Paolo, that is exactly what I was thinking of! Now I have to get a programmer and a small PIC or something similar and experiment with it!
/Martin On Sunday, 29 January 2017 21:38:11 UTC+1, Paolo Cravero wrote: > > Hi. > I use the SQW output of Maxim RTC ICs (or clones...) in my clocks. It is 1 > Hz/pps but I never measured its jitter: I read the time over the I2C bus > periodically. I believe they are related so on the long run you get the > same accuracy. And my cheap ds3231 modules are right on spot! > > My Arduino code in on github. Code snippet to activate the one pps: > > Wire.beginTransmission(0x68); > Wire.write((byte)0x0E); > Wire.write((byte)0x00); // control byte to set and enable 1 Hz SQW > output &B0000_0000 > Wire.endTransmission(); / > > > Paolo > > Il 29/Gen/2017 20:36, "Dekatron42" <[email protected] <javascript:>> > ha scritto: > > Hi, > > I just bought an old Nixie clock design by "Karlsson" that uses a 1pps > signal generator from what looks like a standard electronic clock with > hands, I also found this "inner look" at another Karlsson clock that > confirms what my clock contains more or less : > http://www.nixie.dk/~jthomas/autopsy.html > > What I wonder now is if anybody has hooked up a DS3231 with a small > microprocessor to set it to output a 1pps signal on its output? > > The current 1pps generator has a big spread in time so it is sometimes one > minute ahead and sometimes a minute behind but it also drags behind every > day and I'd like to do the simplest update to the circuit and I couldn't > find anything simpler with better precision than the DS3231 and then > program it to output 1pps - if you have another idea on how to do this I'm > all ears! > > Using a frequency divider on the 32KHz output would also be possible but I > couldn't find any small chip that divided that right away. > > I don't have good GPS reception in my apartment, otherwise I would have > used a small GPS-unit. > > /Martin > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/bd3f6694-55e2-43ac-b6e9-cd02a432b928%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/bd3f6694-55e2-43ac-b6e9-cd02a432b928%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e10e7661-2826-48aa-989c-2f35d388d245%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
