Tiny RTC I2C Module 24C32 Memory DS1307 Clock ARDUINO

บทความการใช้งานของร้าน Arduitronics

https://www.arduitronics.com/article/real-time-clock-ds3231

Interesting Link

https://www.sparkfun.com/datasheets/Components/DS1307.pdf

http://zygzax.com/2013/04/22/reloj-con-arduino-y-el-modulo-tiny-rtc-i2c/?lang=en

Download Sample and Documentation

This tiny RTC module is based on the clock chip DS1307 which supports the I2C protocol. It uses a Lithium cell battery (CR1225). The clock/calendar provides seconds, minutes, hours, day, date,month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator.

Feature:

• I2C interface
• DS1307 based RTC with LIR2032 battery (Battery included)
• Backup by AT24C32 32Kbit
• DS1307,AT24C32 can work singleness
• Dimention: 28x25x8.4mm
• Weight:6.3g(include Battery)

#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68 // the I2C address of Tiny RTC
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
return ( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
return ( (val/16*10) + (val%16) );
}
// Function to set the currnt time, change the second&minute&hour to the right time
void setDateDs1307()
{
second =45;
minute = 29;
hour = 13;
dayOfWeek = 2;
dayOfMonth =18;
month =9;
year= 12;
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(decToBcd(0));
Wire.write(decToBcd(second)); // 0 to bit 7 starts the clock
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour)); // If you want 12 hour am/pm you need to set
// bit 6 (also need to change readDateDs1307)
Wire.write(decToBcd(dayOfWeek));
Wire.write(decToBcd(dayOfMonth));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.endTransmission();
}
// Function to gets the date and time from the ds1307 and prints result
void getDateDs1307()
{
// Reset the register pointer
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(decToBcd(0));
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
second = bcdToDec(Wire.read() & 0x7f);
minute = bcdToDec(Wire.read());
hour = bcdToDec(Wire.read() & 0x3f); // Need to change this if 12 hour am/pm
dayOfWeek = bcdToDec(Wire.read());
dayOfMonth = bcdToDec(Wire.read());
month = bcdToDec(Wire.read());
year = bcdToDec(Wire.read());
Serial.print(hour, DEC);
Serial.print(":");
Serial.print(minute, DEC);
Serial.print(":");
Serial.print(second, DEC);
Serial.print(" ");
Serial.print(month, DEC);
Serial.print("/");
Serial.print(dayOfMonth, DEC);
Serial.print("/");
Serial.print(year,DEC);
Serial.print(" ");
Serial.println();
//Serial.print("Day of week:");
}
void setup() {
Wire.begin();
Serial.begin(19200);
setDateDs1307(); //Set current time;
}
void loop()
{
delay(2000);
getDateDs1307();//get the time data from tiny RTC
}