On 6/26/11 10:38 AM, Poul-Henning Kamp wrote:
My idea for measuring this, was to measure the time from the
utc second from a GPS receiver to the first zero-crossing of
the grid, and try plot Magnus and my measurements together.
So, to make this easy on folks..
Seems the easiest PC hardware thing would be to use a sound card input..
left input is the 1pps, right input is 50/60Hz derived from some local
source (a wire hanging out is probably enough, but noisy.. a transformer
or capacitor coupling from power line would be better)..
We could have a little application that runs and grabs, say, 10 seconds
worth of sound card data, figures out the phase, and logs it (or does a
cURL to send it to a website as a HTTP POST).
Even better would be a little dedicated widget that does it. I wonder
if one of those sub-$100 retail plug in servers (like the POGO plug)
could do it.
I think if we could make the "end user price" <$100, and it's truly plug
and play (i.e. not a "get this from place A, and find part B surplus,
and make a cable, etc.), we could probably get a bunch of people to just
try it. I sure would, and I know a bunch of people at work for which
this is in the "yeah, I'd do it as a toy" kind of category, as long as
it's less than, say, a couple hours to fool with it.
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