78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
// Date and time functions using a DS3231 RTC connected via I2C and Wire lib
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#include <Wire.h>
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#include "RTClib.h"
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RTC_DS3231 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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#ifndef ESP8266
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while (!Serial); // for Leonardo/Micro/Zero
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#endif
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Serial.begin(9600);
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delay(3000); // wait for console opening
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if (! rtc.begin()) {
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Serial.println("Couldn't find RTC");
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while (1);
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}
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if (rtc.lostPower()) {
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Serial.println("RTC lost power, lets set the time!");
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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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}
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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 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 + 30s: ");
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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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