#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>  // Include the RTC library

// Define the LCD address, width, and height
LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust 0x27 if your LCD uses a different I2C address

// Define pin numbers for ultrasonic sensor and LED
const int trigPin = 9;
const int echoPin = 10;
const int ledPin = 7;

// Variables for ultrasonic sensor
long duration;
int distance;
String messages[] = {"Good Morning!", "Have a Nice Day!", "Stay Positive!", "Keep Smiling!", "You Got This!"};
int messageIndex = 0;

// Initialize RTC object
RTC_DS3231 rtc;

void setup() {
  // Initialize pins for ultrasonic sensor and LED
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  
  // Initialize the LCD with 16 columns and 2 rows
  lcd.begin(16, 2); 
  lcd.backlight();
  
  // Initialize the RTC
  if (!rtc.begin()) {
    lcd.setCursor(0, 0);
    lcd.print("RTC not found!");
    while (1);  // Halt if RTC not found
  }
  
  // Clear the LCD at the start (display is empty initially)
  lcd.clear();
}

void loop() {
  // Trigger the ultrasonic sensor to measure distance
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read echo and calculate distance
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  // Check if an object is within the detection range
  if (distance < 50) {
    // Turn on the LED
    digitalWrite(ledPin, HIGH);

    // Get current time and date from RTC
    DateTime now = rtc.now();

    // Display the message on the first line
    lcd.setCursor(0, 0);
    lcd.print(messages[messageIndex]);

    // Cycle through the messages every 3 seconds
    messageIndex = (messageIndex + 1) % 5;

    // Display the current date and time on the second line
    lcd.setCursor(0, 1);
    String dateTimeString = String(now.month()) + "/" + String(now.day()) + "/" + String(now.year()) + " " + 
                            String(now.hour()) + ":" + String(now.minute()) + ":" + String(now.second());
    lcd.print(dateTimeString);  // Print the formatted date and time

    delay(3000);  // Display each message for 3 seconds
  } else {
    // Turn off the LED if no object is detected
    digitalWrite(ledPin, LOW);

    // Keep the LCD empty if no object is detected
    lcd.clear();
  }

  delay(100);  // Small delay before the next loop iteration
}