Hi Is there a price shown somewhere on that sheet?
Bob On May 27, 2013, at 2:23 PM, Chris Albertson <[email protected]> wrote: > One more idea: Buy one of those "Atomic Clocks" that run off WWVB. Then > use time code to modulate a very low power 60KHz radio transmitter. The > clocks will pick up your signal and sync to it. The clocks run on > battery power and you don't need wires. > > But then I did notice you can buy exactly what you asked for $99. > /DS%5FTimeDisplays.pdf<http://www.symmetricom.com/media/files/downloads/product-datasheets/DS%5FTimeDisplays.pdf> > > > > > On Mon, May 27, 2013 at 9:40 AM, Bob Camp <[email protected]> wrote: > >> Hi >> >> If you are doing this from scratch today, would you go IRIG or would you >> go RS-485 for a wall clock? Both will drive more cable than you are likely >> to have in a house. Both are reasonably noise immune. With RS-485 there's >> less to do. It's a serial stream like any other bunch of "stuff" into a >> UART. >> >> Some math: >> >> YYMMDDHHMMSSCR = 13 ASCII characters. With one check byte it would be 14. >> A baud rate of 115.4K isn't stretching things on RS-485 or on most UART's >> these days. >> Sent it at 7N1 you have 9 bits per character, 126 bits in the message. >> Message takes a bit over 1 ms. >> >> Time it to anywhere in the string and the clock should be within <+/- 2 >> ms. That's better than I can see on a clock. Better yet, time it to the >> first (or last) character in the string. More or less a 10X improvement. >> You could also drop the year / month / day if the clock isn't going to use >> them. >> >> Take any of the Arduino (or what ever) LED display boards and drive them >> with something cheap. I doubt the "clock" end plus the drivers would be >> over $30. I suspect IRIG would cost a bit more once you got it all worked >> out. >> >> Bob >> >> On May 27, 2013, at 11:03 AM, Chris Albertson <[email protected]> >> wrote: >> >>> I've seen LLCD computer monitors used as clocks. Seems this would be >>> the perfect use for a Rasbury Pi. and a cheap monitor. $100 or maybe a >>> low-end Android tablet. >>> >>> The way it is more commonly done is you have you computer that is >>> using NTP produce an IRIG time code. Then there are any number of >>> commercial clocks and large digital LED displays that will use IRIG. >>> IRIG displays are not cheap but they sure are easy to find. >>> >>> On Mon, May 27, 2013 at 6:29 AM, Miguel Barbosa Gonçalves <[email protected]> >> wrote: >>>> Hi! >>>> >>>> I was wondering if anyone knows about a not so expensive wall digital >> clock >>>> that gets its time from an NTP server... >>>> >>>> TIA, >>>> Miguel >>>> _______________________________________________ >>>> 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. >>> >>> >>> >>> -- >>> >>> Chris Albertson >>> Redondo Beach, California >>> _______________________________________________ >>> 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. >> > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > 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.
