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

#define DHTPIN 4
#define DHTTYPE DHT22
#define RED 26          // Red LED for critical or high humidity
#define GREEN 25        // Green LED for normal humidity
#define BLUE 27         // Blue LED for low humidity 
#define BUZZER 19       // Buzzer


DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);  

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

    pinMode(RED, OUTPUT);
    pinMode(GREEN, OUTPUT);
    pinMode(BLUE, OUTPUT);
    pinMode(BUZZER, OUTPUT);
}

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

    if (isnan(temp) || isnan(hum)) {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Sensor Error");
        return;
    }

    lcd.clear();  // Clear the LCD for new data
    lcd.setCursor(0, 0);
    lcd.print("Smart Humid Control");
    lcd.setCursor(0, 1);
    lcd.print("Temp: ");
    lcd.print(temp);
    lcd.print(" C");

    lcd.setCursor(0, 2);
    lcd.print("Room Humidity: ");
    lcd.print(hum);
    lcd.print(" %");

    lcd.setCursor(0, 3);
    lcd.print("Isa Red Carpio");

    // Humidity levels
    if (hum < 40.0) {
        // Low humidity: Turn on humidifier
        digitalWrite(BLUE, HIGH);
        digitalWrite(GREEN, LOW);
        digitalWrite(RED, LOW);
        digitalWrite(BUZZER, HIGH);
    } else if (hum >= 40.0 && hum <= 60.0) {
        // Normal humidity
        digitalWrite(GREEN, HIGH);
        digitalWrite(BLUE, LOW);
        digitalWrite(RED, LOW);
        digitalWrite(BUZZER, LOW);
    } else {
        // High humidity: Turn off humidifier if on
        digitalWrite(RED, HIGH);
        digitalWrite(GREEN, LOW);
        digitalWrite(BLUE, LOW);
        digitalWrite(BUZZER, HIGH);
    }

    delay(2000); // Delay for 2 seconds before the next reading
}