#include "RTClib.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);

RTC_DS1307 rtc;

char daysOfTheWeek[7][15] = {"Domingo","Segunda-feira", "Terça-feira", "Quarta-feira", "Quinta-feira", "Sexta-Feira", "Sábado"};

void setup () {
  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  if (! rtc.begin()) {
    Serial.println("RTC não identificado!");
    Serial.flush();
    abort();
  }

}

void loop () {
  DateTime now = rtc.now();

  Serial.print("Hora atual: ");
  Serial.print(now.day(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.year(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();


  lcd.setCursor(0,0);
  lcd.print("Data atual:");
  lcd.print(now.day(), DEC);
  lcd.print('/');
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(now.year(), DEC);
  
  lcd.setCursor(3,1);
  lcd.print("(");
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
  lcd.print(") ");
  
  lcd.setCursor(0,2);
  lcd.print("Hora atual: ");
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);
  
const float BETA = 3950; // Deve corresponder ao coeficiente beta do termistor
int analogValue = analogRead(A0);
float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  
  lcd.setCursor(0,3);
  lcd.print("Temperatura: ");
  lcd.print(celsius, 2);
  
  delay(100);
}