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Perpetual Countdown Clock Project
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[QUOTE="DaveC426913, post: 6849887, member: 15808"] [B]TL;DR Summary:[/B] I want to make a countdown clock that doesn't need maintenance to reset it every year. I want to (try to) build a "Countdown to Launch Day" clock for my sailing club. Ideally, it should require no maintenance (meaning, once I'm gone, it will keep working). Even as my right brain was thinking how cool it will be, my left brain started counting the ways it would be problematic: [LIST] [*]Launch Day is always the [B]last Friday of April[/B], so not always the same every year (but abides by the 28 year perpetual calendar). [*]If it were a [B]web page[/B], it would be trivial, but I want a gadget - that sits on a shelf. [*]It would be super cool if it were [B]electro-mechanical[/B] in nature (like an electric clock is) - as distinct from electronic, such as an Arduino*. [*]With the exception of a backup battery, I don't know how it would survive the occasional [B]unplugging[/B] and loss of time sync. [*]With the exception of a Wifi connection, I don't know how it could [B]recalibrate[/B] itself if/when it does get unplugged. [/LIST] Casting about for inspiration. *if it [I]were[/I] Arduino-powered - which I suspect might be the only viable option - does that have everything I need? Notably, a small display screen and a web connection so it can keep its clock in sync after power-reset? [/QUOTE]
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