The simplest and cheapest way to go is to use line frequency. Accurate within a couple of seconds over months and the cost of implimentation is:
1. AC 9V wall wart. 2. 6 diodes. 3. 7805 regulator to you +5V for your micro. connect the clock signal to your microcontroller and every time you see 60 pulses on your input pin (50 if you're not in North America), increment your seconds register. Done. On Wed, Nov 3, 2010 at 7:17 AM, <micha...@aol.com> wrote: > Frank/Steve, > > Another thought is adding a WWRB receiver. $13 from Digikey. This way you > are always accurate (or at least self fixing all the time - and no need to > worry about ever setting the time). > > I bought two of them, but, I have to admit. They aren't doing very good > since I still have them in their packaging. heh. > > Michail > > > In a message dated 11/3/2010 5:12:09 A.M. Pacific Daylight Time, > bemel...@franktechniek.nl writes: > > Doesn't that give you an inaccuracy of +/- 5ms on your 60 seconds > measurement? > > Frank. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to neonixi...@googlegroups.com. > To unsubscribe from this group, send email to > neonixie-l+unsubscr...@googlegroups.com<neonixie-l%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixi...@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
