52 lines
1.1 KiB
C++
52 lines
1.1 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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DS1307 rtc;
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// buffer for DateTime.tostr
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char buf[20];
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void setup() {
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Serial.begin(9600);
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#ifdef AVR
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Wire.begin();
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#else
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Wire1.begin(); // Shield I2C pins connect to alt I2C bus on Arduino Due
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#endif
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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.println(now.tostr(buf));
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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 + (7 * 86400L + 30));
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Serial.print(" now + 7d + 30s: ");
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Serial.println(future.tostr(buf));
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// calculate a date which is 30 days before
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DateTime past(now - TimeDelta(30 * 86400L));
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Serial.print(" now - 30d: ");
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Serial.println(past.tostr(buf));
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Serial.println();
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delay(3000);
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}
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