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


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

const int ledPin = 13;
const int buzzerPin = 10;
const int pirPin = 9;
const int ldrPin = A0;
const int potPin = A1;
const int buttonPin = 8; // Pin for the push button

int pirState = LOW;
int ldrState = LOW;
int potValue = 0;
bool alarmeActivee = false; // Variable to track the alarm state
bool buttonPressed = false; // Variable to debounce the button press

void setup() {
  lcd.init(); // Initialize the LCD screen
  lcd.backlight(); // Turn on the backlight

  lcd.setCursor(0, 0);
  lcd.print("Alarm System");

  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(pirPin, INPUT);
  pinMode(ldrPin, INPUT);
  pinMode(buttonPin, INPUT_PULLUP); // Enable the pull-up resistor for the push button
}

void loop() {
  // Read the button state
  bool buttonState = digitalRead(buttonPin);

  // Check if the button is pressed and the alarm is not active
  if (buttonState == LOW && !buttonPressed && !alarmeActivee) {
    buttonPressed = true; // Set the button pressed flag
    alarmeActivee = true;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Alarme activee");
    delay(1000); // Delay to avoid button bounce
  }

  // Check if the button is released
  if (buttonState == HIGH) {
    buttonPressed = false; // Reset the button pressed flag
  }

  // If the alarm is active
  if (alarmeActivee) {
    potValue = analogRead(potPin);
    ldrState = digitalRead(ldrPin);
    pirState = digitalRead(pirPin);

    if ((ldrState == LOW) && (pirState == HIGH)) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Mouvement detecte!");
      digitalWrite(ledPin, HIGH);
      digitalWrite(buzzerPin, HIGH);
      delay(90); // Delay for LED and buzzer
      digitalWrite(ledPin, LOW);
      digitalWrite(buzzerPin, LOW);
      delay(900); // Delay before checking again
    } else if (ldrState == HIGH) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Pas de mouvement");
    }
  } else {
    // If the alarm is not active, display a message
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Alarme desactivee");
  }
}