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How to build a Countdown clock with days, hours, minutes, and seconds? Answered

Hi guys,
New to the forum here. I just got finished building the LED light bar from this instructable: https://www.instructables.com/id/SLULFKFFGRLD2TE/. It's very cool and easy to put together. I'm definitely going to build a couple more.

I found that one on accident while I was here looking for another kind of project, and I'm hoping somebody with enough smarts can put a tutorial together for me and anybody else.

I'm looking for a countdown clock that is programmable. It should be able to count down to a specific time, and include days, hours, minutes, and seconds in this format - ddd:hh:mm:ss. I found an example on google images: http://sportsaffiliates.learfieldsports.com/files/2009/07/countdown-to-kickoff-clock.jpg.

I don't need it to be huge or anything. I've been looking for a how-to on building something like this for a while now. Any help would be greatly appreciated.


3 Replies

steveastrouk (author)2009-08-07

I built a couple for customers around 1999 funnily enough. I'll take some pictures of mine and put them here, or in an instructable.

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jcarver27 (author)steveastrouk2009-08-07

That would be awesome. Thanks for anything you can add :)

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steveastrouk (author)jcarver272009-08-07

Try this.

Sorry, it IS 10 years since I did it !


I'll dig out the program code if you like.


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