/*
  Smart Weather Monitoring System
  Components: DHT22, BMP180, LCD1602 , Red LED, Green LED, Buzzer, Potentiometer
  Board: Arduino Uno
*/

#include <LiquidCrystal.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_BMP085.h>   // Also supports BMP180

// ---------- Pin Definitions ----------
#define DHTPIN 6
#define DHTTYPE DHT22

const int lcdRS = 12, lcdE = 11, lcdD4 = 10, lcdD5 = 9, lcdD6 = 8, lcdD7 = 7;
const int redLED = 5;
const int greenLED = 4;
const int buzzerPin = 3;
const int potPin = A0;

// ---------- Thresholds ----------
const float TEMP_HIGH = 35.0;
const float HUMIDITY_HIGH = 80.0;

// ---------- Objects ----------
LiquidCrystal lcd(lcdRS, lcdE, lcdD4, lcdD5, lcdD6, lcdD7);
DHT dht(DHTPIN, DHTTYPE);
Adafruit_BMP085 bmp;

unsigned long lastRead = 0;
const unsigned long interval = 2000;

void setup() {
  Serial.begin(9600);

  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  lcd.begin(16, 2);
  lcd.print("Weather Monitor");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");

  dht.begin();

  if (!bmp.begin()) {
    lcd.clear();
    lcd.print("BMP180 error!");
    Serial.println("Could not find BMP180 sensor, check wiring!");
    while (1) {}
  }

  delay(1500);
  lcd.clear();
}

void loop() {
  if (millis() - lastRead >= interval) {
    lastRead = millis();

    float humidity = dht.readHumidity();
    float tempDHT = dht.readTemperature();
    float pressure = bmp.readPressure() / 100.0F;
    float tempBMP = bmp.readTemperature();
    int potValue = analogRead(potPin);

    if (isnan(humidity) || isnan(tempDHT)) {
      lcd.clear();
      lcd.print("DHT read error");
      Serial.println("Failed to read from DHT sensor!");
      return;
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T:");
    lcd.print(tempDHT, 1);
    lcd.print("C H:");
    lcd.print(humidity, 0);
    lcd.print("%");

    lcd.setCursor(0, 1);
    lcd.print("P:");
    lcd.print(pressure, 0);
    lcd.print("hPa");

    Serial.print("DHT Temp: "); Serial.print(tempDHT);
    Serial.print(" C, Humidity: "); Serial.print(humidity);
    Serial.print(" %, BMP Temp: "); Serial.print(tempBMP);
    Serial.print(" C, Pressure: "); Serial.print(pressure);
    Serial.print(" hPa, Pot: "); Serial.println(potValue);

    if (tempDHT >= TEMP_HIGH) {
      digitalWrite(redLED, HIGH);
      tone(buzzerPin, 1000);
    } else {
      digitalWrite(redLED, LOW);
      noTone(buzzerPin);
    }

    if (humidity >= HUMIDITY_HIGH) {
      digitalWrite(greenLED, HIGH);
    } else {
      digitalWrite(greenLED, LOW);
    }
  }
}