Smallest Binary Clock

This is the Smallest Binary Clock that show the time with just 4 leds.
The brain in this clock is PIC16F84A,The time will be displayed when the 'show' pushbutton is pressed. The digits of the time are displayed in BCD on the four LEDs. Tens of hours is displayed followed by hours, tens of minutes and then minutes.

Step 1 Parts

For this project you will need:

1.PIC16F84A
2.Crystal 32.768khz(you may find in ordinary clocks)
3.Four leds any color
4. Resistors 4x270 ohm
5. Ceramic cap 2x33 Pf
6. Push Buttons 3 peaces

Comments

[awesome746]

How do you set it?

[macobt]

First you press ''set'' button than with ''select'' button you set the numbers,remember that the clock is set in opposite way I mean first you set the last number,minutes than hours.
Regards

[Suraj Grewal]

I tryed this,pic written properly and confermed data,
but when connected to circuit given by you, ic gets hot and gets destroyed even at 3volts
but i liked your idea and will try to troubleshoot.
this thing made me crazy and even I dont know from where i got to arrange the 3 pics
ive got i just got them arranged some how.
I really want to make this thing

[macobt]

First you will need to use new pic,because if the pic get hot that mean that the pic is dead :( As you can see the circuit is very simple,check your programmer its ok.
Or send me some pictures to [e-mail]

[Suraj Grewal]

thanks

[mg9990]

could you maybe help me? im trying to make a clock very similar to this accept the led changes every hour and it shows 12 leds (one for each hour) Could i do this in a similar way to yours?

[16zzundel5]

Here are pictures of my board design and Eagle schematic. If anyone would like these files, please email me. I just placed an order with BatchPCB and Futurlec for the board and components, respectively. I am very excited for this project! If anyone would like me to program their PIC, I can do that.

[macobt]

great job,just keep going with good work.

[16zzundel5]

I can't get your hex code to download. It says it is an incorrect link.

[macobt]

Here is new link
https://rapidshare.com/files/4206999002/Clock_2.hex

[mwagner63]

What programmer should i use for this that is not a jdm programmer

[techno guy]

You should put this on top of a wrist band and you can make a wrist watch like that.

[chinx]

can you please give me the code for this project?pls....

[macobt]

The hex code for the clock is in step 2(programming and wireing)

[robot1398]

do i have to load the rar file

[yaly]

hi i have all the components but when i plug my micro controller to be programed it gives me an error. the pic16f84a i have is brand new and i tried several programing softwares and serial and usb programming boards i even tried different hex files please help.

[yaly]

hi i have all the components but when i plug my micro controller to be programed it gives me an error. the pic16f84a i have is brand new and i tried several programing softwares and serial and usb programming boards i even tried different hex files please help.

[botronics]

I got the hex code to load with the pickit 2. What ever the problem i had earlier was my ICD on my other programmer got confused. The compiled .ASM code matches the hex file. So nothing funny is "buried" in the code. I set up a protoboard to test the pic. It seems to run. One problem I see is this. You really can't tell which digit is being flashed out. 01:00 can look the same as 00:01. There is nothing to tell what digit position is indicated. We need an extra led to show the pacing of the leds.

[botronics]

When I load the hex code with pickit2, it says its not a valid hex code. If you click on the hex file, a box opens and asks how to set up a comport. What is going on with this file? A true hex file is just a list of hexadecimal characters, should not have code to cause a comment box to open. It might be better to run the .asm file thru mplab and do a quick build (which I'm going to do now) and make the .hex code. By the way, a 16f628 is not exactly like a 16F84A. The allocation of memory and ports may be different. Just depends on the application.

[KeganBlaydes]

i have a quick question to ask. after assembling the clock and (correctly) transferring the .hex file onto the pic 16f84a, the clock itself doesnt do a thing. when connected to the battery, it only sits there, like it probably should. but after you press any button, nothing happens. they only thing that i can make it do is to quickly flash all 4 LEDs when i connect it to 12V+. and even that only happens with 2 second delay. any clues what might be wrong here?

[macobt]

the clock is not working on 12 volts,its working on 5volts,if you connect the microcontroller on 12 volts its gona burn.

[KeganBlaydes]

i am aware of that. but as i said, anything below 12 volts doesnt give any response whatsoever. the 12 volts part was just an extreme test to see if anything works at all.

[robot1398]

while programming we have to enter the hex code in the software?

[sobadnomad]

Have you tried making it a watch?
What LEDs do I need?

[macobt]

 You can use ordinary leds,I use bright leds.

[c1c2c3]

But what village?

[dungeon runner]

Perhaps...you mean voltage?

[Aeroflame]

Hi, just wondering what battery you'd need to use to run this? Thanks

[macobt]

Hello
This clock works with PIC16F84 microcontroller,and voltage is 5 volts.

[Aeroflame]

Also, would this work with any 18 pin PIC chip?

[c1c2c3]

but how to connect to pc

[mitko900]

Hi all I make the sheme show me the time but hi is not match with the real how can I set up the clock in the real time in my country.
Thanks in advance for evry comment.

[macobt]

 hello
When is presed the ''select'' button you can set the time.First are the minutes that hours.

[mitko900]

can you make me some video example or something because in me just changing the leds one by one.

[brooklynlord]

i have 3 questions:

Are the button switches momentary or on/off?

How many picofarads should the load capacitance be for the crystal?

And do you must use 33 picofarads for the ceramic disk capacitors?

[brooklynlord]

Oh, and can there be a subsitute for the 16F84A that can be programmed with the same scripts and the JDM programmer? i find that the 16F84A in digikey is a little bit expensive.

[macobt]

 I dont think so,I know that the pic16f84 is expensive because is older version,I had the PIC in my junk and I use it for this clock.I have not buy a new one:)

[macobt]

 Hello
The switches are momentary
For crystal  you need two disk capacitors of 33,yes you must use these because if you use capacitors with smaller or biger capitance the clock will speed up or speed down with work.

[brooklynlord]

For the crystal, theres this thing called "load capacitance." I don't know how many picofarads this should be, because if you search in crystals in digikey, it ranges from 12.5 picofarads to 6 picofarads.

[brit]

I see the website is still up for this clock.
So the ASM and full instructions are  available.
http://www.piclist.com/techref/piclist/cheapic/binclock.htm