[time-nuts] WWV / WWVH / WWVB
David M. Witten II
wittend at wwrinc.com
Wed Jan 7 09:52:23 EST 2009
James R. Gorr wrote:
> When I look at the catalogue, the description says:
>> | UTC Receiver Module, 60kHz, no CPU | 561-1014-ND | 10.70 | CMMR-6P-60 |
> I have looked at modules like this before but what I saw was much more expensive. So I'd like to get one at < $11.00. Have you been able to RX WWVB with it (even if you haven't written anything to decode it)?
No, I haven't had time to make one work. It seems like a nice little
package, but how useful and for what purposes I am not yet certain. My
curiosity just got the better of me (again). The device produces a
pulse train that encodes the WWV information.
> I wonder what the no CPU means?
That worried me too. I read the manufacturer's information and it seems
that this is sometimes used with an Epson 4 bit CPU. But any CPU/MCU
should be able to do the job. A small PIC or AVR should be able to
handle it easily. I did a little experimentation with a small ARM7
module (ARMite from Coridium), but haven't had time to do anything useful.
There is an article in the November '08 Circuit Cellar Magazine that
uses this module with a Freescale DEMO9S08QG8:
Time Server Design:
Synchronize with the WWVB Time Code Signal
Honorable Mention WIZnet iEthernet 2007 Design Contest
by Steven Nickels
The article can be purchased at:
The article gives some details of decoding, but I don't have Freescale
tools and have a satisfactory (better) NTP server, so I won't duplicate it.
I would like to know what others might do with this thing.
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