I solved this by having an rtc on my clock (for setting the initial time on reset) which I update it's time every 5 minutes with what is on my clock. That way, it only drifts when I loose power.
I can almost have my cake and eat it too! -joe On Wednesday 03 November 2010 11:38:56 [email protected] wrote: > Agreed. Unless your power goes out (often in my area). > > Michail > > > > In a message dated 11/3/2010 8:35:00 A.M. Pacific Daylight Time, > [email protected] writes: > > 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. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
