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

// Define pins for sensors
#define LDR_PIN 32
#define DHTPIN 15
#define RAINPIN 34

// Initialize the LCD display
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Initialize the DHT22 sensor
DHT dht(DHTPIN, DHT22);

void setup() {
  // Debug console
  Serial.begin(115200);

  // Initialize DHT sensor
  dht.begin();

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Set pin modes
  pinMode(LDR_PIN, INPUT);
  pinMode(RAINPIN, INPUT);

  // Configure analog read resolution
  analogReadResolution(12);

  // Display startup message on LCD
  lcd.setCursor(0, 0);
  lcd.print("Weather Monitor");
  lcd.setCursor(4, 1);
  lcd.print("System");
  delay(4000);
  lcd.clear();

  // Run the sensors update once in setup
  getDHTValues();
  rainSensor();
  LDRsensor();
}

// Get the DHT22 sensor values
void getDHTValues() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" °C, Humidity: ");
  Serial.print(h);
  Serial.println(" %");

  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(t);
  lcd.print("C");

  lcd.setCursor(8, 0);
  lcd.print("H:");
  lcd.print(h);
  lcd.print("%");
}

// Get the rain sensor values
void rainSensor() {
  int Rvalue = analogRead(RAINPIN);
  Rvalue = map(Rvalue, 0, 4095, 0, 100);
  Rvalue = (Rvalue * -1) + 100;

  Serial.print("Rain: ");
  Serial.print(Rvalue);
  Serial.println(" %");

  lcd.setCursor(0, 1);
  lcd.print("R: ");
  lcd.print(Rvalue);
  lcd.print("%");
}

// Get the LDR sensor values
void LDRsensor() {
  int value = analogRead(LDR_PIN);

  Serial.print("Light: ");
  Serial.println(value);

  if (value > 2000) { // Arbitrary threshold for light intensity
    lcd.setCursor(8, 1);
    lcd.print("Light: High ");
  } else {
    lcd.setCursor(8, 1);
    lcd.print("Light: Low  ");
  }
}

void loop() {
  // Continuously update the sensors and LCD
  getDHTValues();
  rainSensor();
  LDRsensor();
  
  // Add a delay to avoid flooding the serial monitor
  delay(2000);
}