61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// Date and time functions using a DS1307 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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DS3231 rtc;
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void setup () {
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Serial.begin(57600);
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Wire.begin(); // Shield I2C pins connect to alt I2C bus on Arduino Due
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rtc.begin();
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if (! rtc.isrunning()) {
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Serial.println("RTC is NOT running!");
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// following line sets the RTC to the date & time this sketch was compiled
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//rtc.adjust(DateTime(__DATE__, __TIME__));
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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(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.unixtime() + 7 * 86400L + 30);
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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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