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Countdown Timer

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ctduong1

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I am trying to create a countdown timer for a friend of mine who is expecting a baby. The counter I have seen are very small. I'd like to create a counter with a big led that will display month, day, minute, sec countdown where I can set the time and reset it after it is done. Does anyone have a schematic for this? Your help will be greatly appreciated.
 
Sounds like a job for a computer because the months have different days. You could pick up a used computer and display real cheap and program it. The computer has a built-in clock, so it is only necessary to display it.
 
After doing some research, it is going to be tough to do it in months so I would like to do it with day, hour, minute.
 
I wrote this program, in GWBASIC, just to show what can be done. It displays the date and time until the ending time. With a little more thought, I could subtract the dates to display the time remaining.
 

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ctduong1 said:
After doing some research, it is going to be tough to do it in months so I would like to do it with day, hour, minute.

Months is no harder than the rest, as long as you do it with a micro-controller - just using hardware the entire project is quite expensive and complicated.
 
ICM 7217B/C...

All that u need can be done using this UP/DN counter IC.
U will have to do some interconnection and some preloading of the counter and the register.

U will have to use multiple of these ICs and use drivers for the big size displays.

Gajanan Phadte
 
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