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]> 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
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