Is your code posted anywhere? I've been meaning to do roughly the same. -- Phil On Oct 3, 2013 12:07 PM, "Collins, Graham" <coll...@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-tay...@blueyonder.co.uk > . > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
