93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
// Date and time functions using a PCF8563 RTC connected via I2C and Wire lib
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#include "RTClib.h"
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RTC_PCF8563 rtc;
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char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
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void setup () {
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Serial.begin(115200);
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#ifndef ESP8266
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while (!Serial); // wait for serial port to connect. Needed for native USB
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#endif
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if (! rtc.begin()) {
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Serial.println("Couldn't find RTC");
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Serial.flush();
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while (1) delay(10);
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}
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if (rtc.lostPower()) {
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Serial.println("RTC is NOT initialized, let's set the time!");
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// When time needs to be set on a new device, or after a power loss, the
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// following line sets the RTC to the date & time this sketch was compiled
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rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
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// This line sets the RTC with an explicit date & time, for example to set
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// January 21, 2014 at 3am you would call:
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// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
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//
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// Note: allow 2 seconds after inserting battery or applying external power
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// without battery before calling adjust(). This gives the PCF8523's
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// crystal oscillator time to stabilize. If you call adjust() very quickly
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// after the RTC is powered, lostPower() may still return true.
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}
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// When time needs to be re-set on a previously configured device, the
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// following line sets the RTC to the date & time this sketch was compiled
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// rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
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// This line sets the RTC with an explicit date & time, for example to set
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// January 21, 2014 at 3am you would call:
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// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
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// When the RTC was stopped and stays connected to the battery, it has
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// to be restarted by clearing the STOP bit. Let's do this to ensure
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// the RTC is running.
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rtc.start();
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}
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void loop () {
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DateTime now = rtc.now();
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Serial.print(now.year(), DEC);
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Serial.print('/');
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Serial.print(now.month(), DEC);
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Serial.print('/');
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Serial.print(now.day(), DEC);
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Serial.print(" (");
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Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
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Serial.print(") ");
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Serial.print(now.hour(), DEC);
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Serial.print(':');
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Serial.print(now.minute(), DEC);
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Serial.print(':');
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Serial.print(now.second(), DEC);
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Serial.println();
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Serial.print(" since midnight 1/1/1970 = ");
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Serial.print(now.unixtime());
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Serial.print("s = ");
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Serial.print(now.unixtime() / 86400L);
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Serial.println("d");
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// calculate a date which is 7 days, 12 hours and 30 seconds into the future
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DateTime future (now + TimeSpan(7,12,30,6));
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Serial.print(" now + 7d + 12h + 30m + 6s: ");
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Serial.print(future.year(), DEC);
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Serial.print('/');
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Serial.print(future.month(), DEC);
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Serial.print('/');
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Serial.print(future.day(), DEC);
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Serial.print(' ');
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Serial.print(future.hour(), DEC);
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Serial.print(':');
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Serial.print(future.minute(), DEC);
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Serial.print(':');
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Serial.print(future.second(), DEC);
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Serial.println();
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Serial.println();
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delay(3000);
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}
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