{

byte rtcID[8];

Serial.begin(115200);

// setSyncProvider() causes the Time library to synchronize with the

// external RTC by calling RTC.get() every five minutes by default.

setSyncProvider(RTC.get);

Serial << endl << F("RTC Sync");

if (timeStatus() != timeSet) Serial << F(" FAIL!");

Serial << endl;

RTC.idRead(rtcID);

Serial << F("RTC ID = ");

for (int i=0; i<8; ++i) {

if (rtcID[i] < 16) Serial << '0';

Serial << _HEX(rtcID[i]);

}

Serial << endl;

RTC.getEUI64(rtcID);

Serial << F("EUI-64 = ");

for (int i=0; i<8; ++i) {

if (rtcID[i] < 16) Serial << '0';

Serial << _HEX(rtcID[i]);

}

Serial << endl;

Serial << F("Calibration Register = ") << RTC.calibRead() << endl;

{

static time_t tLast;

time_t t;

tmElements_t tm;

int cmdChar, y, oldCal, newCal;

// check for input, first character is a command, "S" to set date/time, or "C" to set the calibration register

if (Serial.available()) {

cmdChar = Serial.read();

switch (cmdChar) {

case 'S':

case 's':

// note that the tmElements_t Year member is an offset from 1970,

// but the RTC wants the last two digits of the calendar year.

// use the convenience macros from TimeLib.h to do the conversions.

y = Serial.parseInt();

if (y >= 100 && y < 1000)

Serial << F("Error: Year must be two digits or four digits!") << endl;

else {

if (y >= 1000)

tm.Year = CalendarYrToTm(y);

else //(y < 100)

tm.Year = y2kYearToTm(y);

tm.Month = Serial.parseInt();

tm.Day = Serial.parseInt();

tm.Hour = Serial.parseInt();

tm.Minute = Serial.parseInt();

tm.Second = Serial.parseInt();

t = makeTime(tm);

RTC.set(t); // use the time_t value to ensure correct weekday is set

setTime(t);

Serial << F("RTC set to: ");

printDateTime(t);

Serial << endl;

}

break;

case 'C':

case 'c':

newCal = Serial.parseInt();

oldCal = RTC.calibRead();

RTC.calibWrite(newCal);

Serial << F("Calibration changed from ") << oldCal << F(" to ") << RTC.calibRead() << endl;

break;

default:

Serial << endl << F("Unrecognized command: ") << (char)cmdChar << endl;

break;

}

// dump any extraneous input

while (Serial.available() > 0) Serial.read();

}

t = now();

if (t != tLast) {

tLast = t;

printDateTime(t);

Serial << endl;

}

{

printDate(t);

Serial << ' ';

printTime(t);

{

printI00(hour(t), ':');

printI00(minute(t), ':');

printI00(second(t), ' ');

{

printI00(day(t), 0);

Serial << monthShortStr(month(t)) << _DEC(year(t));

{

if (val < 10) Serial << '0';

Serial << _DEC(val);

if (delim > 0) Serial << delim;

return;