DF ROBOT DS1307 User manual

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RealTimeClockModule(DS1307)V1.1(SKU:DFR0151)
Contents
1Introduction
2Specification
3Application
4Tutorial
4.1 Connection diagram
4.2 Sample Code
4.3 Result
5Trouble shooting
Introduction
The DS1307 Real Time Clock developed by one of our designers: Waiman. The module comes fully
assembled and pre-programmed with the current time (ok, so it's our current time - MST). The
included Lithium coin cell battery (CR1225 41mAh) will run the module for a minimum of 9 years (17
years typical) without external 5V power. The DS1307 is accessed via the I2C protocol.
Except the DS1307 real time clock, the module also integrate the I2C EEPROM chip(24C32) and the
DS18B20 sensor interface. The I2C EEPROM makes it possible to save the sensor data easily
without spending too much microcontroller source. And the DS18B20 interface with the pull-up
resistor embeded will be helpful to extend temperature monitoring feature for your project.
Specification
Working voltage: 5v
Two wire I2C interface
Hour : Minutes : Seconds AM/PM
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Day Month, Date - Year
Leap year compensation
Accurate calendar up to year 2100
Consumes Less than 500nA in Battery-Backup
Battery included
1Hz output pin
56 Bytes of Non-volatile memory available to user
provides 32,768 bits(4KB) of serial electrically erasable and programmable
read only memory (EEPROM)
Embed DS18B20 temperature sensor interface with the pull-up resistor
Dimensions: 28mm x 25mm x 8mm
Application
Real time monitoring system
Timer
Tutorial
Connectiondiagram
Wiring instruction
GND——GND VCC——5V
SDA——A4 SCL——A5
DS——D2
SampleCode
Please download and install the Arduino library first.
how to install libary
http://www.dfrobot.com/image/data/DFR0151/V1.1/Arduino%20library.zip
https://www.arduino.cc/en/Guide/Libraries#.UxU8mdzF9H0
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#include <Wire.h>
#include <DS1307.h>
/*
about set time:
format: year,month,day,week,hour,min,sec
example: 14,03,25,02,13,55,10 2014.03.25 tuesday 13:55:10
*/
String comdata = "";
int mark=0;
//store the current time data
int rtc[7];
//store the set time data
byte rr[7];
//light pin
int ledPin = 13;
//initial light
void setup()
{
DDRC |= _BV(2) | _BV(3); // POWER:Vcc Gnd
PORTC |= _BV(3); // VCC PINC3
pinMode(ledPin, OUTPUT);
//initial baudrate
Serial.begin(9600);
//get current time
RTC.get(rtc, true);
//if time is wrong reset to default time
if (rtc[6] < 12) {
//stop rtc time
RTC.stop();
RTC.set(DS1307_SEC, 1);
RTC.set(DS1307_MIN, 27);
RTC.set(DS1307_HR, 01);
RTC.set(DS1307_DOW, 7);
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RTC.set(DS1307_DATE, 12);
RTC.set(DS1307_MTH, 2);
RTC.set(DS1307_YR, 12);
//start rtc time
RTC.start();
}
//RTC.SetOutput(LOW);
//RTC.SetOutput(HIGH);
//RTC.SetOutput(DS1307_SQW1HZ);
//RTC.SetOutput(DS1307_SQW4KHZ);
//RTC.SetOutput(DS1307_SQW8KHZ);
RTC.SetOutput(DS1307_SQW32KHZ);
}
void loop()
{
int i;
//get current time
RTC.get(rtc, true);
//print current time format : year month day week hour min sec
for (i = 0; i < 7; i++)
{
Serial.print(rtc[i]);
Serial.print(" ");
}
//blink the light
Serial.println();
digitalWrite(ledPin, HIGH);
delay(500);
digitalWrite(ledPin, LOW);
delay(500);
//
int j = 0;
//read all the data
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while (Serial.available() > 0)
{
comdata += char(Serial.read());
delay(2);
mark = 1;
}
//if data is all collected,then parse it
if (mark == 1)
{
Serial.println(comdata);
Serial.println(comdata.length());
//parse data
for (int i = 0; i < comdata.length() ; i++)
{
//if the byte is ',' jump it,and parse next value
if (comdata[i] == ',')
{
j++;
}
else
{
rr[j] = rr[j] * 10 + (comdata[i] - '0');
}
}
comdata = String("");
RTC.stop();
RTC.set(DS1307_SEC, rr[6]);
RTC.set(DS1307_MIN, rr[5]);
RTC.set(DS1307_HR, rr[4]);
RTC.set(DS1307_DOW, rr[3]);
RTC.set(DS1307_DATE, rr[2]);
RTC.set(DS1307_MTH, rr[1]);
RTC.set(DS1307_YR, rr[0]);
RTC.start();
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mark = 0;
}
}
Result
Troubleshooting
Thank the guy to share this great way to update DS1307 clock through computer, in this way, you
could get the precise time.
Guide Link http://www.lucadentella.it/en/2013/11/27/rtcsetup/
Download library https://github.com/adafruit/RTClib
Download sketch & pc_software https://github.com/lucadentella/RTCSetup
More question and cool idea,visit DFRobot Forum
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