Hi everyone! I'm trying to develop a project that should be doable for a hobbyst like me, playing with a UNO board. The goal is to have a clock and countdown timer, for hours/minutes/second, to be used at sporting events at our local club, that can be controled with a cheap universal remote.
For the clock part, I've been successfully experimenting with the DS1307, and found enough code to manage it. Having a countdown timer seems no great deal starting with this. For the BIG display I was looking at this Sparkfun tutorial: http://www.sparkfun.com/tutorials/47 Seems that by using the shift-out registers (74HC595) and the Darlington Arrays (ULN2003), enough power can be controled. I'm plannig to use somo led sticks/bars, that have 5 piranha leds, and use 12V 50mA. So that's enough for the display electronics.
For the remote, I've seen many libraries that already solve the problem. I don't know if the interrupt calls and timers they use would affect the precission of the Clock/Timer. I guess it shouldn't, but I'm no expert.
What else should I take into consideration?