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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust the I2C address and LCD dimensions as needed

#define ldrPin 32

int val;
int val2;
String duration = "";

void setup() {
  Serial.begin(9600);
  pinMode(ldrPin, INPUT_PULLUP);
  lcd.init(); // Initialize the LCD display
  lcd.backlight(); // Turn on backlight
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("LiFi Project");
  delay(3000);
  lcd.clear();
  lcd.print("Send any message");
  lcd.setCursor(0, 1);
  lcd.print("from LiFi App..");
  delay(1000);
}

void loop() {
  int val = digitalRead(ldrPin);
  while (val == LOW) {
    int val2 = digitalRead(ldrPin);
    duration += val2;
    if (duration == "001") {
      Serial.println("Received message: hi");
      lcd.clear();
      lcd.print("hi");
    } else if (duration == "0001") {
      Serial.println("Received message: hello");
      lcd.clear();
      lcd.print("hello");
    } else if (duration == "00001") {
      Serial.println("Received message: how are you?");
      lcd.clear();
      lcd.print("how are you?");
    } else if (duration == "000001") {
      Serial.println("Received message: I am fine");
      lcd.clear();
      lcd.print("I am fine");
    } else if (duration == "0000001") {
      Serial.println("Received message: ok");
      lcd.clear();
      lcd.print("ok");
    } else if (duration == "00000001") {
      Serial.println("Received message: good morning");
      lcd.clear();
      lcd.print("good morning");
    } else if (duration == "000000001") {
      Serial.println("Received message: good afternoon");
      lcd.clear();
      lcd.print("good afternoon");
    } else if (duration == "0000000001") {
      Serial.println("Received message: good evening");
      lcd.clear();
      lcd.print("good evening");
    } else if (duration == "00000000001") {
      Serial.println("Received message: thank you");
      lcd.clear();
      lcd.print("thank you");
    } else if (duration == "000000000001") {
      Serial.println("Received message: sorry");
      lcd.clear();
      lcd.print("sorry");
    }
    if (val2 == HIGH) {
      duration = "";
      break;
    }
    delay(200);
  }
}