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

LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x27, 16 columns, 2 rows
const int ldrPin = 2;  // Pin connected to the LDR module

void setup() {
  Serial.begin(9600);
  pinMode(ldrPin, INPUT);
  
  Wire.begin();
  lcd.begin(16, 2);
  lcd.backlight();
  
  lcd.clear();
  lcd.print("LiFi Project");
  delay(3000);
  lcd.clear();
  lcd.print("Enter message:");
}

void loop() {
  // Read LDR value
  int ldrValue = analogRead(ldrPin);

  // Map LDR value to a range suitable for printing
  int mappedValue = map(ldrValue, 0, 1023, 0, 15);

  // Read user input from Serial Monitor
  if (Serial.available() > 0) {
    String userInput = Serial.readString();
    
    // Clear LCD and display user input
    lcd.clear();
    lcd.print(userInput);
    
    // Wait for a moment to display the message
    delay(2000);
    
    // Clear LCD and prompt for the next input
    lcd.clear();
    lcd.print("Enter message:");
  }
  
  delay(200);
}