[time-nuts] A man with two clocks...

[Sarah White]

http://www.satsignal.eu/raspberry-pi/DigitalClock.html

third paragraph:

I've provided the source and binary files in >>>this<<< Zip archive, so
you can either run the program as-is, or modify it to suit your own
preferences.

On 10/3/2013 6:43 PM, Phil Genera wrote:
> Is your code posted anywhere? I've been meaning to do roughly the same.
> 
> -- Phil
> On Oct 3, 2013 12:07 PM, "Collins, Graham" <CollinG at navcanada.ca> wrote:
> 
>> David,
>>
>> Your raspberry-pi NTP clock is very cool.
>>
>> I have put together something along the same line but is in reality just a
>> network connected NTP disciplined clock display using an Arduino and a
>> typical 16x2 LCD housed in a small project box.
>>
>> The Arduino has a network shield and get's it power from a USB port
>> although it could be powered by a battery or wall wart type of supply.
>>
>> When it starts, the device attempts to get an IP address using DHCP. Once
>> that is sorted it attempts to sync to my local GPS disciplined NTP server,
>> then sets and displays it's time. It resyncs every some value between 15
>> and 30 minutes with the NTP server. If ever my local NTP server can't be
>> found, it will attempt to sync to an outside NTP server on the internet. It
>> keeps pretty good time, not "time nuts" level but is always within a few
>> tenths of a second which is suitable for it's intended purpose.
>>
>> Basic time keeping of the Arduino uses it's 16MHz crystal clock and there
>> is some provision for adjusting in code which I have done to improve it's
>> time keeping. I am toying with the idea of adding a 1 PPS input but just
>> haven't gotten round to it yet.
>>
>> All the bits and pieces of the code was copied from existing projects and
>> libraries it being just a matter of finding the appropriate bits and
>> pieces, putting them together and making changes in a few places to improve
>> it's time keeping. It was a fun project to put together and has proven so
>> useful in my lab that I will probably put together a couple more.
>>
>> Cheers, Graham ve3gtc
>>
>>
>> ===================================
>>
>> Max,
>>
>> I see similar things here.  I've always put it down to relatively poor
>> circuitry in the radio clock, which is why I built my NTP-controlled wall
>> clock!
>>
>>   http://www.satsignal.eu/raspberry-pi/DigitalClock.html
>>
>> One radio clock is below.  That particular MSF clock is actually not too
>> bad - visibly it's in sync with the NTP clock (which itself is within a few
>> microseconds of GPS time).
>>
>> 73,
>> David GM8ARV
>> --
>> SatSignal Software - Quality software written to your requirements
>> Web: http://www.satsignal.eu
>> Email: david-taylor at blueyonder.co.uk
>> .
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