Comments on: Interfacing DS1307 RTC Chip with AVR Microcontroller

By: Tifany Wiebusch

Tifany Wiebusch — Tue, 09 Mar 2010 14:08:56 +0000

I go along with you actually, I believe! Might this become doable for you to have your blog translated directly into Russian? English is actually my own 2nd language.

By: parag

parag — Fri, 05 Mar 2010 10:48:00 +0000

hello sir,
i am working on a project using PIC 16F877. can u help me for writing code for interfacing DS1307 with PIC using instructions only and not in c-language.
please reply…
thank u.

By: Manas Paul

Manas Paul — Mon, 01 Mar 2010 17:12:45 +0000

Dear Avinash Sir,
This program is too good.This is my first AVR success program and LCD display program.Sir how I develop the 128×64 LCD display.Give the circuit diagram with program.I am also a customer of AVR kit.Thanks again.

By: alex

alex — Wed, 17 Feb 2010 03:23:32 +0000

I made this circuit and code in proteus for simulate it, but I can not do it. I shall apreciate if someone can send me a file in proteus. and other question is why there are many code windows when I opened in avrStudio 4?, it can simulate or I need to add every code windows? please help me, sorry I’m novice, but I’ll try to do it. thanks a lot

By: nazat shaikh

nazat shaikh — Fri, 12 Feb 2010 11:13:55 +0000

hi,
I made a project only to read DS1307 after every 1sec and for that i took your code as a reference. I checked the hardware & everything is OK, but the RTC update the time only once.Please reply…..
thank you

By: Ravi Kiran

Ravi Kiran — Sat, 06 Feb 2010 07:01:43 +0000

Hi Avinash,

I feel that there is a bug in the circuit that you have given.
In the first image(in DS1307 Circuit), it is given that the SCL pin to be connected to the SDA pin of the MCU and SDA to SCL of the MCU. But the SCL pin of an I2C device should be connected to the SCL pin of any other I2C Device. I think this is a bug and please verify the same…
Awaiting reply…..

Thank You

By: kunal

kunal — Wed, 27 Jan 2010 10:19:30 +0000

hi avinash, can you help me in interfacing atmega8 with PT2258. basicaly it’s a hometheatre project.
thanks in advance.

By: kashif ali

kashif ali — Sun, 17 Jan 2010 13:10:38 +0000

quiet brief stuff, nicely explained..!!

By: Mathivanan

Mathivanan — Fri, 15 Jan 2010 08:43:38 +0000

Great!!! Thanks…. Fully Explained ….Very nice Comments…

By: gaurav roy

gaurav roy — Thu, 10 Dec 2009 20:51:09 +0000

dude.please complete the rf communication between microcontrollers.still waiting for that………….

By: Avinash

Avinash — Tue, 17 Nov 2009 05:47:34 +0000

@Praful

When I published this project (or any other) I took GREAT CARE and try to give as much information as possible to SUCCESSFULLY make the project. I feel really pity at you that u could not make it May be some people are really too low on patience to ask at once that the thing is not working. The project is already a kind of like SPOON FEEDING a baby. I can’t do more than this.

Check the fuse bits

Check pull up resistor on SDA and SCL pins

If u don’t have enough knowledge please don’t try to be over smart and change/modify circuit and/or replace(with other value or equivalent) or remove componets

By: Praful

Praful — Tue, 17 Nov 2009 05:21:28 +0000

Dear Sir,
I made a clock as per your design and used a hex file given by you but it just shows a cursor blinking on lcd and nothing else .
I like this project and i want to do this but ………..
Please help to solve this ……………
Thanking You……………
Praful
09881303008

By: myway

myway — Mon, 02 Nov 2009 19:02:11 +0000

anyone using SW I2C on other pins like scl and sda, i need simple function for i2c_write, i2c_start, i2c_read??
thanks for help

By: Anthony

Anthony — Fri, 23 Oct 2009 14:57:48 +0000

Hi Avinash
This is my favourite Chip (DS1307)
I know it pretty Good

I give a Lib for my friend
for BCD->BIN
*sec = ((*sec & 0xF0) >> 4)*10 + (*sec & 0×0F);
*mnt = ((*mnt & 0xF0) >> 4)*10 + (*mnt & 0×0F);
*hr = ((*hr & 0xF0) >> 4)*10 + (*hr & 0×0F);
*day = ((*day & 0xF0) >> 4)*10 + (*day & 0×0F);
*year = ((*year & 0xF0) >> 4)*10 + (*year & 0×0F);
*date = ((*date & 0xF0) >> 4)*10 + (*date & 0×0F);
*mn = ((*mn & 0xF0) >> 4)*10 + (*mn & 0×0F);

for BIN->BCD
_I2C_write(((sec/10)<<4) + (sec%10));
_I2C_write(((min/10)<<4) + (min%10));
_I2C_write(((hour/10)<<4) + (hour%10));

///////////////////////////////////////////////////////////

////Read Ram
unsigned char rtc_read(unsigned char address_)
{
unsigned char data_;
_i2c_start();
_i2c_write(0xd0);
_i2c_write(address_);
_i2c_start();
_i2c_write(0xd1);
data=_i2c_read(0);
_i2c_stop();
return data_;
}

///
void rtc_write(unsigned char address,unsigned char data)
{
_i2c_start();
_i2c_write(0xd0);
_i2c_write(address);
_i2c_write(data);
_i2c_stop();
}

void rtc_init(unsigned char rs,unsigned char sqwe,unsigned char out)
{
rs&=3;
if (sqwe) rs|=0×10;
if (out) rs|=0×80;
_i2c_start();
_i2c_write(0xd0);
_i2c_write(7);
_i2c_write(rs);
_i2c_stop();
}

void rtc_get_time(unsigned char *hour,unsigned char *min,unsigned char *sec)
{
_i2c_start();
_i2c_write(0xd0);
_i2c_write(0);
_i2c_start();
_i2c_write(0xd1);
*sec=bcd2bin(_i2c_read(1));
*min=bcd2bin(_i2c_read(1));
*hour=bcd2bin(_i2c_read(0));
_i2c_stop();
}

void rtc_set_time(unsigned char hour,unsigned char min,unsigned char sec)
{
_i2c_start();
_i2c_write(0xd0);
_i2c_write(0);
_i2c_write(bin2bcd(sec));
_i2c_write(bin2bcd(min));
_i2c_write(bin2bcd(hour));
_i2c_stop();
}

void rtc_get_date(unsigned char *date,unsigned char *month,unsigned char *year)
{
_i2c_start();
_i2c_write(0xd0);
_i2c_write(4);
_i2c_start();
_i2c_write(0xd1);
*date=bcd2bin(_i2c_read(1));
*month=bcd2bin(_i2c_read(1));
*year=bcd2bin(_i2c_read(0));
_i2c_stop();
}

void rtc_set_date(unsigned char date,unsigned char month,unsigned char year)
{
_i2c_start();
_i2c_write(0xd0);
_i2c_write(4);
_i2c_write(bin2bcd(date));
_i2c_write(bin2bcd(month));
_i2c_write(bin2bcd(year));
_i2c_stop();
}

By: AVR Micro

AVR Micro — Fri, 23 Oct 2009 14:42:10 +0000

This is an excellent article! Detailed description suitable also for beginners. I will not build this project but I enjoyed a lot reading it.

By: foxit

foxit — Fri, 23 Oct 2009 09:27:32 +0000

I can not simulate this circuit in Proteus. It does not work.
I don`t understand why. Please? help.

By: Kenneth Finnegan

Kenneth Finnegan — Fri, 23 Oct 2009 06:06:30 +0000

I just finished my first project using the DS1307, and I appreciate your idea of building the complete module on perf board. I think I might go back and do that…

There is a way around needing the pull-up resistors on the clock module (at least with an ATMEGA168): Set the SCL and SDA lines high, which enables pull-up resistors inside the controller. I only know how to do this in the Arduino environment, but I do know that it’s possible.

I also used the SRAM, which was super convenient for when I wanted to be able to reset the atmega, but be able to pick up from where I left off.

http://kennethfinnegan.blogspot.com/2009/10/arduino-temperature-logger.html