Shield DS 3231 RTC, gestire ora legale

International Italiano Software
9

HO provato

SukkoPera:
Sbagli ;D.

Sto provando il codice che mi hai consigliato :

// Date and time functions using a DS3231 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h" // https://github.com/adafruit/RTClib

RTC_DS3231 rtc;

char daysOfTheWeek[7][12] = {"Domenica", "Lunedì", "Martedì", "Mercoledì", "Giovedì", "Venerdì", "Sabato"};

void setup () {

#ifndef ESP8266
  while (!Serial); // for Leonardo/Micro/Zero
#endif

  Serial.begin(9600);

  delay(3000); // wait for console opening

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

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // 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));
  }
}

byte dstOffset (byte d, byte m, unsigned int y, byte h) {
  /* This function returns the DST offset for the current UTC time.
    This is valid for the EU, for other places see
    http://www.webexhibits.org/daylightsaving/i.html

    Results have been checked for 2012-2030 (but should work since
    1996 to 2099) against the following references:
    - http://www.uniquevisitor.it/magazine/ora-legale-italia.php
    - http://www.calendario-365.it/ora-legale-orario-invernale.html
  */

  // Day in March that DST starts on, at 1 am
  byte dstOn = (31 - (5 * y / 4 + 4) % 7);

  // Day in October that DST ends  on, at 2 am
  byte dstOff = (31 - (5 * y / 4 + 1) % 7);

  if ((m > 3 && m < 10) ||
      (m == 3 && (d > dstOn || (d == dstOn && h >= 1))) ||
      (m == 10 && (d < dstOff || (d == dstOff && h <= 1))))
    return 1;
  else
    return 0;
}

const int utcOffset = 1;

DateTime getLocalTime() {
  DateTime now = rtc.now();
  int32_t deltaSecs = (utcOffset + dstOffset (now.day(), now.month(), now.year(), now.hour()) * 3600UL);
  // int32_t deltaSecs = (utcOffset + dstOffset (now.day(), now.month(), now.year(), now.hour())) * SECS_PER_HOUR
  const unsigned long SECS_PER_HOUR = 3600;
  DateTime correctedNow (now + TimeSpan(deltaSecs));
  return correctedNow;
}

void loop () {
  DateTime now = getLocalTime();

  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), 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();

  Serial.print(" since midnight 1/1/1970 = ");
  Serial.print(now.unixtime());
  Serial.print("s = ");
  Serial.print(now.unixtime() / 86400L);
  Serial.println("d");

  // calculate a date which is 7 days and 30 seconds into the future
  DateTime future (now + TimeSpan(7, 12, 30, 6));

  Serial.print(" now + 7d + 30s: ");
  Serial.print(future.year(), DEC);
  Serial.print('/');
  Serial.print(future.month(), DEC);
  Serial.print('/');
  Serial.print(future.day(), DEC);
  Serial.print(' ');
  Serial.print(future.hour(), DEC);
  Serial.print(':');
  Serial.print(future.minute(), DEC);
  Serial.print(':');
  Serial.print(future.second(), DEC);
  Serial.println();

  Serial.println();
  delay(3000);
}

però sulla seriale mi riporta:

2018/4/7 (Sabato) 18:11:40
 since midnight 1/1/1970 = 1523124700s = 17628d
 now + 7d + 30s: 2018/4/15 6:41:46

ovvero un'ora esatta in più; Come mai secondo voi?