dave-in-nj:
how accurate do you need to be ?
can you check your time once a day ?
Dave,
Reasonably accurate but not to the second or to even the minute. I am not doing anything scientific or like process measurement here, just opening and closing a door at some time shortly after sunset. At this point I cannot check the time unless I actually take my laptop out to the barn and hook up to a serial monitor. At some point Id love to get a modbus connection or some sort of data polling method so that I can write a simple SCADA monitoring method. but with my program running so long I am worried that I might be tapping the edges of the Mega's floating point math abilities.
What I might do, is tie in that LCD back pack, and just have it display the system time that way I can track accuracy