I need a 10 digits (rather large) second countdown clock
made with bright elements.
Needs to be battery-operated connected to a USB battery adapter for easy interchangeability
and a backup battery for a lifetime memory for the countdown.
Thank you very much for your prompt response.1- Yes, 10 digits. This is an art project, where my intention is to stress the importance of time. If human life is given 99 years to live, it will amount up to 3,122,064,000 seconds. Since this is the first of a series, this one will be needed to subtract my actual age, and then, synchronize for the "remaining" period of time.
2- Brightness- This will be barely visible behind the canvas. It will look stub;e. You need to approach the piece to appreciate it. What I mean by brightness, I'm referring to the digit itself. The larger the better.
3- Since the galley space does not have power inputs nearby, gallery p[ersonnel will change battery when needed.4- Yes, so the battery exchange do not "turn off" the countdown.
5. The Engineer/ professor here in Puerto Rico, can not help me this time due to his teaching agenda. He can help me develop the rest of the specs. He already spoke about specifics for the solution. Should you are interested (please, provide me your country, so I can calculate shipping timing and capabilities), please provide me with an estimated cost and time frame. Best regards.
That's a very long life! More typical would be ~80 years, or whatever the life expectancy is in your country.I assume you're looking for 7-segment style display here.Those digits can be made as big as you want. The larger the better... how about 10 meters tall? Can be done. You just need a crane for installation and a Tesla car battery or so to power the thing, but I have the feeling you'd have to walk quite far away from the installation to read the digits. A quick search turned up 22"/52 cm tall ready made displays, that's the kind used at e.g. gas stations to show the price. You're the artist, you tell how big and how bright you want it to be.Clear.I'm in Hong Kong - so quite far from Puerto Rico (to get materials to you) but close to China (to get the components inexpensively and quickly). Batteries you'll have to get yourself, can't ship them.Yes, I get them. No problem. micro USB or USB. Both.Programming: easy. Set the seconds based on your birthday; DS3231 RTC with battery backup; set time based on the sketch compile time. Gonna be a few seconds off but that's for sure far less than the error in your birth day/time.Hardware: Arduino Nano, RTC, and then... maybe needs an array of shift registers with a load of high powered MOSFETs to driver the digits, maybe as simple a TM1627... it depends on how big and bright the digits have to be.Cost: depends on the specification of the digits. It depends on you how big it has to be. The digits also determine the way they're driven, which in turn affects the control hardware and the programming.