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

Collins, Graham CollinG at navcanada.ca
Fri Oct 4 07:03:24 EDT 2013


No, my code is not posted anywhere but I would be glad to email it to anyone interested.

Cheers, Graham 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Phil Genera
Sent: October-03-13 6:44 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] A man with two clocks...

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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