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:

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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:
7 segmants.JPG
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
part side.JPG
7 segment.JPG
board back side.JPG
segmant . driver.JPG
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
box 1.JPG
clock inside.JPG
2  buttons.JPG
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.
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prash_thil4 years ago
gotta try this at home!!!!!!
i have never tried programmin a pic before
Gotta Try this
slwthr (author)  prash_thil4 years ago
good idea.try try!!I have uploaded all the details with hex file for PIC16F84A.Hope you can work this out well.Good luck!
billy29 slwthr2 months ago

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

TrishiaI6 months ago

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

0987653 years ago
Can you send the list of the entire parts and entire circuit diagram of big seven segment clock to email below.
slwthr (author)  0987653 years ago
please download the full project Clock.rar file in this page..Thanx!

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)  DawnComeaux1 year ago

Ok now everyone who need this kit buy over here:


ozbone21 year ago

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

natasha1462 years ago
is there any reason why you use a950 and c1815 transistor?can i replace it?
slwthr (author)  natasha1461 year ago
No special reason for C1815 but I used A950 because its a darlington transistor which came in small package.. You can replace it
moustick1 year ago
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)  moustick1 year ago
Your welcome you moustick
aressar1 year ago
hello , bro can u plz send me the ciruict diagram along with the pic program for big 7 segment clock on my email id....
oman11 year ago
Helo sir, can u please send me the MicroC files for Big 7 segment clock.

sislam72 years ago
Hi, please send the details for Big 7 segment clock.
(with hex file)
rafanun3 years ago

can you send me full details of this clock?
slwthr (author)  rafanun3 years ago
please download the full project Clock.rar file in this page..Thanx!
slwthr (author)  rafanun3 years ago
Sent a new design with hex code
Can you please send me the full details of this project with a proper circuit diagram ?
Have you .hex File for PIC16F628
slwthr (author)  asankasrimal3 years ago
Sorry!I heven't
ramesh773 years ago
Hi im interested on this very much.....can you please send me the circuit diagram and the .hex file if using PIC16F628A??
slwthr (author)  ramesh773 years ago
I don't have one for one with 16f876
dansan1013 years ago
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)  dansan1013 years ago
Here is the link for Large 7 Segment Display..Bit expensive than in Sri Lanka market.

And sent the mail with new design!
gonzaled133 years ago
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)  gonzaled133 years ago
Sent a new design with hex code
bita983 years ago
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)  bita983 years ago
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?
Shabbar3 years ago
sponcio3 years ago
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 ??
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
dhudzs3 years ago
can you send me full details of this clock,
hi send me full details of this clock,
slwthr (author)  saqlainmushtaq4 years ago
yixiong.864 years ago
Hi, Can also send me "" thanks
slwthr (author)  yixiong.864 years ago
Sent a new design with hex..
Robomind4 years ago
hi plz mail me the he code i hav to try its nice

mail id:

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