Introduction: Big 7-segment Digital Clock

Picture of Big 7-segment Digital Clock

Using only 2 capacitors, 3 resistors, 4 BIG seven-segment Display, 1 xtal, 2 switches ,and 1 Microcontroller PIC, you can build this Digital Led Clock main circuit.

you can use common anode or common cathode display, just select the display type. Here is the pinout information:(I have attach the all diagrams of parts and 7 segments)

I'm used 4x 6" big 7 segment display's.

​Ok now everyone who need this kit buy over here:


Step 1: Simple Paper Copy Schematic

Picture of Simple Paper Copy Schematic

here is the schematic and part list for the project.

IC - PIC16F628 / PIC16F84A

Step 2: Collect Your Parts:

Picture of Collect Your Parts:

4x  6" big 7 segment display
3x 10K Resistors
2x  tack switches (micro switches)
4MHz Cristal (XTAL)
2x  22PF

If you are planing to protect your IC you should connect the IC through 5V regulator (1x 7805)

Vero baord(I used dot matrix board)

and other 7 Segment driver circuit parts displayed with attach image.

Step 3: Solder Your All Parts

Picture of Solder Your All Parts

Solder your all parts on to your vero board matching with this Circuit diagram.

Please do not solder your PIC16F84 on your board.Fix that through 18 pin IC base or Zif socket. 

Step 4: Make Your Enclosure

Picture of Make Your Enclosure

Make a enclosure box  for clock.(makes with plastic acrylic sheet + glue) 

and completed circuit board and 7segment board fix on your back plastic acrylic sheet.

and fix the Hour and Mins adjusting button to your enclosure right side panel.

Step 5: Programe Your PIC16F84

Picture of Programe Your PIC16F84

I have attach the HEX (16F84 clock) file for this clock.You have to burn it into your chip well.


soumitraseth (author)2017-08-21


travi (author)2017-03-17

also what could be replacement transistors to c1815 and a950


travi (author)2017-03-17


please send all programs and part details for newer design along with schematic to my email


prash_thil (author)2010-12-13

gotta try this at home!!!!!!
i have never tried programmin a pic before
Gotta Try this

slwthr (author)prash_thil2010-12-13

good idea.try try!!I have uploaded all the details with hex file for PIC16F84A.Hope you can work this out well.Good luck!

AyanS13 (author)slwthr2017-03-15

Or can u give me programmed ic if yes then contact me at

AyanS13 (author)slwthr2017-03-15

Hi. I want to know how I connect 16f84 to my laptop?

billy29 (author)slwthr2015-05-15

hi slwthr, what are the things (software and hardware) I need to program my microcontroller and load the hex files?

praveenkumar2000 (author)2016-06-07

well can we make this using atmega 328 or arduino

if yes please send me the code and circuit to my mail id.

joshnair (author)2015-08-02

Sir.. I have one 7 Segment display which displays battery voltage.. I have c program file also. Can u modify that program to didplay it as battery percentage thats 0 To 100 Max..if u r ready to help me. I will send the full project to u.. Plz reply to my e-mail id..

TrishiaI (author)2015-01-24

can you send me the list of the entire circuit diagram including the power supply?? and do you have a hex for pic16f87??

098765 (author)2012-04-15

Can you send the list of the entire parts and entire circuit diagram of big seven segment clock to email below.

slwthr (author)0987652012-04-15

please download the full project Clock.rar file in this page..Thanx!

DawnComeaux (author)slwthr2014-03-22

hello slwthr, please help me get a pdf or details of how to build the 7 segment digital clock. this is ma email: ......thank you!!!!

slwthr (author)DawnComeaux2014-03-22

Ok now everyone who need this kit buy over here:

slwthr (author)2011-03-11

your welcome. I will send it soon.

DawnComeaux (author)slwthr2014-03-22

hi can u help get a detail of to build the 7 segment digital clock.......this is my mail acct;

DawnComeaux (author)2014-03-22


ozbone2 (author)2014-02-20

can anybody send me a pdf on dis 7 segment digital clock, please!!!

natasha146 (author)2013-05-11

is there any reason why you use a950 and c1815 transistor?can i replace it?

slwthr (author)natasha1462014-01-07

No special reason for C1815 but I used A950 because its a darlington transistor which came in small package.. You can replace it

moustick (author)2013-11-24

Thank you for your wiring, it help me in my design of my big clock also. I was stuck with the multiplexing the 12V led segments, great instructable

slwthr (author)moustick2014-01-07

Your welcome you moustick

aressar (author)2013-10-19

hello , bro can u plz send me the ciruict diagram along with the pic program for big 7 segment clock on my email id....

oman1 (author)2013-10-06

Helo sir, can u please send me the MicroC files for Big 7 segment clock.


sislam7 (author)2013-06-16

Hi, please send the details for Big 7 segment clock.
(with hex file)

rafanun (author)2011-11-29


can you send me full details of this clock?

slwthr (author)rafanun2012-04-15

please download the full project Clock.rar file in this page..Thanx!

slwthr (author)rafanun2012-02-05

Sent a new design with hex code

akarmakar (author)slwthr2012-04-06

Can you please send me the full details of this project with a proper circuit diagram ?

asankasrimal (author)2012-03-27

Have you .hex File for PIC16F628

slwthr (author)asankasrimal2012-04-05

Sorry!I heven't

ramesh77 (author)2012-04-01

Hi im interested on this very much.....can you please send me the circuit diagram and the .hex file if using PIC16F628A??

slwthr (author)ramesh772012-04-05

I don't have one for one with 16f876

dansan101 (author)2012-03-12

Hi, im looking at replication this and i was wondering if you could tell me where you got the 7 segment displays, and if you could send me any of the relative informtion on the circuit. Cheers dan

slwthr (author)dansan1012012-03-13

Here is the link for Large 7 Segment Display..Bit expensive than in Sri Lanka market.

And sent the mail with new design!

gonzaled13 (author)2012-02-03

Can you send the list of the entire parts and entire circuit diagram to email below.
I only have 4 pcs. of 3 inch displays, will the clock work if I use them instead of the bigger displays.


slwthr (author)gonzaled132012-02-05

Sent a new design with hex code

bita98 (author)2011-10-20

Hi, can u please send me the ciruict schematics and help me about how to connect the 7 segment displays to my microcontroller? I am using Bare_Bones Board as my microcontroller and was trying to use 74hc595 bcd, but my clock doesn't work.... Could u please help me

slwthr (author)bita982011-10-21

Dear friend,I haven't try any microcontroller circuit using "Bare-Bones Board"..I only used PIC microcontroller and assembly or C compile software's. But Bare-Bones Board has a Atmel chip and its own software nah.

Why your clock not working? what trouble you guess? what schematic you want?

Shabbar (author)2011-09-18


slwthr (author)2011-03-09

Cool :)

ecinev (author)slwthr2011-03-11

hey.. we're asked to built the same circuit in the josepino.. i tried your hex but it doesn't fit. .... Do you have the hex for it??? 2 capacitors, 7segment anodes, 10k resistor, pic16f84a, 2 switch... can you help me?? please...

slwthr (author)ecinev2011-03-11

which display size u used? Big 7 segments or small one? Microcontroller Circuit is just simple like this.(From Josepino) but If you are using Big 7 Segment you must have to build Transistor array(darlington) like this diagrams.then couple with microntroller out puts to Big 7 segment display's.

Does your 7 segments displays any thing??

cali909 (author)slwthr2011-09-03

Hey wass up brother, man! that is a great digital 7 segment clock. I am interested after taking my first intro. class of engineering and about to complete my programming class. Arduino can I have a copy of you schematic and programming layouts to apply practice in my field.

ecinev (author)slwthr2011-03-11

small one...but the display is incorrect..

slwthr (author)ecinev2011-03-11

please give me your email address,will massage you this clock modified version without transistors.(with darlington array IC control)

sponcio (author)2011-08-15

hi sir! can you pls help me to do a 7 segment clock (the small one like a match box) i just need the seconds .. what IC and schematic diagram will I going to use ??

vasanthsam22 (author)2011-08-08

hi bro i'm doing my 3rd yr ece but doesnt knw the basics but i like to do this clock so plz help me bro give me guidance and sent all the info of this clock to me

dhudzs (author)2011-08-06

can you send me full details of this clock,

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