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

#define LDR_PIN A0 // Change LDR_PIN to the appropriate analog pin for your LDR
#define NTC_PIN A1 // Change NTC_PIN to the appropriate analog pin for your NTC temperature sensor
#define LED_PIN 13 // Define the pin number for the first LED
#define SECOND_LED_PIN 11 // Define the pin number for the second LED
#define BUZZER_PIN 8 // Define the pin number for the buzzer

// Define the predefined light threshold value
const int predefinedLightValue = 200; // Change this value to your predefined light level

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  pinMode(LDR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT); // Set first LED pin as an output
  pinMode(SECOND_LED_PIN, OUTPUT); // Set second LED pin as an output
  pinMode(BUZZER_PIN, OUTPUT); // Set buzzer pin as an output
  lcd.init();
  lcd.backlight();
  lcd.begin(20, 4); // Initialize LCD screen for 20x4 display
}

void loop() {
  int ldrValue = analogRead(LDR_PIN); // Read LDR value
  ldrValue = constrain(ldrValue, 0, 300); // Limit LDR value to maximum 300
  int ntcValue = analogRead(NTC_PIN); // Read NTC temperature sensor value

  lcd.clear(); // Clear the LCD display before printing new values
  lcd.setCursor(0, 0);
  lcd.print("LDR Value: ");
  lcd.print(ldrValue);

  lcd.setCursor(0, 1);
  lcd.print("Room: ");
  if (ldrValue < predefinedLightValue) { // Compare with predefined value
    lcd.print("Dark  ");
    digitalWrite(LED_PIN, HIGH); // Turn on first LED when it's dark
    lcd.setCursor(0, 2);
    lcd.print("AL: ON");
  } else {
    lcd.print("Light!");
    digitalWrite(LED_PIN, LOW); // Turn off first LED when it's light
    lcd.setCursor(0, 2);
    lcd.print("AL: OFF");
  }

  lcd.setCursor(0, 3);
  lcd.print("NTC Temp: ");
  float temperature = map(ntcValue, 0, 1023, 0, 100); // Convert analog value to temperature (0-100°C)

  // Ensure temperature doesn't go below indicated degrees
  temperature = max(temperature, 70);

  lcd.print(temperature);
  lcd.print(" C");

  // Check if temperature is below 75 degrees and turn on the second LED
  if (temperature < 75) {
    digitalWrite(SECOND_LED_PIN, HIGH); // Turn on second LED
  } else {
    digitalWrite(SECOND_LED_PIN, LOW); // Turn off second LED
  }

  // Check if temperature is below 80 degrees and beep the buzzer
  if (temperature < 80) {
    tone(BUZZER_PIN, 1000); // Generate a beep sound
    delay(100); // Beep duration
    noTone(BUZZER_PIN); // Stop the beep
  }

  delay(5000); // Adjust delay as necessary
}