#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define DHTPIN 15
#define DHTTYPE DHT22
#define RED_LED 16
#define BLUE_LED 17

const int TEMP_THRESHOLD = 35; // Temperature threshold in °C
const int HUMIDITY_THRESHOLD = 70; // Humidity threshold in %

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 columns, 2 rows

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.init();
  lcd.backlight();

  // Initialize LED pins as outputs
  pinMode(RED_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
  digitalWrite(RED_LED, LOW);
  digitalWrite(BLUE_LED, LOW);

  lcd.setCursor(0, 0);
  lcd.print("Starting...");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read sensor data
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // Check for valid readings
  if (isnan(temp) || isnan(hum)) {
    Serial.println("Sensor read failed");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error");
    digitalWrite(RED_LED, LOW);
    digitalWrite(BLUE_LED, LOW);
  } else {
    // Update LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temp, 1);
    lcd.print((char)223); // Degree symbol
    lcd.print("C");

    lcd.setCursor(0, 1);
    lcd.print("Hum: ");
    lcd.print(hum, 1);
    lcd.print("%");

    // Control LEDs
    if (temp > TEMP_THRESHOLD) {
      digitalWrite(RED_LED, HIGH); // Turn on red LED for overheating
    } else {
      digitalWrite(RED_LED, LOW);
    }

    if (hum > HUMIDITY_THRESHOLD) {
      digitalWrite(BLUE_LED, HIGH); // Turn on blue LED for high humidity
    } else {
      digitalWrite(BLUE_LED, LOW);
    }

    Serial.print("Temp: ");
    Serial.print(temp, 1);
    Serial.print("C, Hum: ");
    Serial.print(hum, 1);
    Serial.println("%");
  }

  delay(3000); // Update every 3 seconds
}