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

[Phil Genera]

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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