[time-nuts] 60hz west coast electric grid gone berserk

Hal Murray hmurray at megapathdsl.net
Fri Sep 9 17:17:12 UTC 2011

> What software do you use for the monitoring?

Things are pretty simple if you have a Linux box.  Here is the code I'm using:

Kernel support to capture PPS info into NTP was developed many years ago.  
The API gives you a time stamp and a count.  Although the intention was 1 Hz, 
it works fine at 60 Hz.  It's available on recent Linux kernels and has been 
available on most/all *BSD systems for a long long time.

Linux also makes that info available via /sys/class/pps/pps0/assert so you 
can get at it with scripts and don't need to write/compile c code.
  [murray at shuksan]$ cat /sys/class/pps/pps0/assert
  [murray at shuksan]$ 

It wouldn't be hard to write something similar in c that would run on a BSD 

These are my opinions, not necessarily my employer's.  I hate spam.

More information about the time-nuts mailing list