https://arduino-info.wikispaces.com/DS1307_RealTime_Clock_Brick
/* YourDuinoStarter Example: DS1307 Real Time Clock
- WHAT IT DOES: Set and/or Run DS1307 Real Time Clock
- SEE the comments after "//" on each line below
- CONNECTIONS:
Function Arduino Pin Mega Pin
- Gnd Gnd
+ +5V +5V
SDA Analog A4 20
SCL Analog A5 21
- V1.02 04/26/2015
Questions: terry@yourduino.com */
/*-----( Import needed libraries )-----*/
#include <Wire.h>
#include "RTClib.h"
/*-----( Declare Constants and Pin Numbers )-----*/
// Not needed: RTC Lib expects connections as above
/*-----( Declare objects )-----*/
RTC_DS1307 rtc; // Create a RealTimeClock object
/*-----( Declare Variables )-----*/
// NONE because the library handles this...
void setup() /****** SETUP: RUNS ONCE ******/
{
Serial.begin(9600); // Set up for Serial Monitor to be able to see this work
// Set this in the lower right of the Serial Monitor screen
Serial.println("YourDuino.com DS1307 Real Time Clock - Set / Run Utility");
/*----( These lines allow code to work also on Arduino DUE )----- */
#ifdef AVR
Wire.begin();
#else
Wire1.begin(); // Shield I2C pins connect to alt I2C bus on Arduino Due
#endif
rtc.begin(); // Start the RTC library code
/*----( SET the date and time. Comment OUT these lines after setting )----*/
// Put these "//" in front of the line you do NOT want to use
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
// This line sets the RTC with an explicit date & time, for example to set
// May 21, 2015 at 6pm you would call: (use 24 hour time)
// rtc.adjust(DateTime(2015, 5, 21, 18, 0, 0));
}//--(end setup )---
void loop() /****** LOOP: RUNS CONSTANTLY ******/
{
DateTime now = rtc.now(); // Read data from the RTC Chip
Serial.print(now.year(), DEC); //
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(' ');
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
delay(3000);
}//--(end main loop )---
/*-----( Declare User-written Functions )-----*/
//NONE
//*********( THE END )***********
