# Digital clock need!

H

#### [email protected]

Jan 1, 1970
0
Hello all. I am new to the world of digital electronics, I would like
to build a digital clock HH:MM:SS with 16F84PIC on 7 segment LED, I
need circuit diagram, software and processing explanation.

Thanks!

E

#### Elephant

Jan 1, 1970
0
Hello all. I am new to the world of digital electronics, I would like
to build a digital clock HH:MM:SS with 16F84PIC on 7 segment LED, I
need circuit diagram, software and processing explanation.

Thanks!

http://electronicsusa.com/productsclocks.html

http://home.howstuffworks.com/digital-clock.htm

Good luck. I built one with huge 7 inch LED displays.
After I plugged it in and the digits started counting,
I was so proud of myself. That clock is now my pride and joy.
I show it off every chance I get. Hope you'll be just as

A

#### Anthony Fremont

Jan 1, 1970
0
Hello all. I am new to the world of digital electronics, I would like
to build a digital clock HH:MM:SS with 16F84PIC on 7 segment LED, I
need circuit diagram, software and processing explanation.

There are a number of ways you can accomplish this task. You need to
tell us more about your requirements. For example, do you need battery
operation or would AC power be ok? How much accuracy do you need? Do
you need it to set itself?

BTW, the 16F84 is getting kinda old, the 16F628 or 16F88 might be of
interest to you as they are cheaper and have more features.

Here is a good place for some PIC info:
http://www.finitesite.com/d3jsys/
and another really good one:
http://www.piclist.com

J

#### James Douglas

Jan 1, 1970
0
Elephant said:

http://electronicsusa.com/productsclocks.html

http://home.howstuffworks.com/digital-clock.htm

Good luck. I built one with huge 7 inch LED displays.
After I plugged it in and the digits started counting,
I was so proud of myself. That clock is now my pride and joy.
I show it off every chance I get. Hope you'll be just as
OMG, check out those prices like $49.99 for a little clock kit! Alot of that stuff looks very high priced to me.............. B #### Bill Bowden Jan 1, 1970 0 Hello all. I am new to the world of digital electronics, I would like to build a digital clock HH:MM:SS with 16F84PIC on 7 segment LED, I need circuit diagram, software and processing explanation. The PIC16F84 has been replaced with the PIC16F628. There is a digital clock program and schematic using the PIC16F628 at: http://ourworld.compuserve.com/homepages/Bill_Bowden/pic_ck.htm -Bill H #### hiroc Jan 1, 1970 0 12V is battery, I need to set it and accuracy may be +(-) 1sec /10 days A #### Anthony Fremont Jan 1, 1970 0 hiroc said: 12V is battery, I need to set it and accuracy may be +(-) 1sec /10 days That is about 1ppm (part per million) accuracy. The only way that I know to achieve that sort of accuracy is to use either a GPS module or a reference to WWV. Most crystals will only give you a accuracy between 20-50ppm. S #### [email protected] Jan 1, 1970 0 Anthony said: days That is about 1ppm (part per million) accuracy. The only way that I know to achieve that sort of accuracy is to use either a GPS module or a reference to WWV. Most crystals will only give you a accuracy between 20-50ppm. LEDs and batteries are a poor mix. Even if running 1 mA/segment, it will drain the battery pretty fast -- and be pretty dim. LCD is better for batteries. If it MUST be LED, running off the power company would easily provide the accuracy by simply counting the cycles of the AC. Mine runs great and certainly meets the accuracy spec. GG D #### David L. Jones Jan 1, 1970 0 Anthony said: days That is about 1ppm (part per million) accuracy. The only way that I know to achieve that sort of accuracy is to use either a GPS module or a reference to WWV. Most crystals will only give you a accuracy between 20-50ppm. The DS4000 TCXO does 1ppm http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3476 Dave D #### David L. Jones Jan 1, 1970 0 Anthony said: Well looky there. Only$18 in thousand lots. ;-) Still cheaper and
more convenient (not counting that BGA packaging) than a GPS module,
pretty slick.

The DS32KHz is cheaper and almost as good and comes in SO package:
http://www.maxim-ic.com/quick_view2.cfm?qv_pk=2940
This is the one I meant in the first place, sorry, I thought they had
changed the part number or something.

Dave

Replies
9
Views
1K
E
Replies
11
Views
5K
Michael
M
E
Replies
11
Views
1K
Chris Carlen
C
Replies
7
Views
4K
Replies
11
Views
937