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

Doug Calvert dfc-list at douglasfcalvert.net
Fri Sep 9 18:26:03 UTC 2011

The OP mentioned something about pulling data from Washington (i think
he was in nevada/utah). Where can you access power grid data like that
over the internet?

On Fri, Sep 9, 2011 at 1:17 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
>> 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:
>  http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz.py
> 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
>  1315583280.999957314#763070
>  [murray at shuksan]$
> It wouldn't be hard to write something similar in c that would run on a BSD
> box.
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
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