Real Time Clock DS1307 Arduino Tutorial

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Real Time Clock DS1307

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Introduction

A real-time clock (RTC) is a computer clock (most often in the form of an integrated circuit) that keeps track of the current time.This module uses the RTC DS1307 IC and an extra EEPROM chip for farther use. In this tutorial you we learn how to use it to set the current time and date, and read it from the serial monitor of Arduino IDE.As long as it has a coin cell to run it, the RTC will merrily tick along for a long time, even when the Arduino loses power, or is reprogrammed! You can use any CR1220 3V lithium metal coin cell battery.

What you will need - Hardware

For this tutorial you will need:

Arduino uno
Breadboard (optional)
DS1307 RTC Module (i2c)
CR1220 3V batterty (coin cell)

To use this module you also need to solder 4 cables.

The Circuit

The connections are pretty easy:

Vcc to Arduino 5V pin
GND to Arduino GND pin
SDA to Arduino analog pin 4
SCL to Arduino analog pin 5

The code

Set current date and time with:rtc.adjust(DateTime(2016, 11, 19, 19, 45, 0)); // Format: YYYY,MM,DD,HH,MM,SS

Read day from RTC: now.day();
Read month from RTC: now.month();
Read year from RTC: now.year();
and etc...

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// Date and time functions using a DS1307 RTC connected via I2C and Wire lib #include <Wire.h> #include "RTClib.h" RTC_DS1307 rtc; char daysOfTheWeek[7][12] = {"Sunday","Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}; void setup () { Serial.begin(9600); if (! rtc.begin()) { Serial.println("Couldn't find RTC"); while (1); } if (! rtc.isrunning()) { Serial.println("RTC is NOT running!"); // 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 // January 21, 2014 at 3am you would call: rtc.adjust(DateTime(2016, 11, 19, 19, 45, 0)); // <----------------------SET TIME AND DATE: YYYY,MM,DD,HH,MM,SS } delay(100); } void loop () { DateTime now = rtc.now(); Serial.print(now.day(), DEC); Serial.print('/'); Serial.print(now.month(), DEC); Serial.print('/'); Serial.print(now.year(), DEC); Serial.print(" ("); Serial.print(daysOfTheWeek[now.dayOfTheWeek()]); 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); //Print date and time every 3 sec }

Download the code from here and open it with Arduino IDE. Inside you will also find and the RTC.h library.

rtc_ds1307_tutorial.zip
File Size:	17 kb
File Type:	zip

Download File

Open the serial monitor from tools menu of Arduino IDE.The result:

Well done!

You have successfully completed one more Arduino "How to" tutorial and you learned how to use the DS1307 RTC module.I hope you liked this, let me know in the comments.

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Real Time Clock DS1307 Arduino Tutorial