55 lines
1.2 KiB
Plaintext
55 lines
1.2 KiB
Plaintext
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// Date and time functions using a DS1307 RTC connected via I2C and SoftI2cMaster
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#include <I2cMaster.h>
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#include <SoftRTClib.h>
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#if defined(__AVR_ATmega1280__)\
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|| defined(__AVR_ATmega2560__)
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// Mega analog pins 4 and 5
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// pins for DS1307 with software i2c on Mega
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#define SDA_PIN 58
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#define SCL_PIN 59
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#elif defined(__AVR_ATmega168__)\
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||defined(__AVR_ATmega168P__)\
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||defined(__AVR_ATmega328P__)
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// 168 and 328 Arduinos analog pin 4 and 5
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#define SDA_PIN 18
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#define SCL_PIN 19
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#else // CPU type
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#error unknown CPU
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#endif // CPU type
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// An instance of class for software master
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SoftI2cMaster i2c(SDA_PIN, SCL_PIN);
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RTC_DS1307 RTC(&i2c);
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void setup () {
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Serial.begin(9600);
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}
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void loop () {
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DateTime now = RTC.now();
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now.printIsoDateTime(&Serial);
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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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future.printIsoDateTime(&Serial);
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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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