Digital Clock using PIC Microcontroller and DS1307 RTC

Digital Clock using PIC Microcontroller and DS1307 RTC

A Digital Clock can be made easily by using PIC Microcontroller, DS1307 and a 16×2 LCD. I have already posted about Interfacing DS1307 RTC with PIC Microcontroller. The DS1307 RTC can work either in 24-hour mode or 12-hour mode with AM/PM indicator. It automatically adjusts for months fewer than 31 days including leap year compensation up to year 2100.  DS1307 comes with built-in power sensing circuit which senses power failures and automatically switches to back up supply. We can provide a 3V CMOS Battery for that. Communication between PIC Microcontroller and DS1307 takes place through I²C Bus.

Components Required

  • PIC 16F877A Microcontroller
  • DS1307 RTC
  • 16×2 LCD
  • 8MHz Crystal
  • 32.768KHz Crystal for RTC
  • 3V Battery
  • 2x 22pF Capacitors
  • 0.1μF Capacitor
  • 4x 10KΩ Resistors
  • 10KΩ Preset
  • 2x 2.2KΩ Resistors
  • 4.7KΩ Resistor
  • 3x Micro Switches (Push Button)
  • 5V Power Supply

Prerequisites

I recommend reading following articles before going further.

Circuit Diagram – Digital Clock

Digital Clock using PIC Microcontroller and DS1307 RTC Circuit Diagram
Digital Clock using PIC Microcontroller and DS1307 RTC – Circuit Diagram

I hope that you can easily understand the circuit diagram. The circuit is powered using a 5V power supply. 8MHz crystal is connected to PIC Microcontroller to provide necessary clock for the operation. An RCR (Resistor-Capacitor-Resistor) made using 10KΩ, 0.1µF, 4.7KΩ is connected to MCLR pin of PIC Microcontroller as recommended by Microchip. It will work fine even if you tie MCLR pin directly to VDD but Microchip doesn’t recommends it. DS1307 RTC is connected to PIC microcontroller via I2C bus. Pull up resistors connected to I2C bus is very important, please make sure that you are using correct values for it. An additional power supply (usually a battery or button cell) is connected to DS1307 RTC for running the clock during power failures. This circuit will function even without that battery also but the clock will stop and reset during power failure.

MikroC Code

// LCD module connections
sbit LCD_RS at RB2_bit;
sbit LCD_EN at RB3_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;
sbit LCD_RS_Direction at TRISB2_bit;
sbit LCD_EN_Direction at TRISB3_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections
 
unsigned short read_ds1307(unsigned short address)
{
  unsigned short r_data;
  I2C1_Start();
  I2C1_Wr(0xD0); //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0
  I2C1_Wr(address);
  I2C1_Repeated_Start();
  I2C1_Wr(0xD1); //0x68 followed by 1 --> 0xD1
  r_data=I2C1_Rd(0);
  I2C1_Stop();
  return(r_data);
}

void write_ds1307(unsigned short address,unsigned short w_data)
{
  I2C1_Start(); // issue I2C start signal
  //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0
  I2C1_Wr(0xD0); // send byte via I2C (device address + W)
  I2C1_Wr(address); // send byte (address of DS1307 location)
  I2C1_Wr(w_data); // send data (data to be written)
  I2C1_Stop(); // issue I2C stop signal
}

unsigned char BCD2UpperCh(unsigned char bcd)
{
  return ((bcd >> 4) + '0');
}

unsigned char BCD2LowerCh(unsigned char bcd)
{
  return ((bcd & 0x0F) + '0');
}

int Binary2BCD(int a)
{
  int t1, t2;
  t1 = a%10;
  t1 = t1 & 0x0F;
  a = a/10;
  t2 = a%10;
  t2 = 0x0F & t2;
  t2 = t2 << 4;
  t2 = 0xF0 & t2;
  t1 = t1 | t2;
  return t1;
}
 
int BCD2Binary(int a)
{
  int r,t;
  t = a & 0x0F;
  r = t;
  a = 0xF0 & a;
  t = a >> 4;
  t = 0x0F & t;
  r = t*10 + r;
  return r;
}

int second;
int minute;
int hour;
int hr;
int day;
int dday;
int month;
int year;
int ap;

unsigned short set_count = 0;
short set;
 
char time[] = "00:00:00 PM";
char date[] = "00-00-00";

void main()
{
  I2C1_Init(100000); //DS1307 I2C is running at 100KHz
  CMCON = 0x07;   // To turn off comparators
  ADCON1 = 0x06;  // To turn off analog to digital converters
  TRISA = 0x07;
  PORTA = 0x00;
  Lcd_Init();                        // Initialize LCD
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  // Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
  Lcd_Cmd(_LCD_BLINK_CURSOR_ON);
  Lcd_out(1,1,"Time:");
  Lcd_out(2,1,"Date:");

  do
  {
    set = 0;
    if(PORTA.F0 == 0)
    {
      Delay_ms(100);
      if(PORTA.F0 == 0)
      {
        set_count++;
        if(set_count >= 7)
        {
          set_count = 0;
        }
      }
    }
    if(set_count)
    {
      if(PORTA.F1 == 0)
      {
        Delay_ms(100);
        if(PORTA.F1 == 0)
          set = 1;
      }
      if(PORTA.F2 == 0)
      {
         Delay_ms(100);
         if(PORTA.F2 == 0)
           set = -1;
      }
      if(set_count && set)
      {
        switch(set_count)
        {
          case 1:
                  hour = BCD2Binary(hour);
                  hour = hour + set;
                  hour = Binary2BCD(hour);
                  if((hour & 0x1F) >= 0x13)
                  {
                    hour = hour & 0b11100001;
                    hour = hour ^ 0x20;
                  }
                  else if((hour & 0x1F) <= 0x00)
                  {
                     hour = hour | 0b00010010;
                     hour = hour ^ 0x20;
                  }
                  write_ds1307(2, hour); //write hour
                  break;
          case 2:
                  minute = BCD2Binary(minute);
                  minute = minute + set;
                  if(minute >= 60)
                    minute = 0;
                  if(minute < 0)
                    minute = 59;
                  minute = Binary2BCD(minute);
                  write_ds1307(1, minute); //write min
                  break;
          case 3:
                  if(abs(set))
                  write_ds1307(0,0x00); //Reset second to 0 sec. and start Oscillator
                  break;
          case 4:
                  day = BCD2Binary(day);
                  day = day + set;
                  day = Binary2BCD(day);
                  if(day >= 0x32)
                    day = 1;
                  if(day <= 0)
                    day = 0x31;
                  write_ds1307(4, day); // write date 17
                  break;
          case 5:
                  month = BCD2Binary(month);
                  month = month + set;
                  month = Binary2BCD(month);
                  if(month > 0x12)
                    month = 1;
                  if(month <= 0)
                    month = 0x12;
                  write_ds1307(5,month); // write month 6 June  
                  break;
          case 6:
                  year = BCD2Binary(year);
                  year = year + set;
                  year = Binary2BCD(year);
                  if(year <= -1)
                    year = 0x99;
                  if(year >= 0x50)
                    year = 0;
                  write_ds1307(6, year); // write year
                  break;
        }

      }
    }

    second = read_ds1307(0);
    minute = read_ds1307(1);
    hour = read_ds1307(2); 
    hr = hour & 0b00011111; 
    ap = hour & 0b00100000;
    dday = read_ds1307(3);
    day = read_ds1307(4);
    month = read_ds1307(5);
    year = read_ds1307(6);

    time[0] = BCD2UpperCh(hr);
    time[1] = BCD2LowerCh(hr);
    time[3] = BCD2UpperCh(minute);
    time[4] = BCD2LowerCh(minute);
    time[6] = BCD2UpperCh(second);
    time[7] = BCD2LowerCh(second);

    date[0] = BCD2UpperCh(day);
    date[1] = BCD2LowerCh(day);
    date[3] = BCD2UpperCh(month);
    date[4] = BCD2LowerCh(month);
    date[6] = BCD2UpperCh(year);
    date[7] = BCD2LowerCh(year);

    if(ap)
    {
      time[9] = 'P';
      time[10] = 'M';
    }
    else
    {
      time[9] = 'A';
      time[10] = 'M';
    } 
    Lcd_out(1, 6, time);
    Lcd_out(2, 6, date);
    Delay_ms(100);
  }while(1);
}

You can download the MikroC Source Code and Proteus Files etc at the end of this article. Here I explains the Source Code and different functions used in it.


The Three points to be noted while editing or creating program for this project:

  • DS1307 RTC is fully Binary Coded Decimal (BCD) clock/calender. So the data read from DS1307 should be converted to required format according to our needs and data to be written to DS1307 should be in BCD format.
  • Library for Interfacing LCD With PIC Microcontroller of MikroC needs Character or String Data. So data to be displayed in the LCD Screen should be converted to Character.
  • Addition and Subtraction cannot be directly applied on BCD. Here I first convert BCD to Binary. Then addition and subtraction can be simply applied on Binary. Then the Binary is converted back to BCD.

Functions that are used for reading and writing data from DS1307 are explained in the article Interfacing DS1307 with PIC Microcontroller please refer it. BCD2UpperCh() and BCD2LowerCh() are the two functions used to convert BCD to Character. Hour, Minute, Second, Date, Month and Year data are stored in DS1307 in separate 8-bit registers in BCD format. We read the data of these registers to access time/date. BCD2UpperCh() converts most significant 4 bits to corresponding character and BCD2LowerCh() converts least significant 4 bits to corresponding character.

The BCD2Binary() converts the BCD data read from the RTC to corresponding Binary for addition or subtraction and Binary2BCD converts the Binary back to BCD.

Bit 6 of Hour register is defined as the 24-hour or 12-hour mode selection bit.  When this bit is made high, 12-hour mode is selected and Bit 5 will represent AM/PM (Logic High represents PM).

Note : During the first setup, you might need to set the time to clock to start running.

If you have any doubts regarding the Program please do Comment.

Output

Here is the photograph of this project tested in our lab.

Digital Clock using PIC Microcontroller and DS1307 RTC
Digital Clock using PIC Microcontroller and DS1307 RTC

Download Here

You can download complete project files here.

 

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  • Plz explain how this conversion is taking place.

    int Binary2BCD(int a) //Rehman! Here ‘a’ is the given binary number
    {
    int t1, t2;
    t1 = a%10; //Rehman! This will give the 2nd digit ie right dgit
    t1 = t1 & 0x0F;
    a = a/10; //This will give the First digit i.e left digit……………………
    t2 = a%10;
    t2 = 0x0F & t2;
    t2 = t2 << 4; t2 = 0xF0 & t2; t1 = t1 | t2; return t1; }

  • Hi, Sir will you provide the header files used in this code specially for the LCD and I2C

  • Hi Ligo,
    your code is of great help.
    can you plz tell me where is the abs() function you are calling in case 3. {if(abs(set))}

    thank you

  • hey….what if I use 2 MHz crystal oscillator for the RTC? I tried to use and it isn’t working.

  • Hi they sir Ligo George!! your code was awesome :)) I would like to ask if this code can use in PIC16F887 using same code or need to modify??

  • I am facing a problem, after 11:59: 59 AM when changed to 12:00:00 PM it displayed 12:00:00 AM. After 17:59:59 AM the display shows 00:00:00 PM. Please help me

  • How to modify code to give time stroke; say at 10 it give 10 stroke/beeps at 2 it give 2 beeps . Can I use 7 segment LED in place of LCD? IF yes give detail.

  • make sure the hour register(2) in ds1307 starts in 0x40 for 12 hours mode. because this code above only works in 12 hours mode.

  • Hi ,
    I am working on pic18f45k50 with rtc ds1307zn+ and i want to display date n time . the above code is working well in proteus but when same program dumping in hardware its not showing any thing on the screen . Please let me know the modifications to be done in code and hpw to set the time n date automatically as i have not provided any switch.

    regards,
    manu

  • Thnx for such an awsome work. But has anyone noticed, the last digits cannot be set to 15 (for 2015). it goes to 14 and and down again. Please help.

  • Hi Ligo George, thanks for sharing your programming. After using your code found something abormal . After time of 12:59:59 PM ,it become 13:00:00 PM (actual must be 01:00:00 AM). Seen like setting hour part need to do something (put bit 6 of DS1307 to high for 12 hour mode).

    if((hour & 0x1F) >= 0x13)

    {

    hour = hour & 0b11100001;

    hour = hour ^ 0x20; //need to modify here

    hour = hour | 0b01100000; // or just add this line

    }

  • Hi, thanks for your programming.
    I am looking a circuit, that can control a particular device ( ie: home light) on particular time every day like alarm with long duration. Can you help me with your programming ?

  • Hi,
    I can modify connection according to PIC18F4550,So Please suggest me Code modification according to PIC18F4550.
    Regards,
    Pratik

  • Hi,

    How can I modify this code for PIC18F4550 using MickroC 2013 v6.0

    Regards,
    Pratik

  • I have a problem with this code.The problem is when the time is greater than 20 , it restart from 0 . Please help me with this problem.

  • Good day sir. Pls can you help me explain this part of he code. its not clear

    case 1:

    hour = BCD2Binary(hour);

    hour = hour + set;

    hour = Binary2BCD(hour);

    if((hour & 0x1F) >= 0x13)

    {

    hour = hour & 0b11100001;

    hour = hour ^ 0x20;

    }

    else if((hour & 0x1F) <= 0x00)

    {

    hour = hour | 0b00010010;

    hour = hour ^ 0x20;

    }

    write_ds1307(2, hour); //write hour

    break;

  • You should use 2.2K or 1.8K pull ups… otherwise RTC reading will not work properly…
    That is not the reason for LCD black boxes…
    Make sure that LCD connections are correct.. and try adjusting contrast adjusting preset.

  • Hi sir,
    is it necessary to use 2.2k as pull ups,,,im using 10k resistors….i hav a problem that my lcd,,its not working properly,,,one row of blank rectangular blocks are displayed..,,what is the problem?????

  • why this , hr = hour & 0b00011111; is used bcs second & minute directly taken pls explain.pls be kind enough to write comment difficult functions i am continuosly following your tute

  • Sir,I m trying to build this code in microc ,but it showing that variables t2 and t are eliminated by optimizer and even i dump yhe code in my controller ,it is just displaying the names time and date,nothing more than this,please help me sir

  • Hi,
    Thanks for the program
    I want to edit it and put three buttons to make an alarm, but each time I add a piece of code, the LCD flashes with date and time words without showing any date or time or doesn’t show anything at all
    so is there something I should do to make adjustment to the code or where should I put the new code segments in such a way that it won’t affect the original code and will allow the user to enter the alarm time he wants

    thanks in advance
    regards,

  • please give me codding for digital clock using pic 16f877a and ds1307

  • Hey man, can you please modify the code to run in 24 hour mode? because i don’t know how, i am not good on software, only hardware. Thanks.

  • Hi,
    I converted your code for use on my PIC32MX795F512L chip but all I get is ? for time and date. I have RTC2 with 1307 RTC on SDA1 – RA15 and SCL1 on RA14. I’m not using the EEPROM so there should not be a conflict. I have RA14 and RA15 pulled high. I am using a mikroElecktronika Fusion 7 development board.
    Any Ideas?
    Thanks
    Sid
    // LCD module connection EasyPic Fusion V7 PIC32MX795F512L
    sbit LCD_RS at LATD9_bit;
    sbit LCD_EN at LATD10_bit;
    sbit LCD_D4 at LATE4_bit;
    sbit LCD_D5 at LATE5_bit;
    sbit LCD_D6 at LATE6_bit;
    sbit LCD_D7 at LATE7_bit;

    sbit LCD_RS_Direction at TRISD9_bit;
    sbit LCD_EN_Direction at TRISD10_bit;
    sbit LCD_D4_Direction at TRISE4_bit;
    sbit LCD_D5_Direction at TRISE5_bit;
    sbit LCD_D6_Direction at TRISE6_bit;
    sbit LCD_D7_Direction at TRISE7_bit;
    // End LCD module connections

    unsigned short read_ds1307(unsigned short address)
    {
    unsigned short r_data;
    I2C1_Start();
    I2C1_Write(0xD0); //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 –>0xD0
    I2C1_Write(address);
    I2C1_Restart();
    I2C1_Write(0xD1); //0x68 followed by 1 –> 0xD1
    r_data=I2C1_Read(0);
    I2C1_Stop();
    return(r_data);
    }

    void write_ds1307(unsigned short address,unsigned short w_data)
    {
    I2C1_Start(); // issue I2C start signal
    //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 –> 0xD0
    I2C1_Write(0xD0); // send byte via I2C (device address + W)
    I2C1_Write(address); // send byte (address of DS1307 location)
    I2C1_Write(w_data); // send data (data to be written)
    I2C1_Stop(); // issue I2C stop signal
    }

    unsigned char BCD2UpperCh(unsigned char bcd)
    {
    return ((bcd >> 4) + ‘0’);
    }

    unsigned char BCD2LowerCh(unsigned char bcd)
    {
    return ((bcd & 0x0F) + ‘0’);
    }

    int Binary2BCD(int a)
    {
    int t1, t2;
    t1 = a%10;
    t1 = t1 & 0x0F;
    a = a/10;
    t2 = a%10;
    t2 = 0x0F & t2;
    t2 = t2 <> 4;
    t = 0x0F & t;
    r = t*10 + r;
    return r;
    }

    int second;
    int minute;
    int hour;
    int hr;
    int day;
    int dday;
    int month;
    int year;
    int ap;

    unsigned short set_count = 0;
    short set;

    char time[] = “00:00:00 PM”;
    char date[] = “00-00-00″;

    void main()
    {
    I2C1_Init(100000); //DS1307 I2C is running at 100KHz

    CHECON = 0x32; // Prefetch cache pic32mx
    AD1PCFG = 0xFFFF; // Configure AN pins as digital I/O pic32mx

    TRISA = 0x07;
    PORTA = 0x00;

    Lcd_Init(); // Initialize LCD
    Lcd_Cmd(_LCD_CLEAR); // Clear display
    Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
    Lcd_out(1,1,”Time:”);
    Lcd_out(2,1,”Date:”);

    do
    {
    set = 0;

    if(PORTA.F0 == 0)
    {
    Delay_ms(100);

    if(PORTA.F0 == 0)
    {
    set_count++;
    if(set_count >= 7)
    {
    set_count = 0;
    }
    }
    }
    if(set_count)
    {
    if(PORTA.F1 == 0)
    {
    Delay_ms(100);
    if(PORTA.F1 == 0)
    set = 1;
    }

    if(PORTA.F2 == 0)
    {
    Delay_ms(100);
    if(PORTA.F2 == 0)
    set = -1;
    }
    if(set_count && set)
    {
    switch(set_count)
    {
    case 1:
    hour = BCD2Binary(hour);
    hour = hour + set;
    hour = Binary2BCD(hour);
    if((hour & 0x1F) >= 0x13)
    {
    hour = hour & 0b11100001;
    hour = hour ^ 0x20;
    }
    else if((hour & 0x1F) = 60)
    minute = 0;
    if(minute = 0x32)
    day = 1;
    if(day 0x12)
    month = 1;
    if(month <= 0)
    month = 0x12;
    write_ds1307(5,month); // write month 6 June
    break;
    case 6:
    year = BCD2Binary(year);
    year = year + set;
    year = Binary2BCD(year);
    if(year = 0x50)
    year = 0;
    write_ds1307(6, year); // write year
    break;
    }
    }
    }

    second = read_ds1307(0);
    minute = read_ds1307(1);
    hour = read_ds1307(2);
    hr = hour & 0b00011111;
    ap = hour & 0b00100000;
    dday = read_ds1307(3);
    day = read_ds1307(4);
    month = read_ds1307(5);
    year = read_ds1307(6);

    time[0] = BCD2UpperCh(hr);
    time[1] = BCD2LowerCh(hr);
    time[3] = BCD2UpperCh(minute);
    time[4] = BCD2LowerCh(minute);
    time[6] = BCD2UpperCh(second);
    time[7] = BCD2LowerCh(second);

    date[0] = BCD2UpperCh(day);
    date[1] = BCD2LowerCh(day);
    date[3] = BCD2UpperCh(month);
    date[4] = BCD2LowerCh(month);
    date[6] = BCD2UpperCh(year);
    date[7] = BCD2LowerCh(year);

    if(ap)
    {
    time[9] = ‘P’;
    time[10] = ‘M’;
    }
    else
    {
    time[9] = ‘A’;
    time[10] = ‘M’;
    }

    Lcd_out(1, 6, time);
    Lcd_out(2, 6, date);
    Delay_ms(100);

    }while(1);
    }

  • hie there you have a nice working code, may you please add uart interface to let the user correct time using the computer…..please sir

  • Hi Ligo, first of all this is a very good project, well done.

    I have one problem with it. When I want to bush a button, or just put my finger close to the circuit, the time and date values from DS1307 changes to “?”.on the LCD. The fix datas from PIC stays stable(“Time”,”Date”). I try almost everything, but I could’nt solve this problem. The clock is running well and the LCD shows good values, until I don’t put my hand close to the cicuit. But when i tap the gnd somwhere it’s get stable???

    Do You have some advice, or tip?

    Thank You

  • thank you very much the project is working perfect…..but if i switch of the power and on it again the clock starts from the default, but it shouldnt bcos of the ds1307, or am confusing the function of ds1307?

  • also i dont see any capacitor connected to the pic and also no crystal connected to the ds1307..

  • what is 12c bus is it the same thing as ds1307? and also u connect a resistor to pin1 of the pic what is the value?

  • 1. 10K resistors are used as PULL UP resistors… When the switch is not pressed.. the input pin of PIC will read it as HIGH… When the switch is pressed it becomes LOW..

    2. 10K Variable Resistor is used to adjust the contrast of the LCD

    3. 2.2K resistors are used as the PULL UP resistors for I2C Bus.. SCL and SDA are open collector outputs..

  • I used 8MHz..
    You needn’t any header files.. Those functions are predefined in the MikroC Pro Compiler.. .. You may change the crystal frequency in the MikroC Project Settings..

  • please from the schematic above am seeing one 10k variable resistor, three 10k resistor, and two 22k resistor, but from what you implemented above i mean the picture you took above, am seein more than the number of resistors theirs one additional resistor am seeing in the picture please can you tell me why and how comes?

  • SORRY I WANT TO ASK IF LCD HAVE ANY COMMAND THAT IS INCLUDED IN THE DIRECTORY

  • ok, but it will be better if theres a video, for better illustration….so i can follow the video…

  • It is difficult to explain.. please see the datasheet of DS1307… and see the hour register……
    All bits of hour register are not used to indicated the value of hour…

  • Sir, i would like to know how to generate a PWM signal with duty-cycle adjustment according to real time. Can i use the DS1307 RTC??

  • DS1307 is a BCD clock.. but .. C operators are decimal.. that steps are used to convert decimal to bcd.. and the if conditions checks for upper and lower limits of hour…
    similarly in case 6 it checks for upper and lower limits of year … not year>=50.. it is year>=0x50

  • I’m sorry but i felt weird when i looked the program and tried to extract the procedure of setting hour mode and AM/PM.I didn’t get case:1 for set_count and condition(year>=50) in case :6.
    I urgently need help !

  • Sir, I’m asking help from you. i’m a graduating student but my problem is my thesis. it is a time based project.. i would like to ask some help that deals with time and uses pic16F877a. thank you

  • sir, I would like to ask some help about setting the time in the ds1307 using keypad, can you help me sir?

  • Krishnappa Gururaj please can u help me build this project on pcb i want to buy it from you..thanks..

  • Sir I didn’t get the logic behind Changing HOUR mode and AM/PM indication.
    Will you elaborate, please !!!

  • Sorry… I am very busy… Try searching for someone near to you…
    Give the above circuit diagram and codes to someone who have experience with project development….

  • only to india? please i will pay the shipping fee….i dont mind the cost…i need it very urgent…

  • Can you said for me practically ,at the first switch on to the curuit what will be displayed?

    thank you very much for your help

  • Sorry… now we have a lot of server problems… please try now…
    .. If it is not working… give me your mail id.. I will mail you..
    sorry for the inconvenience caused..

  • I want to down load the file also and the button up doesn’t work, help me please or send it to my email .

  • honestly i dont know how to use micro c, i use pic c compiler, i try download micro c am having problem with it, if u dont mind doing this project for me on a pcb board i want to buy it and defend it for my final year project by december please..am ready to pay all the cost..

  • Please try it yourself….
    1. Open the MikroC Project
    2. Go to Project >> Edit Project
    3. Change the MCU name to 16F877
    4. Build >> Rebuild
    Now your new hex file will be generated..

  • Hi Ligo,

    I need your suggestion to make my project success,

    In my project i am using PIC16F72, monitoring(RB0) a signal from RF transmitter and its comes once in 10Sec of 1 Sec width. I need to run my code until RF signal present. If RF signal not received with in 15 sec code should not run further. How can i use the interrupts in this case

    Please help me

  • That errors are simple syntax errors….. check syntax errors in your program……

    and all the code should be written in that while loop… not outside it… even though it is not a syntax error…

  • sir,, i wrote the program you give to me…is that need to wrote if(8:00:00) after clock program or any specific column? for example

    }while(1);

    if(8:00:00)

    when i run, the error said 260 406 ‘)’ expected, but ‘:’ found ..

    can you explain more details to me..

  • hello sir,
    i want to display the numbers from 1 t0 1000 in pic16f690 in LCD but it is not displaying.can you give some ideas to work with ascii characters

  • sorry can the hex file work for microcontroller 16f877 because i cant get microcontroller 16f877A here. thanks

  • Dear sir,
    I am planning to buy pic compiler which compiler you suggest mikro c or Hi tech c.
    Thanking you
    with regards
    Gururaj

  • I thing your circuit might have a short circuit… Please recheck the whole wiring………
    Note that the you should press and hold the switch for some time (less than 500ms) to work…

  • hi sir! thats a nice project, 🙂 sir how can i identify if my rtc is really working or damaged?.. i did ur project and it really works, but on the second time around, i cannot set the corresponding time, the switches are not working and my rtc became very hot.. what should i do?..

  • i download it but i need hexfile pls send the hexfile only to my mail please.

  • I already said that .. you should split the delay of motor rotation as I indicated in the previous algorithm.. otherwise the time updation process will be interrupted..

  • but i want to use this program..how to combine it as i said before?? and the button to set,up and down still doesn’t working after i change the delay of button..
    void main()
    {
    TRISD = 0; // PORT B as output port
    PORTD = 0; // Set RB0 to high
    do
    {
    // To turn led
    PORTD.F7 = 1;
    Delay_ms (10000); //10 seconds delay
    // To off led
    PORTD.F7 = 0;
    // To turn motor clockwise
    PORTD.F0 = 1;
    PORTD.F1 = 0;
    Delay_ms (1000); //1 seconds delay
    // To stop motor
    PORTD = 0; // PORTB = 3
    Delay_ms (1000);
    // To turn motor anticlockwise direction
    PORTD.F0 = 0;
    PORTD.F1 = 1;
    Delay_ms (1000);
    // To Stop motor
    PORTD = 0; // (3=0b00000011)
    Delay_ms (1000);
    // To turn motor clockwise
    PORTD.F2 = 1;
    PORTD.F3 = 0;
    Delay_ms (1000); //1 seconds delay
    // To stop motor
    PORTD = 0; // PORTB = 3
    Delay_ms (1000);
    // To turn motor anticlockwise direction
    PORTD.F2 = 0;
    PORTD.F3 = 1;
    Delay_ms (1000);
    // To Stop motor
    PORTD = 0; // (3=0b00000011)
    Delay_ms (1000);
    }while(0);
    }

  • just use if conditions …and splitting the delay…(to avoid interruption in the lcd display)
    if(requied time)
    {
    flag = 50;
    }
    if(flag>0)
    {
    LED ON;
    SMall delay, 100ms
    }
    else
    LED OFF;
    flag = flag – 1;

    thus when the time is reached.. led will be ON for about 5 seconds (50x100ms)

  • yes..i have tried and it is working..thank you…but,how i want to combine my motor and led program with this clock? for example, i want the led on for 5 seconds and then the motor is moving for 10 seconds when the clock is at 8:00 a.m, 1:00 p.m and 9:00 p.m ??

  • sir, i want to combine two shematics: digital clock and digital thermometer. i adjusted the shematic(in proteus) fot adding lm35, the buttons are now in portd(porta.ra0 for lm35) and i maked the right setting for activating analog imput, But i dont know where in program of clock to add the thermometer sequence. i’ve tried tu use external interupt orTMR0 fot interupt routine but didnt work. were in program can i put the thermometer sequence? is something else to add?

  • i found it, button must be pressed much longer than usual because of “delay”, in proteus, i think…… 🙂

  • sir, why button doesnt work? when i push each button nothig happen. but clock is running, in proteus i mean.

  • Did you tried my project files..?? It is 100% working in proteus and hardware….. You needn’t connect I2C debugger if you are using correct pull up resistors… Use resistors that labeled PULL UP in proteus libraries.. check… Check stage by stage instead of testing it after wiring the whole circuit… fist time… then add motor.. etc..

  • i am using your micro c code,but lcd only display character “Time:” and “Date:” only…can you help me to correct the code and solve my problem to make this simulation successful? i really need your help…i am using pic16f877 and crystal 11.0592Mhz…

  • I have this error when compile c: “Error 128 dc.c, Line 2(1,3): A #DEVICE is required before this line”

  • DS1307 is a BCD (Binary Coded Decimal) Clock.. so you should write hours as BCD..6th bit of the hour register determines whether the clock is 12/24 hour….. and 5th bit determines whether it is AM or PM when it is running in 12 hour mode…
    The program given along this article is 100% working…

  • What are the values that has to be written to hours register if 12 hour format is selected. Mention all the values for 12 AM to 11 AM and 12 PM to 11 PM

  • This code is meant for PIC 16F877A not for PIC 16F877 and the compiler used here is MikroC. If you want to use 16F877, I hope that no code modifications are required but you should compile it after changing the microcontroller in project settings…

  • Dear Sir,

    First, thanks for your explanations.

    I tried to use your code on pic16F887 (instead of 877) it gives me compilation error on include library – include p16f887.inc (line 4)

    I tried to eraze this line,finaly looking on my LCD I don’t see anything (resistors forSDA and SCL attached).

    I use as power an old Nokia charger (5v output)

    Can you , please, help me

  • Hi, thanks. I read that Li ion batteries doesn’t have to go below certain voltage 3.2v aprox to prevent over discharge, so i think i need some under voltage lockout circuit to prevent that.. or not?

  • Use PIC 16LF877A, a lower voltage version of pic 16f877a…. It can work at 3.7V…. For operating LCD, you can drop about 0.7V by connecting a 1N4007 diode in series..

  • Hi thank you very much, your website is awesome, i would like to feed this circuit with a 3.7v battery using a 3v LCD, but I’ve search a lot on internet regarding PIC’s on batteries but there’s little information about that, every one wants to use voltage regulators but that’s very inefficient, i think using a 3.7 v battery would be the best approach but there’s almost no information about the considerations of doing that, what do you think?

  • Ligo, absolutely amazing circuits with great explanation. This is one of the best site in digital electronics world. It’s a great service to the community. Well Done!!!

  • i need this project .but i need a lil modification to it ,,, if u can help me with this i will be thank full to u …
    i need an additional output port which will be triggered from 8.00 am to 8.00 pm or 8.00-20.00hrs

    i need to trigger a 5v relay with the time ..
    if any1 can help please i m not into programming but if i get the code and hex with crt diagram i will be thankfull

  • i need this project .but i need a lil modification to it ,,, if u can help me with this i will be thank full to u …
    i need an additional output port which will be triggered from 8.00 am to 8.00 pm or 8.00-20.00hrs

    i need to trigger a 5v relay with the time ..
    if any1 can help please i m not into programming but if i get the code and hex with crt diagram i will be thankfull

  • sir clock work perfectly.thanks for your help.sir i try to make 60 led (circle led indicate second) clock and led drive with 74hc595 but 60 led not indicate anything. how to write in mikro c code for this(led on one by one according to second). hope your help.

  • You can use while or.. do while.. for making infinite loop.. It will not affect the program..
    The only difference between them is.. condition is checked before entering the loop in while() .. but in.. do..while() .. it is checked after the execution of the segment…. The program segment will execute once in do..while() even if the condition is false..

  • thank you sir for your reply, i write your clock code under the while loop.i dont use do-while loop.that is affect my programme?what is the different of do-while and while?

    but my code work in proteus.

  • Did you connected Vdd and Vss of pic microcontroller which are not shown in the above circuit diagram?
    First check your pic by doing LED blinking..

  • no pic out put signal.i write PORTD.F0=1; like code with clock code after power supply i check the F0 pin it is no out put signal.kindely help me.

  • It is 100% working.. we have tested it… In the first time.. the default time will be 00-00-80. .. and the clock will not be running..
    We want to reset the second, to make the clock running..
    What is the output of your hardware..??

  • Sir ,make your clock and pic 16f877a does not out put in hardware.why? sir can read ds1307 without write time ,date, in first time.

  • 1st click on the set button.. then use other buttons to adjust hour… then click on the set button again.. then use other buttons to adjust minute… and so on..

  • hye sir..sorry for interrupting..
    Sir can u send me the hex file?It is because the existing hex file not working in my proteus.

  • sorry sir. resistor that connected with pin 5 and pin 6 at DS1307. For crystal value is it okay If I used 20 000 H for both IC?

  • what about the resistor at DS1307. Which resistor that i should use?Is it okay if I use 20 KH for crystal value.

  • There is no connection between 5 and 6… check the pull up resistors that you have used for SCL (6) and SDA (5). Use 2.2K or 1.8K…

  • hello sir..

    i have construct the circuit in stripboard. When I put the IC and test the circuit, I found that the circuit didn’t work. When I press the push button there is no output in the lcd. I have troubleshoot the circuit and I found that there is connection at DS1307, between pin 5 and pin 6. I have reconstruct the circuit and the problem is still same. Can u give me the opinion how to solve the problem? Hope u can help me.

  • yes sir,it is proteus problem.proteus animating time depend on animating options frames per second value.sorry for my mistake.your project is very useful.

    To GAZ; change the frame value and run the project 🙂

  • It is working fine on my proteus.. It may the problem with proteus version.. I am using 7.10 ….. Just try after changing the value of I2C pull up resistors to 1.8K or 2.2K..

  • sir, i download your new zip file and it running slowly than normal time.please kindly help me and re-post the proteus design.

  • You are welcome..
    It is running real time in my laptop… When did you download the zip file?
    Before a month there is a problem with the proteus design.. and I corrected it…
    Check the proteus: Which are the Pull Up resistors connected to SCL and SDA ?…. use 2.2K or 1.8k…. in proteus better to use the PULL UP resistor from their library…

  • the time on this project it not running same like real time
    seconds on this projects is running very slowly when we copare it with the clock of my house or my laptop and later it will effect the minutes my question is can you try to make seconds running like real time
    and thank you again because you are the only one who answer my stupid questions

  • thank you sir its ikay now
    but when i copare seconds of this project and seconds on my laptop i see that theres a differnce and thats can effect the shown time can you correct it please to make no difference between this RTC and all otherRTC??

  • done sir..thank you..by the way how do you set the rtc into 12hr mode??im having a hard time understanding the 6bit and 5bit of the registers..

  • Sir, is it possible to take control of a specific interval of time in ds1307?(example) i want my device to be checking a sensor from 9:00:00am until 1:00:00pm..i want that my sensor should recognize the 4hr- time interval on which it would be checked over and over by the system..plss help me,thank you very much.

  • Ok sir..as in store the time date data of ds1307?im still newbie with this EEPROM,ill try it out,hope it will work.thank you very much.ill post an update later..

  • Ah, i see..but can i store (example) a minute data in EEPROM?and later i will retrieve the minute data and compare it with the another one? is EEPROM capable of storing the time data of the ds1307?..thank you very much again mr. george!

  • This is the first time output when you power the clock….. Check connections of switches… When you reset the second to 00 the clock will start running..

  • ok i’ll try..i didn’t succeed with my other experiment with storing the minute, and i realized maybe i could use this CCP module..but im a little bit confused because it says there that it uses the internal timer of pic..now ill try expermenting it with the ds1307..if you have any sample programs for these hope you can help me..thanks.

  • Sir. how can I message you privately so that you can see my code It’s kind a long when I post it here…?

  • I think you can use vs1307. Error may be due to noise…. Try shortening the distance from PIC to RTC.
    Which are the pull up resistors that you used?

    You should use 2.2K or 1.8K…

  • hi sir. is it possible to replace ds1307 with vs1307. i looked up the pin config of the two and it’s just sam bu when i tried to use it the lcd, it only display (Time:10:=0:=0 AM) (Date:=0-=0-=0)

  • Yes, I’ll work on real hardware but the output is the same, not blinking when setting the HH:MM:SS, MO/DD/YR.

  • ………………………………

    void main()
    {
    IC1_Init(100000); //DS1307 I2C is running at 100KHz
    CMCON = 0x07;
    TRISD = 0x0F;
    PORTD = 0x00;
    TRISB.F0 = 0;
    Lcd_Init(); // Initialize LCD
    Lcd_Cmd(_LCD_CLEAR); // Clear display
    Lcd_Cmd(_LCD_BLINK_CURSOR_ON); // Blink Cursor
    Lcd_out(1,1,”TIME:”);
    Lcd_out(2,1,”DATE:”);

    ………………………………
    if(set_count && set)
    {
    switch(set_count)
    {
    case 1:
    hour = BCD2Binary(hour);
    hour = hour + set;
    hour = Binary2BCD(hour);
    Lcd_Cmd(_LCD_FIRST_ROW);
    Lcd_Cmd(_LCD_MOVE_CURSOR_RIGHT);
    if((hour & 0x1F) >= 0x13)
    {
    hour = hour & 0b11100001;
    hour = hour ^ 0x20;
    }
    else if((hour & 0x1F) <= 0x00)
    {
    hour = hour | 0b00010010;
    hour = hour ^ 0x20;
    }

    write_ds1307(2, hour); //write hour
    break;

    …………..

    that's my code and still not working…

  • Still not blinking. First I Use the command _LCD_BLINK_CURSOR_ON and put the _LCD_MOVE_RIGHT.

  • Lcd_Cmd(_LCD_CURSOR_OFF); ,,
    Use other cursor control commands…
    _LCD_FIRST_ROW –
    Move cursor to the 1st row_LCD_SECOND_ROW
    – Move cursor to the 2nd row

    _LCD_BLINK_CURSOR_ON –
    Blink cursor on

    _LCD_MOVE_CURSOR_LEFT
    – Move cursor left without changing display data RAM

    _LCD_MOVE_CURSOR_RIGHT
    – Move cursor right without changing display data RAM

    For using EEPROM..you can use mikroc functions.. Eeprom_read() and Eeprom_write() …
    http://www.electrosome.com/internal-eeprom-pic-microcontroller/

  • I tried that before my cursor blink at end of the date, basically it appear in 2nd row, 9th col. do you have a simple example of EEPROM. if I’m mistaken it is like NVRAM store data when the power is lost. BTW thank you! 😀

  • Try after removing Lcd_Cmd(_LCD_CURSOR_OFF);
    from the code…..

    For setting alarm you may store the time in PICs EEPROM, and compare with time reading from RTC..

  • ok thank you, question sir. how can I see the cursor while doing the setting mode in LCD and how can I set an alarm in ur prog.

  • Instead of using of 2 buttons for increment and decrement can I use 4×3 keypad in your code? BTW thank you to your site I learned alot. 😀

  • previousMin = minute; this statement wil execute more than one time when f4 & f5 of portb are high….. It should be executed once to work this program correctly…. ..

  • Sir..i just tried a piece of code,but it does not work..pls inspect:

    ////////code//////////////////////////

    if(PORTB.F4 == 1 && PORTB.F5 == 1)
    {
    minute = read_ds1307(1); //i tried to read the time where the 2 ports where high
    previousMin = minute; ///stored min to previous
    Lcd_cmd(_LCD_CLEAR);
    Lcd_out(1, 1, “detected”);
    delay_ms(1000);
    if(PORTB.F4 == 1 && PORTB.F5 == 1)///check again if the ports are high
    {
    minute = read_ds1307(1); //read again the minute
    currentMin = minute;//stored the minute to current
    if(previousMin != currentMin && (PORTB.F4 == 1 && PORTB.F5 == 1)) //compare the 2 variables and check 2 ports state
    {
    counterM++; //increment the counter
    if(PORTB.F4 == 1 && PORTB.F5 == 1) //check again the ports
    {
    if(counterM == 2) ///check the value of counter
    {
    Lcd_cmd(_LCD_CLEAR);
    Lcd_out(1, 1, “overloaded”);
    delay_ms(2000);
    //break;
    }
    }
    }
    }
    }
    //////////end of code/////////////////

    pls help me..i really wasn’t sure with the part (minute = read_ds1307(1))..pls help me,.thank you..

  • thank you sir..i’ll do it again..hope this time it will work..ill update again with the progress..thank you very much!

  • it doesn’t seem to work..i tried storing minute in 2 separate variables like what you said..here’s what im trying to do..example..if a pin goes high at 9:00:00, i will store 00min in a variable and if it changes to 01,and the pin is still in high state, a counter variable will increment(count++),..my problem is how will i know if the minute has already changed from 00 to 01?,,im really confused..i tried what u said, but not working..(maybe i did not do it correctly)..please help me..thank you.

  • it doesn’t seem to work..here is what im trying to do..example: if a port is high at 9:00:00, i want to store the 00min in a variable and when it changes to 01 and the port is still in high state, a counter variable will increment(count++)..my problem is how will i know if the minute has already changed from 00 to 01?i tried storing minutes in separate variables but it seems like it does not recognize the minute data i stored..please help me…thanks.

  • i already did..i tried storing minute in a separate variable..(like j = minute..) but im confused how to count the next change of minute.,sorry if you dont understand my question..i want to make a counter variable which will increment everytime the value of minute changes..i’m really confused..please help me..thanks..

  • Hey mr. George,,thanks again with the help..will you please help me again,i would like to count every change of minute on the time..but i’m confused how to make a somewhat like counter variable which will hold/count the value of the change in minute..ex,time is 9:00:00..if min became 01..the counter should count 1..and so on..please help me..thanks…

  • Sir, Now its working. but not the correct way. I have tried to put the”hr” variable in Bcd2dec(hr) instead of direct reading from RTC and then made portB.F7=1; and its now working. But then is the data from RTC is not BCD? or “hr” variable is BCD? I did’nt understood! I guess in hr = hour & 0b00011111; you are masking some bits of BCD…

  • Sir..it worked!!thank you very much..just want to ask,how do you configure the clock to be 12-hour clock not 24 hour clock? thank you..

  • sir here is the modified code: sir I have tried your code with PIC16f628A using soft I2C and was succesful. But not working what I am trying.

    // Software I2C connections

    sbit Soft_I2C_Scl at RB4_bit;

    sbit Soft_I2C_Sda at RB1_bit;

    sbit Soft_I2C_Scl_Direction at TRISB4_bit;

    sbit Soft_I2C_Sda_Direction at TRISB1_bit;

    // End Software I2C connections

    // LCD module connections

    sbit LCD_RS at RB0_bit;

    sbit LCD_EN at RA1_bit;

    sbit LCD_D4 at RB2_bit;

    sbit LCD_D5 at RB3_bit;

    sbit LCD_D6 at RB5_bit;

    sbit LCD_D7 at RB6_bit;

    sbit LCD_RS_Direction at TRISB0_bit;

    sbit LCD_EN_Direction at TRISA1_bit;

    sbit LCD_D4_Direction at TRISB2_bit;

    sbit LCD_D5_Direction at TRISB3_bit;

    sbit LCD_D6_Direction at TRISB5_bit;

    sbit LCD_D7_Direction at TRISB6_bit;

    // End LCD module connections

    sbit Sett at RA2_bit;

    sbit Inc at RA3_bit;

    sbit Dec at RA4_bit;

    unsigned short read_ds1307(unsigned short address)

    {

    unsigned short r_data;

    INTCON.GIE=0;

    Soft_I2C_Start();

    Soft_I2C_Write(0xD0); //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 –> 0xD0

    Soft_I2C_Write(address);

    Soft_I2C_Start();

    Soft_I2C_Write(0xD1); //0x68 followed by 1 –> 0xD1

    r_data=Soft_I2C_Read(0);

    Soft_I2C_Stop();

    return(r_data);

    INTCON.GIE=1;

    }

    void write_ds1307(unsigned short address,unsigned short w_data)

    {

    INTCON.GIE=0;

    Soft_I2C_Start(); // issue I2C start signal //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 –> 0xD0

    Soft_I2C_Write(0xD0); // send byte via I2C (device address + W)

    Soft_I2C_Write(address); // send byte (address of DS1307 location)

    Soft_I2C_Write(w_data); // send data (data to be written)

    Soft_I2C_Stop(); // issue I2C stop signal

    INTCON.GIE=1;

    }

    unsigned char BCD2UpperCh(unsigned char bcd)

    {

    return ((bcd >> 4) + ‘0’);

    }

    unsigned char BCD2LowerCh(unsigned char bcd)

    {

    return ((bcd & 0x0F) + ‘0’);

    }

    /** Bcd2Dec**/

    unsigned short Bcd2Dec(unsigned short bcdnum) {

    unsigned short tmp = 0;

    tmp = (bcdnum >> 4) * 10;

    tmp += (bcdnum & 0x0F);

    return tmp;

    }//

    int Binary2BCD(int a)

    {

    int t1, t2;

    t1 = a%10;

    t1 = t1 & 0x0F;

    a = a/10;

    t2 = a%10;

    t2 = 0x0F & t2;

    t2 = t2 <> 4;

    t = 0x0F & t;

    r = t*10 + r;

    return r;

    }

    int second;

    int minute;

    int hour;

    int hr;

    int day;

    int dday;

    int month;

    int year;

    int ap;

    unsigned short set_count = 0;

    unsigned short set;

    unsigned short i;

    unsigned short Dhour;

    unsigned short Hcnt;

    char time[] = “00:00:00 PM”;

    char date[] = “00-00-00″;

    void Check_time() //here I am converting bcdtodec

    {

    Hcnt=read_ds1307(2);

    Dhour=Bcd2Dec(Hcnt); //saving the value in variable

    }

    unsigned short counter;

    void interrupt(){

    if (INTCON.T0IF) {

    if (counter >= 20) {

    Soft_I2C_Break();

    counter = 0; // reset counter

    }

    else

    {

    counter++; // increment counter

    INTCON.T0IF = 0; // Clear Timer0 overflow interrupt flag

    }

    }

    }

    void main()

    {

    CMCON = 0x07; // To turn off comparators

    // ADCON1= 0x06; // To turn off analog to digital converters

    TRISA = 0b00011100;

    TRISB = 0x00;

    //ANSEL=0;

    OPTION_REG=0x07;

    INTCON=0b10100000;

    PORTB.RB7=0;

    Lcd_Init(); // Initialize LCD

    Lcd_Cmd(_LCD_CLEAR); // Clear display

    Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off

    Lcd_out(1,1,”Time:”);

    Lcd_out(2,1,”Date:”);

    Soft_I2C_Init(); // Initialize Soft I2C communication

    do{

    set = 0;

    if(Sett == 0)

    {

    Delay_ms(100);

    if(Sett == 0)

    {

    set_count++;

    if(set_count >= 7)

    {

    set_count = 0;

    }

    }

    }

    if(set_count)

    {

    if(Inc == 0)

    {

    Delay_ms(100);

    if(Inc == 0)

    set = 1;

    }

    if(Dec == 0)

    {

    Delay_ms(100);

    if(Dec == 0)

    set = -1;

    }

    if(set_count && set)

    {

    switch(set_count)

    {

    case 1:

    hour = BCD2Binary(hour);

    hour = hour + set;

    hour = Binary2BCD(hour);

    if((hour & 0x1F) >= 0x13)

    {

    hour = hour & 0b11100001;

    hour = hour ^ 0x20;

    }

    else if((hour & 0x1F) = 60)

    minute = 0;

    if(minute = 0x32)

    day = 1;

    if(day 0x12)

    month = 1;

    if(month <= 0)

    month = 0x12;

    write_ds1307(5,month); // write month 6 June

    break;

    case 6:

    year = BCD2Binary(year);

    year = year + set;

    year = Binary2BCD(year);

    if(year = 0x50)

    year = 0;

    write_ds1307(6, year); // write year

    break;

    }

    }

    }

    second = read_ds1307(0);

    minute = read_ds1307(1);

    hour = read_ds1307(2);

    hr = hour & 0b00011111;

    ap = hour & 0b00100000;

    dday = read_ds1307(3);

    day = read_ds1307(4);

    month = read_ds1307(5);

    year = read_ds1307(6);

    time[0] = BCD2UpperCh(hr);

    time[1] = BCD2LowerCh(hr);

    time[3] = BCD2UpperCh(minute);

    time[4] = BCD2LowerCh(minute);

    time[6] = BCD2UpperCh(second);

    time[7] = BCD2LowerCh(second);

    date[0] = BCD2UpperCh(day);

    date[1] = BCD2LowerCh(day);

    date[3] = BCD2UpperCh(month);

    date[4] = BCD2LowerCh(month);

    date[6] = BCD2UpperCh(year);

    date[7] = BCD2LowerCh(year);

    if(ap)

    {

    time[9] = ‘P’;

    time[10] = ‘M’;

    }

    else

    {

    time[9] = ‘A’;

    time[10] = ‘M’;

    }

    Lcd_out(1, 6, time);

    Lcd_out(2, 6, date);

    Delay_ms(50);

    Check_time(); //here i am checking time

    if(Dhour==11) //if its 11 then make RB7=1

    {

    PORTB.RB7=1;

    }

    }while(1);

    }

    but its not working

  • Ok sir..thanks,i’ll try fixing it again,hopefully it would work now..thank u very much for the help..i already made the I2C lines shorter,,about 1.5 inch now..by the way with your code in converting BCD, do i still have to change anything there coz im using a pic18f4550(4mhz crystal)..and in your proj you used a pic16f..thanks,

  • It may be due to noise, these devices are very sensitive to noise. First make your power supply free of noise by adding filtering capacitors………. Shorten the distance of I2C lines and place it close to pic microcontroller..

  • sir..i wasn’t able to come up with the output you were saying earlier (00-00-80) the time and date displays on the lcd as soon as i plug it in with a supply..but the time and date was not stable,.keep on changing almost every second. plss help..thanks..

  • sir I have set light to 0 or off and then burned the program but its again on always but not at that time!

  • I didn’t turn off the light first I am trying to make just a routine which will check time and if it matches the routine time then it should make the “light” to logic one. but its always on!

  • Ok sir..thank you very much..by the way what is the value of the 3 pull ups on the switches and the Var Resistor? i followed the value on your proteus design, thanks again for the help.

  • Ok sir..i’ll try it then..ill update again if i encounter problems..thank you very much,.i had a wire connection for SCL &SDA almost 12inches..is it ok?

  • You may use a good power supply,,,,,,,, or Try after adding a 100uF capacitor near to pic microcontroller to filter ac voltages…

    Keep the length of I2C (SCL & SDA) between pic and RTC as minimum as possible…

  • Yes, i used 1.8K resistor as pull ups for my SCL and SDA..im curious because when i use PICkit2 as a supply voltage,it displays time but not stable (the time and date changes almost every second) and as i said earlier when i supply it with an external power supply for my actual hardware,the time doesn’t appear anymore..thanks by the way for the help..i’ll try checking again my pin connections. thank you.

  • Check your LCD data pins connections…… interchanging data pins results in unexpected characters…
    Pull UP resistors of SCL and SDA should be close to 2K…..

  • Sir..I have tried it with my actual hardware..it doesn’t show anything on the LCD only a series of small rectangles (like this ==============) on top of the LCD..i am very sure i followed everything in your program and schematic..help me pls.thanks!

  • Sir

    I have tried to make alarm in this project by modifying your code. Like I have used a int variable and converted your hour variable data to Decimal by using BCDTODEC16 in Mikroc as shown below:

    void Check_time(){

    hour=read_ds1307(2);

    Dhour=Bcd2Dec16(hour);

    }

    The Dhour is variable and I have used it in Main :

    Check_time();

    if(Dhour==12) // checking if its 12 o clock

    {

    Light=1; then switch on light

    }

    But practically its not working! will you please help me sir?

  • Proteus simulation will show the time in your PC.
    When comes to actual hardware, when you switch on the power supply it will show time 00-00-80… then you need to set the time..

  • Sir..i have tried your program in my project.,but i am using a pic18f4550 so i modified a little with the ports in the code..i was able to get the time running in my lcd but the problem is it seems that the rtc was synchronized with the clock in my pc.,i use my pickit2 in supplying voltage,but when i use a separate power supply, time in rtc does not display on lcd..what seems to be the problem?

  • good afternoon sir..
    can i know what version of proteus that you use?
    because the proteus file cannot be open at my laptop..
    tq sir.

  • good morning sir
    i was fortunate by downloading this project and im very happy for that but i got a little problem thats when the lcd dispalying time i see that theres a difference between the real time and your time on lcd in second digit its not running at the same time with the real second clock please can you help me to figure out this problem and realize my personal seven segment clock??

  • Pull up and pull down are common resistors ………..A resistor is called pull up when it is used to make HIGH a node……… while a resistor is called pull down when it is used to make a node LOW

  • I will try that… hope you can follow up my question because I don’t know about PIC… there is the hardware for pullup and pulldown resistor or just use the common resistor??

  • to make a pin high for 3 seconds at a particular time :

    if(hour == 5 && min == 40 && sec == 00)

    {
    PORTD.F0 = 1;
    Delay_ms(3000);
    PORTD.F0 = 0;
    }

    This code makes 19th pin of microcontroller high at 5:40

  • PORTD.F0 = 1 makes its output 5v while
    PORTD.F0 = 0 makes it output 0V

    there is the program that you mentioned or such to understand me about connection. PORTD.F0 = 0 makes it output 0V… I don’t understand this…

  • Pull up and Pull Down are two resistors………….. As its name indicates pull up is used to make a pin (or node) high while Pull Down is used to make a pin (or node) low……..But in the circuit I used 10K ohm resistors instead of Pull up and pull down…..

  • You can connect a buzzer to any of the output pin of the PIC…………and program it………For eg: if you connect buzzer to 1st pin of PORTD (19th pin)
    PORTD.F0 = 1 makes its output 5v while
    PORTD.F0 = 0 makes it output 0V

  • can I put the alarm for this circuit but I don’t know how to program.. can you help me on this…

  • sir, can you tell me what is the specific component of i2c in proteus…where i can get that hardware… help me sir… thanks

  • i have read sir ..i am getting where is prob….8051 kit is working properly but only DS1307 kit is not working properly as i think …….please suggest me what can i do.

  • HELLO SIR…..i have done my proteus simulation and and it works properly but in hardware lcd doesnot show any thing ….is there any precaution or special arrangement to connect DS1307 IC to 8051 kit…..

    thank you.

  • It may be the problem of power supply………PICKIT3 supply’s the 5v supply needed for the pic……..when it is disconnected the sudden change in the supply voltage affects it working………Use a 100uF capacitor across the VCC and VSS…….I think it will solve it.

  • I just figured out what the problem was, I was using a PAD trainer for my 5 volt power supply. When I switched to another variable power supply I have, the clock now works as it should with or without the PICKIT connected. FINALLY!

  • I successfully loaded this program on a PIC16F877a chip and it does work so long as the PICKIT 3 that is used to program the chip remains connected. As soon as I disconnect the PICKIT, the time on the LCD stays fixed. If if flip the power off and back on (on the PIC16) then it will refresh the time back up to date. My question is why doesn’t the PIC16 seem to run when the PICKIT is no longer connected. I’ve tried playing around with the registers and so far have no luck 🙁 Any ideas? Mycircuit is the same as the one in the article.

  • it is OK now, but i want to enhance on my project “Smart incubator
    Machine with Temp, Humidity, Fresh Airing, Motor for flipping, serial
    Interfacing and RTC for calculating Hatching Time Interval”.

    But the mikroc pro V4.6 with me is Limited in Code editing, is there any idea instead of buying Mikroc Pro, could you help me.

    Thanks for replying

    Ahmed Ramadan

  • I am using MikroC Pro v4.60 …………..Open the dc.c file in text editor and copy paste, then compile……….

  • Good job

    as for Proteus File, which version you used?, because MikroC Pro v4.6 can not open this file. waiting you ASAP.

    Thanks
    Ahmed Ramadan


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