and buzzer as OUTPUT and the PIR as INPUT
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(PIR, INPUT);
  lcd.clear();
}

void loop()
{
  PIRstatus = digitalRead(PIR); // Read the PIR sensor value
  if (PIRstatus == HIGH) { // If the sensor detects motion
    lcd.clear();
    digitalWrite(led, HIGH);
    digitalWrite(buzzer, HIGH); // Activate the buzzer
    tone(buzzer, 300, 10000);       
    lcd.setCursor(0, 0);
    lcd.print("ALERT"); // Display "ALERT" on the screen

    delay(7000);
    lcd.clear();
  }
  else
  {
    lcd.setCursor(0, 0);
    lcd.print("SAFE"); // If no motion is detected, display "SAFE"
    digitalWrite(led, LOW);
    digitalWrite(buzzer, LOW);
  }
  delay(1000);
}