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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

#define DHTPIN 12
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));

  dht.begin();
    // Init
  lcd.init();
  lcd.backlight();

  // Print something
  lcd.setCursor(3, 0);
  lcd.print("Hello, world!");
  lcd.setCursor(2, 1);
  lcd.print("Wokwi Online IoT");
  lcd.setCursor(5, 2);
  lcd.print("Simulator");
  lcd.setCursor(7, 3);
  lcd.print("Enjoy!");
  
  delay(2000);
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);
  Serial.print("Humid: ");
  Serial.print(h);
  Serial.println("%");
  Serial.print("Temp: ");
  Serial.print(t);
  Serial.println("°C");
  Serial.print(hic);
  Serial.print(F("°C "));

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T=");
  lcd.printf("%.0f",t);
  lcd.print("*C");
  lcd.setCursor(0, 1);
  lcd.print("H=");
  lcd.printf("%.0f",h);
  lcd.print("%");
  lcd.setCursor(9, 0);
  lcd.print("HeatIdx");
  lcd.setCursor(9, 1);
  lcd.printf("%.1f",hic);
  lcd.print("*C");
  delay(5000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
}