[time-nuts] Need Time Help
Hal Murray
hmurray at megapathdsl.net
Tue Oct 4 03:58:15 EDT 2016
david-taylor at blueyonder.co.uk said:
> You can use a GPS puck or equivalent with PPS output to get the sort of
> accuracy you need. ..:
PPS output is only half the battle. You also have to get it into the system
that needs it.
A modem control signal on an old fashioned serial port (not USB) is the
classic approach. Unfortunately, many modern systems, especially laptops,
don't have serial ports.
GPIO pins on things like a Raspberry Pi also work well.
PPS over USB adds the USB polling interval to the error budget. It will
probably work well enough if the goal is under 15 ms.
--
These are my opinions. I hate spam.
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