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

#define DHT_TYPE DHT22
#define DHT_PIN 27
#define BLUE_PIN 14
#define RED_PIN 12

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Starting...");
  pinMode(RED_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void displayLCD(float temperature, float humidity) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");
}

void loop() {
  delay(2000);
  float t = dht.readTemperature();
  float h = dht.readHumidity();

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

  // Temperature: ?? / Humidity: ??
  Serial.print("Temperature :");
  Serial.print(t);
  Serial.print(" / Humidity: ");
  Serial.println(h);

  displayLCD(t, h);

  if (t >= 25 && t <= 30) {
    digitalWrite(RED_PIN, LOW);
    digitalWrite(BLUE_PIN, HIGH);
  } else {
    digitalWrite(RED_PIN, HIGH);
    digitalWrite(BLUE_PIN, LOW);
  }
}