[time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?
Gary E. Miller
gem at rellim.com
Wed Oct 18 20:11:16 UTC 2017
Yo Hal!
On Wed, 18 Oct 2017 12:26:27 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:
> > For under a $100 you could get a Raspberry Pi, a GPS HAT, and
> > connect your input to a GPIO pin. Configure ntpd to log the real
> > PPS and the input as another 'PPS'.
>
> Is there an option to log all individual PPS events?
# ppswatch /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
timestamp: 1508356708, sequence: 591837, offset: 1412510
timestamp: 1508356709, sequence: 591838, offset: 1381010
timestamp: 1508356709, sequence: 591838, offset: 1381010
timestamp: 1508356710, sequence: 591839, offset: 1397496
timestamp: 1508356710, sequence: 591839, offset: 1397496
Just redirect to a log file.
> The $100 for a Pi might be significantly low. It depends on what you
> have in your toy box.
Looking at Amazon, quantity one, I see:
RasPi3 $35
GPS Hat w/ remote antenna and cord: $30
16BG miscro sd card: $9
RaspI + HAT case: $10
USB charger: $8
USB charge cable: $2
Cat5 ethernet cable: $2
Looks like $96 to me. You can save some if you buy in bulk,
Plus labor, which after the first one is small.
> For getting started, you also need:
> SD card reader/writer
> keyboard and mouse (Pi has USB)
> display adapter (Pi is HDMI)
> display
Yeah, just for setup. Shall we include the price of the desk it sits
and the building it is in?
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem at rellim.com Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can’t measure it, you can’t improve it." - Lord Kelvin
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