I've noticed that on my RPI as well, Time stability improved greatly when connected to a simple and well cooled 7805 voltage regulator. My RPI (GPS PPS) runs at about +/- 2 uS on a somewhat medium CPU sytem load. Good enough for my needs.
Frits On 5/24/15, Attila Kinali <att...@kinali.ch> wrote: > On Wed, 13 May 2015 09:07:44 -0500 > bownes <bow...@gmail.com> wrote: > > >> For the advocates of RPi solutions, I put about half a dozen in to support >> >> some non mission critical infrastructure about a year ago. We are using >> them >> for for logging, reading QR codes, running a vending machine, kiosk web >> browsers, and similar tasks. In short, nothing requiring heavily lifting. >> >> >> I've been incredibly dissappointed in the results. Well over half of them >> >> have needed replacement and not a one runs reliably. They need rebooting >> at >> intervals from hours to a few tens of days to recover from total lock up. >> >> The problem is not environmental, power or SD cards. > > Do you know what the problem is? > > I know that the RPI has pretty cheap design (like most of these super-cheap > SoC boards) and does suffer from a few problems. The most common one > is under-designed power supply. Together with the ultra-cheap wall-wart > supplies mostly used results in a quite decreased MTBF due to spikes/drops > on the power rails (BTW: soekris suffers from that too, just that a better > wall-wart supply doesn't help). Depending on the environment, in which > those boards are run, overheating might also be a problem. > > Other than that, i am not aware of any software or hardware issues that > would cause the RPI, or any other board, to run unreliably. > > Attila Kinali > -- > < _av500_> phd is easy > < _av500_> getting dsl is hard > _______________________________________________ > 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. > -- vbradio.wordpress.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.