> I'm experimenting a bit with time keeping. > For that I use cheap low power hardware like raspberry pies and > arduinos.
Hi people, Thanks for all the replies! Took a bit to respond but I had the flu. My objective is, to get the best precision/accuracy possible with said hardware. The first step is preparing an arduino. I found one that has an easy to desolder crystal: http://upload.wikimedia.org/wikipedia/commons/thumb/0/04/Arduino_Mini.jpg/170px-Arduino_Mini.jpg Bought a couple of those and some of these: http://www.aliexpress.com/item/Precision-TCXO-square-wave-oscillator-TCXO-16-9344MHz-line-rectangle/1104200137.html While waiting for these and the parts for the schematics, I'm toying around with implementing ntp servers (well, sntp) for arduino. With lots of blinkenlights of course and with ethernet. Not trivial I can say. This is the jitter plot of a test where time is fed from an RTC module. I did not plot the drift but it is +/- 120 seconds in the 3.8 days I measured it. http://vps001.vanheusden.com/~folkert/aRTC.png Folkert van Heusden -- ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com _______________________________________________ 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.