Hi all,
I have just tested NTP time sync from Garmin GPS18 USB on ALIX running
voyage, see my blog article:
http://www.punknix.com/?q=node/116
It ran smoothly except that the satellite signals are not strong enough
when running indoor.
Cheers,
Punky
Michael Grollman wrote:
> Rob,
>
> I have used the current stable version of Voyage with gps and ntp to get
> current time sync many times. The gps/ntp solution that works for me, and
> is documented on their site, uses gpsd 2.32+ (http://gpsd.berlios.de/) and
> SiRf3 GPS, which can be had USB or serial, although gpsd supports lots of
> GPS hardware. gpsd is very helpful for parsing position data into useful
> forms as well as dealing with the ntp stuff. The ntp.conf tweaks are
> documented at http://gpsd.berlios.de/gpsd.html and look something like this:
>
>
> server 127.127.28.0 minpoll 4 maxpoll 4
> fudge 127.127.28.0 time1 0.420 refid GPS
>
> server 127.127.28.1 minpoll 4 maxpoll 4 prefer
> fudge 127.127.28.1 refid GPS1
>
> This will not necessarily give you stratum 1 time server, although you can
> get close in you mess with the pps stuff, but it will be within a second or
> less at all times.
>
> If you are looking for a good waterproof GPS for outdoor use, based on
> SiRf3, these guys make a good one we have used lots of times before in
> embedded systems with Voyage and gpsd:
> http://www.usglobalsat.com/item.asp?itemid=60
>
> Cheers,
>
> - Michael
>
> -----Original Message-----
> From: voyage-linux-bounces+mgrollman=cox.net at list.voyage.hk
> [mailto:voyage-linux-bounces+mgrollman=cox.net at list.voyage.hk] On Behalf Of
> Kim-man 'Punky' TSE
> Sent: Wednesday, May 09, 2007 3:43 AM
> To: Robert Rawlins - Think Blue
> Cc: voyage-linux at voyage.hk
> Subject: Re: [Voyage-linux] Time/Date Issues
>
> Hi Robert,
>
> I used ntp time sync in my server (this server that powers this mailing
> list) that points to a GPS ntp time sync source (stratum 1). So I know
> that GPS can be used for the time sync.
>
> I think a small GPS device with serial (rs232) or USB line should do the
> job. But you will need some hacking:
>
> Just got this one from google, very interesting: http://time.qnan.org/
>
> I never had GPS experience, but I know someone (and met him last week)
> in the list that is very experience in electronic/radio communications.
>
> Punky
>
> Robert Rawlins - Think Blue wrote:
>
>> Thanks Punky,
>>
>> The problem is that we're likely to have some units that never connect to
>>
> the net, they'll spend most of their lives offline, so I need it to keep the
> date or time. I've just spoken to my WRAP supplier and he seems to think
> that there IS some kind internal clock on the wrap boards but he didn’t
> really know much about it.
>
>> If there is another solution out there, like some form of GPS mini-pci
>>
> card then I could probably work with that, I don’t mind the added expense,
> I'm just keen to get a working solution.
>
>> Thanks again for your suggestions guys, have you worked with the GPS stuff
>>
> before at all Punky?
>
>> Thanks chaps,
>>
>> Rob
>>
>> -----Original Message-----
>> From: Kim-man 'Punky' TSE [mailto:punkytse at punknix.com]
>> Sent: 09 May 2007 11:20
>> To: Robert Rawlins - Think Blue
>> Cc: 'Mike O'Connor'; voyage-linux at voyage.hk
>> Subject: Re: [Voyage-linux] Time/Date Issues
>>
>> Hi Robert,
>>
>> Set up ntpdate in cron job and run it every 10 min. Eventually, if
>> internet connection comes up, it should be able to sync. With wrap
>> board, it is hardly to sync the clock without the net.
>>
>> May be another way is to use GPS time sync?
>>
>> Punky
>>
>> Robert Rawlins - Think Blue wrote:
>>
>>
>>> Bugger :-D
>>>
>>> I'm using a WRAP2.E so I'm guessing that's not going to happen. What a
>>>
> nightmare this is going to turn into hehe.
>
>>> Thanks Mike,
>>>
>>> Rob
>>>
>>> -----Original Message-----
>>> From: Mike O'Connor [mailto:mike at pineview.net]
>>> Sent: 09 May 2007 10:55
>>> To: Robert Rawlins - Think Blue
>>> Cc: voyage-linux at voyage.hk
>>> Subject: Re: [Voyage-linux] Time/Date Issues
>>>
>>> Hi Robert
>>>
>>> You will need to get a board which has a battery for the clock.
>>>
>>> Mike
>>>
>>> Robert Rawlins - Think Blue wrote:
>>>
>>>
>>>
>>>> Hello Guys,
>>>>
>>>>
>>>>
>>>> I’ve used ‘date –s’ command to set a date and time on my voyage
>>>> system, but when the box boots up without an internet connection it
>>>> goes back to 31/12/1999. This is an embedded system that will quite
>>>> often boot without a net connection, so i really need to get this
>>>> sorted, does anyone know the best way to set the date/time and have it
>>>> keep it regardless of being connected to the net or not?
>>>>
>>>>
>>>>
>>>> Thanks,
>>>>
>>>>
>>>>
>>>> Rob
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> _______________________________________________
>>>> Voyage-linux mailing list
>>>> Voyage-linux at list.voyage.hk
>>>> http://list.voyage.hk/mailman/listinfo/voyage-linux
>>>>
>>>>
>>>>
>>>>
>>> _______________________________________________
>>> Voyage-linux mailing list
>>> Voyage-linux at list.voyage.hk
>>> http://list.voyage.hk/mailman/listinfo/voyage-linux
>>>
>>>
>>>
>>
>>
>
>
>
--
Regards,
Punky
P U N K N ! X . c o m
Technology + Lifestyle
(http://www.punknix.com)
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