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

#define rgbLedRedPin 4    // Red pin of RGB LED
#define rgbLedBluePin 5   // Blue pin of RGB LED
#define buzzerPin 6       // Buzzer pin
#define pirPin 2          // PIR sensor pin
#define inputPin 7        // Input pin to receive the stop signal

unsigned long motionStartTime = 0; // Variable to store the time when motion is detected
bool motionDetected = false; // Flag to track motion detection

// Define LCD address and dimensions
#define LCD_ADDR 0x27
#define LCD_COLS 16
#define LCD_ROWS 2

// Initialize LCD
LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

void setup() {
  pinMode(rgbLedRedPin, OUTPUT);
  pinMode(rgbLedBluePin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(pirPin, INPUT);
  pinMode(inputPin, INPUT);

  // Initialize the LCD
  lcd.init();
  lcd.backlight(); // Turn on backlight
}

void loop() {
  // Check PIR sensor
  if (digitalRead(pirPin) == HIGH) {
    if (!motionDetected) {
      // Motion detected for the first time, record the start time
      motionStartTime = millis();
      motionDetected = true;
      
      // Display motion detected message on LCD
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Motion Detected!");
      lcd.setCursor(0, 1);
      lcd.print("Hands UP :D");
    }

    // Turn on red LED and buzzer for the first half of the time
    digitalWrite(rgbLedRedPin, HIGH);
    digitalWrite(rgbLedBluePin, LOW);
    tone(buzzerPin, 550);
    
    // Wait for 0.5 seconds
    delay(500);

    // Turn on blue LED and buzzer for the second half of the time
    digitalWrite(rgbLedRedPin, LOW);
    digitalWrite(rgbLedBluePin, HIGH);
    tone(buzzerPin, 1500);
    
    // Wait for another 0.5 seconds
    delay(500);
  } else {
    // No motion detected
    digitalWrite(rgbLedRedPin, LOW);
    digitalWrite(rgbLedBluePin, LOW);
    noTone(buzzerPin);
    motionDetected = false; // Reset motion detection flag
    
    // Display message on LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("No Motion Detected");
    lcd.setCursor(0, 1);
    lcd.print("System Armed");
    
    delay(1000); // Delay to display the message
  }
}