PIC16F84A Digital Clock

Introduction

This is a digital clock project built using PIC16F84A Microcontroller and 4017 Digital IC. This project uses 6 seven segments displays to show Hours, Minutes and Seconds. There are two push buttons provided to adjust the time.

Please note that I used MPLAB Versio 8.3 to build the code. (Not the latest version). If you have any error while compiling the code, please use an old version of MPLAB or use the compiled HEX file to program. You can download MPLAB V8.3 from above link

PIC16F84A Digital Clock YouTube Video

Completed circuit of the PIC16F84A Digital Clock

PIC16F84A Digital Clock When Running

PIC16F84A Digital Clock Schematic

If your clock does not count the time accurately, if you see a delay in counting the minute or if your clock counting the time fast, try changing the value on below line.

MOVLW .164 ; DECIMAL POINT DELAY SETTING

Try changing the value .164 and compile your code again.

Downloads for this Projects

Download Source Code
Download Compiled Hex (Ready to program)
Download Schematic
All in one zip
Download MPLAB v8.3

Comments Area

Add your questions and comments here. Comments will be published after the admin approval

Published By : Dissanayaka D.M.Y.B. Added Date :8/16/2021 11:44:51 AM proteus says 'simulation is not running due to high CPU load' How to overcome this matter? Admin Reply : Hi, I am not very sure about this. I haven't try this with Proteus. Make sure you use a latest version of Proteus.
Published By : Dobri Dobrev Added Date :6/25/2021 6:49:38 PM Hello, I did not expect much that you will answer me .... Good luck. Admin Reply : Admin reply is pending
Published By : Dobri Dobrev Added Date :6/22/2021 2:11:10 PM Hi! Would you send me the code for a 24 hour watch. Admin Reply : Admin reply is pending
Published By : Martha Added Date :4/21/2021 10:26:09 PM hey, is it ok if I use 32kHz crystal? Admin Reply : Hi Martha, Nope. You need to use 4MHz Crystal here.
Published By : Jairo Rocha Added Date :4/17/2021 12:42:15 AM Very good project Admin Reply : Thank you Jairo!
Published By : hariz Added Date :6/14/2020 1:02:11 PM i cannot find c828 in proteus and i cannot find also the library in google..can you help me please? Admin Reply : You can use a similar transistor instead of C828. It just work as a switch. Not sure about the library.
Published By : Fakhar naqvi Added Date :5/7/2020 9:07:23 PM I m bigner, so pray for my sucses Admin Reply : I will you all the best!
Published By : Efkar27 Added Date :11/10/2019 7:32:55 PM hi, dallas 18b20 temperature sensor connection is done, how should the hex file Admin Reply : Hi Efkar27, If you are trying to show the temperature also, This code need to be modified. Sorry I don't have a hex file to show the temperature. Need to modify the existing project.
Published By : John Added Date :8/29/2019 11:15:43 AM Sir do you have a program of digital clock using PIC16F84A and using the IC DS1307? Admin Reply : Hi John, I don't have complete project with PIC and DS1307, I found this one while searching [https://simple-circuit.com/pic16f84a-ds1307-rtc-circuit-ccs-c/] you may try. You can also try my Arduino project [http://www.manelsoft.com/projects/arduino_ds1307_clock.aspx]
Published By : Akmalzia Added Date :5/21/2019 4:14:23 AM Sir where is circuit diagram...please send me circuit diagram Admin Reply : Hi Akmalzia, Please download the ZIP files (You can see at the end of the tutorial) ZIP Files contains everything you need.
Published By : nandhini Added Date :2/3/2019 8:37:54 AM can we use pic16f877a instead of pic16f84a ? Admin Reply : Admin reply is pending
Published By : Piyush Tiwari Added Date :12/21/2018 8:50:27 PM could u provide the proteus .dsn file for better understanding??? Admin Reply : Hi Piyush , Sorry I don't have a proteus simulation for this project :(
Published By : Muhammad Added Date :8/8/2018 12:42:43 PM Kindly please send me the c code !? Admin Reply : You can find everything from the download link.
Published By : bouzekri Added Date :6/8/2018 5:22:22 PM Hello Congratulations for this project, or can you download the source code and hex for the clock in 24h thank you Admin Reply : Admin reply is pending
Published By : S R VERMA Added Date :3/10/2018 11:01:37 PM Sir I loke your clock program. But sir please give me full hex program with Dp blinking hex programm using 16f84a+cd4017. Admin Reply : Admin reply is pending
Published By : misheal Added Date :2/10/2018 4:24:13 AM you have another clock display date and temp..thank you Admin Reply : Admin reply is pending
Published By : S R VERMA Added Date :1/24/2018 4:17:05 PM I asamblea 6 digit clock using 16f84a+cd4017 but decimal point (DP) are not flashing . Please give me dp flashing code Admin Reply : Hello VERMA, You can use the pin number 6 (RB0) for this. Just add a simple blink to the code.
Published By : nihal Added Date :4/19/2017 11:32:42 AM how to use this circuit for common anode 7 segment Admin Reply : Admin reply is pending
Published By : abdellbaki Added Date :12/7/2016 7:21:04 PM please give me the cod of this progect Admin Reply : Hello, you can find the source code download links at the beginning of the page.
Published By : Indran Added Date :11/29/2016 2:14:07 PM Hi sir, can you please say the logic behind to implement this program Admin Reply : Explaining the complete logic in the comment is difficult. I will add a description later for this project.
Published By : rana Added Date :11/23/2016 2:36:36 PM Not accurate ... gaining or loosing about 7 min/24 hrs Admin Reply : If your clock not counting the time accurately, if you see a delay in counting the minute or if your clock counting the time fast, try changing the value on below line. MOVLW .164 ; DECIMAL POINT DELAY SETTING Try changing the value .164 and compile your code again.
Published By : kostas Added Date :5/23/2016 1:02:14 PM Construct the circuit the clock is not precision goes four minutes ahead I put led high brightness who occupy little illuminated the parts that should not be lit Admin Reply : Admin reply is pending
Published By : kedar patil Added Date :1/28/2016 7:46:39 AM digital 7 segment 6 digit colcok big 4 fut led ciruit diagram and hex fil i need you project Admin Reply : Admin reply is pending
Published By : kedar patil Added Date :1/25/2016 8:04:20 AM plz sr programar kshaver kryche. Admin Reply : Hi kedar patil, Your comment is not clear. Can you please send it again clearly?
Published By : jar gyi Added Date :1/14/2016 3:15:50 AM I study digital clock Admin Reply : Hi jar gyi, Thanks for the reply. Keep up.
Published By : Rana Added Date :11/15/2015 2:18:41 PM Please tell me how the result of this clock is? I mean how accurate the time is? if not then what is the method for calibration of this gadget? i am planning to build one but first of all i want to make sure that the time accuracy... thanks Admin Reply : Hi Rana, I cannot say that this clock is very accurate because this clock does not use a clock IC. if you can use a clock IC like DS1307 with this, then you can get accurate results.
Published By : jhone Added Date :10/17/2015 7:19:09 AM This project is nice Admin Reply : Thank you jhone.
Published By : Ajay Added Date :10/15/2015 2:48:46 AM Fine circuit. Does this have a battery back up on mains failure? If not how can we connect? Thanks Admin Reply : For the moment, there is no battery backup. You need to add a battery to the microcontroller.
Published By : mohd Added Date :10/6/2015 5:09:38 AM Sir, Plz sent to digital clock c programing lanluage. becouse i m not no what is hex file and asm file mains I m learning to microcontroller I m not engin. Plz sir I request to u. Admin Reply : Hi mohd, for the moment the code is in Assembly format, I will try to update the C program later.
Published By : mho Added Date :10/6/2015 5:08:48 AM good project Admin Reply : Thank you!
Published By : moho Added Date :10/6/2015 5:07:36 AM good project Admin Reply : Thank you!
Published By : ajayi peace Added Date :8/31/2015 12:52:24 AM the mplab programmer sells for how much Admin Reply : Admin reply is pending
Published By : Mangesh Kamble Added Date :4/19/2015 6:11:47 AM Sir, Plz sent to digital clock c programing lanluage. becouse i m not no what is hex file and asm file mains I m learning to microcontroller I m not engin. Plz sir I request to u. Admin Reply : Hello Mangesh, For the moment I don't have the C version of this project. I will try to add it when I have time.
Published By : mahmoud Added Date :2/11/2015 10:08:33 AM you have anther clock display date and temp..thank you Admin Reply : Yes I have a project with time and temp. I will send it to you.
Published By : martin Added Date :2/9/2015 6:29:40 PM se puede programar en codigo fuente Admin Reply : Admin reply is pending
Published By : Jukka Added Date :1/28/2015 9:25:29 AM Fine project ! but how to modify code to get 24 hour clock.Have not many tools to compile to HEX -code so can i edit direct to .hex file whit hexdump editor if i get orders to edit ? Admin Reply : I have the 24 hour version code also for this project. I will add it.

Published By : Dissanayaka D.M.Y.B.
Added Date :8/16/2021 11:44:51 AM

proteus says 'simulation is not running due to high CPU load' How to overcome this matter?

Admin Reply : Hi, I am not very sure about this. I haven't try this with Proteus. Make sure you use a latest version of Proteus.

Published By : Dobri Dobrev
Added Date :6/25/2021 6:49:38 PM

Hello, I did not expect much that you will answer me .... Good luck.

Admin Reply : Admin reply is pending

Published By : Dobri Dobrev
Added Date :6/22/2021 2:11:10 PM

Hi! Would you send me the code for a 24 hour watch.

Admin Reply : Admin reply is pending

Published By : Martha
Added Date :4/21/2021 10:26:09 PM

hey, is it ok if I use 32kHz crystal?

Admin Reply : Hi Martha, Nope. You need to use 4MHz Crystal here.

Published By : Jairo Rocha
Added Date :4/17/2021 12:42:15 AM

Very good project

Admin Reply : Thank you Jairo!

Published By : hariz
Added Date :6/14/2020 1:02:11 PM

i cannot find c828 in proteus and i cannot find also the library in google..can you help me please?

Admin Reply : You can use a similar transistor instead of C828. It just work as a switch. Not sure about the library.

Published By : Fakhar naqvi
Added Date :5/7/2020 9:07:23 PM

I m bigner, so pray for my sucses

Admin Reply : I will you all the best!

Published By : Efkar27
Added Date :11/10/2019 7:32:55 PM

hi, dallas 18b20 temperature sensor connection is done, how should the hex file

Admin Reply : Hi Efkar27, If you are trying to show the temperature also, This code need to be modified. Sorry I don't have a hex file to show the temperature. Need to modify the existing project.

Published By : John
Added Date :8/29/2019 11:15:43 AM

Sir do you have a program of digital clock using PIC16F84A and using the IC DS1307?

Admin Reply : Hi John, I don't have complete project with PIC and DS1307, I found this one while searching [https://simple-circuit.com/pic16f84a-ds1307-rtc-circuit-ccs-c/] you may try. You can also try my Arduino project [http://www.manelsoft.com/projects/arduino_ds1307_clock.aspx]

Published By : Akmalzia
Added Date :5/21/2019 4:14:23 AM

Sir where is circuit diagram...please send me circuit diagram

Admin Reply : Hi Akmalzia, Please download the ZIP files (You can see at the end of the tutorial) ZIP Files contains everything you need.

Published By : nandhini
Added Date :2/3/2019 8:37:54 AM

can we use pic16f877a instead of pic16f84a ?

Admin Reply : Admin reply is pending

Published By : Piyush Tiwari
Added Date :12/21/2018 8:50:27 PM

could u provide the proteus .dsn file for better understanding???

Admin Reply : Hi Piyush , Sorry I don't have a proteus simulation for this project :(

Published By : Muhammad
Added Date :8/8/2018 12:42:43 PM

Kindly please send me the c code !?

Admin Reply : You can find everything from the download link.

Published By : bouzekri
Added Date :6/8/2018 5:22:22 PM

Hello Congratulations for this project, or can you download the source code and hex for the clock in 24h thank you

Admin Reply : Admin reply is pending

Published By : S R VERMA
Added Date :3/10/2018 11:01:37 PM

Sir I loke your clock program. But sir please give me full hex program with Dp blinking hex programm using 16f84a+cd4017.

Admin Reply : Admin reply is pending

Published By : misheal
Added Date :2/10/2018 4:24:13 AM

you have another clock display date and temp..thank you

Admin Reply : Admin reply is pending

Published By : S R VERMA
Added Date :1/24/2018 4:17:05 PM

I asamblea 6 digit clock using 16f84a+cd4017 but decimal point (DP) are not flashing . Please give me dp flashing code

Admin Reply : Hello VERMA, You can use the pin number 6 (RB0) for this. Just add a simple blink to the code.

Published By : nihal
Added Date :4/19/2017 11:32:42 AM

how to use this circuit for common anode 7 segment

Admin Reply : Admin reply is pending

Published By : abdellbaki
Added Date :12/7/2016 7:21:04 PM

please give me the cod of this progect

Admin Reply : Hello, you can find the source code download links at the beginning of the page.

Published By : Indran
Added Date :11/29/2016 2:14:07 PM

Hi sir, can you please say the logic behind to implement this program

Admin Reply : Explaining the complete logic in the comment is difficult. I will add a description later for this project.

Published By : rana
Added Date :11/23/2016 2:36:36 PM

Not accurate ... gaining or loosing about 7 min/24 hrs

Admin Reply : If your clock not counting the time accurately, if you see a delay in counting the minute or if your clock counting the time fast, try changing the value on below line. MOVLW .164 ; DECIMAL POINT DELAY SETTING Try changing the value .164 and compile your code again.

Published By : kostas
Added Date :5/23/2016 1:02:14 PM

Construct the circuit the clock is not precision goes four minutes ahead I put led high brightness who occupy little illuminated the parts that should not be lit

Admin Reply : Admin reply is pending

Published By : kedar patil
Added Date :1/28/2016 7:46:39 AM

digital 7 segment 6 digit colcok big 4 fut led ciruit diagram and hex fil i need you project

Admin Reply : Admin reply is pending

Published By : kedar patil
Added Date :1/25/2016 8:04:20 AM

plz sr programar kshaver kryche.

Admin Reply : Hi kedar patil, Your comment is not clear. Can you please send it again clearly?

Published By : jar gyi
Added Date :1/14/2016 3:15:50 AM

I study digital clock

Admin Reply : Hi jar gyi, Thanks for the reply. Keep up.

Published By : Rana
Added Date :11/15/2015 2:18:41 PM

Please tell me how the result of this clock is? I mean how accurate the time is? if not then what is the method for calibration of this gadget? i am planning to build one but first of all i want to make sure that the time accuracy... thanks

Admin Reply : Hi Rana, I cannot say that this clock is very accurate because this clock does not use a clock IC. if you can use a clock IC like DS1307 with this, then you can get accurate results.

Published By : jhone
Added Date :10/17/2015 7:19:09 AM

This project is nice

Admin Reply : Thank you jhone.

Published By : Ajay
Added Date :10/15/2015 2:48:46 AM

Fine circuit. Does this have a battery back up on mains failure? If not how can we connect? Thanks

Admin Reply : For the moment, there is no battery backup. You need to add a battery to the microcontroller.

Published By : mohd
Added Date :10/6/2015 5:09:38 AM

Sir, Plz sent to digital clock c programing lanluage. becouse i m not no what is hex file and asm file mains I m learning to microcontroller I m not engin. Plz sir I request to u.

Admin Reply : Hi mohd, for the moment the code is in Assembly format, I will try to update the C program later.

Published By : mho
Added Date :10/6/2015 5:08:48 AM

good project

Admin Reply : Thank you!

Published By : moho
Added Date :10/6/2015 5:07:36 AM

good project

Admin Reply : Thank you!

Published By : ajayi peace
Added Date :8/31/2015 12:52:24 AM

the mplab programmer sells for how much

Admin Reply : Admin reply is pending

Published By : Mangesh Kamble
Added Date :4/19/2015 6:11:47 AM

Sir, Plz sent to digital clock c programing lanluage. becouse i m not no what is hex file and asm file mains I m learning to microcontroller I m not engin. Plz sir I request to u.

Admin Reply : Hello Mangesh, For the moment I don't have the C version of this project. I will try to add it when I have time.

Published By : mahmoud
Added Date :2/11/2015 10:08:33 AM

you have anther clock display date and temp..thank you

Admin Reply : Yes I have a project with time and temp. I will send it to you.

Published By : martin
Added Date :2/9/2015 6:29:40 PM

se puede programar en codigo fuente

Admin Reply : Admin reply is pending

Published By : Jukka
Added Date :1/28/2015 9:25:29 AM

Fine project ! but how to modify code to get 24 hour clock.Have not many tools to compile to HEX -code so can i edit direct to .hex file whit hexdump editor if i get orders to edit ?

Admin Reply : I have the 24 hour version code also for this project. I will add it.

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