#include <Wire.h>
#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
#include <dht11.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

dht11 DHT;
#define DHT11_PIN 4

RTC_DS3231 rtc;
LiquidCrystal_I2C lcd(0x3F, 16, 2);
int i = 0;
int pwm;

int minfrom00;
int sunrise;
int sunset;

byte oraa;
byte mina;
byte orat;
byte mint;

void setup() {

  pinMode(6, OUTPUT); // uscita PWM per dimmer
  pinMode(13, OUTPUT); // uscita ON/OFF luce
  sensors.begin();

  lcd.init();

  delay(3000); // wait for console opening

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if ( rtc.lostPower()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
  rtc.adjust(DateTime(2017, 3, 25, 06, 23, 50)); // usata per settare l'orologio ad orari diversi e verificare il funzionamento del tutto
}

void loop() {
  int chk;
  Serial.print("DHT11, \t");
  chk = DHT.read(DHT11_PIN);
  DateTime now = rtc.now();
  sensors.requestTemperatures();

  minfrom00 = (now.hour() * 60) + now.minute(); //calcola il numero di minuti a partire dalla mezzanotte

  sunrise = int(389 + (105 * cos(((((now.month() - 1) * 30.5) + now.day()) + 8) / 58.1)));
  sunset = int(1121 + (108 * sin(((((now.month() - 1) * 30.5) + now.day()) - 83) / 58.1)));
  oraa = (int)sunrise / 60; // ora alba
  mina = sunrise - oraa * 60; // minuti alba
  orat = (int)sunset / 60; // ora tramonto
  mint = sunset - orat * 60; // minuti tramonto
  lcd.backlight();
  lcd.print("Ora Alba ");
  lcd.print(oraa);
  lcd.print(":");
  lcd.print(mina);
  lcd.setCursor(0, 1);
  lcd.print("Ora Tram. ");
  lcd.print(orat);
  lcd.print(":");
  lcd.print(mint);
  delay(5000);
  lcd.setCursor(0, 0);
  lcd.clear();
  lcd.print("Ora Att ");
  lcd.print(now.hour(), DEC);
  lcd.print(":");
  lcd.print(now.minute(), DEC);
  lcd.setCursor(0, 1);
  lcd.print("lum. pwm ");
  lcd.print(pwm);
  delay(5000);
  lcd.setCursor(0, 0);
  lcd.clear();
  lcd.print("Temp. C. ");
  lcd.print(DHT.temperature, 1);
  lcd.setCursor(0, 1);
  lcd.print("Umid. ");
  lcd.print(DHT.humidity, 1);
  delay(5000);
  lcd.setCursor(0, 0);
  lcd.clear();
  lcd.print("Temp. H2O ");
  lcd.print (sensors.getTempCByIndex(0));
  lcd.print (" C");
  delay(5000);
  lcd.clear();



  if (minfrom00 >= sunrise && (minfrom00 < sunrise + 60)) { // è ora dell'alba
    digitalWrite(13, HIGH); // accende la luce
    i = minfrom00 - sunrise;
    pwm = map(i, 0, 59, 0, 255);
    analogWrite(6, pwm); // dimming ALBA
  }


  if ((minfrom00 >= (sunrise + 60)) && (minfrom00 < sunset)) {
    pwm = 255;
    analogWrite(6, pwm); // dimmer al massimo
  }


  if (minfrom00 >= sunset && (minfrom00 < sunset + 60)) { // è ora del tramonto
    i = minfrom00 - sunset;
    pwm = map(i, 0, 59, -255, 0);
    pwm = abs(pwm);
    analogWrite(6, pwm); // dimming TRAMONTO
  }

  //
  if (minfrom00 >= (sunset + 60)) {
    digitalWrite(13, LOW); // spegne la luce
    pwm = 0;
    analogWrite(6, pwm); // dimmer al minimo
  }
}