I don't see why school crossing signs, water sprinklers, street or outdoor lighting need 1 second timing. Ten minutes, or a photocell, would be more than adequate.
Synchronized traffic lights, perhaps. But there are other cheaper, ways of doing that like a simple radio link. -John =============== > > [email protected] said: >> There are innumerable applications for low cost low power human level 1 >> second accurate time of day in modern electronic systems - examples are >> traffic lights and school crossing signs and water sprinklers and street >> lights and other outdoor lighting and many others... these systems are >> not >> normally network connected and there is no current wide area technology >> short of power hungry GPS with its weak signals and relatively high cost >> and >> difficult reception from many locations to do this. > > How many of those are really interested in low power? > > The only one I see on your list that might run off batteries is water > sprinklers. All the rest use enough power that a GPS unit would be in the > noise. > > I think the main argument for WWVB receivers vs GPS receivers would be > cost. > In either case, you have to get the antenna outside the metal enclosure > and > that may be the major cost. (I suppose a sprinkler controller could be > mounted in a plastic enclosure.) > > "school crossing signs" is another possibility. In the last year or two, > I've seen several setups around here that have solar powered LEDs mounted > at > street level at pedestrian crossings. They are great at night but not so > great during the day. (But during the day the pedestrians are easier to > see.) > > > > -- > These are my opinions. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
