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