[time-nuts] Need Time Help

[Hal Murray]

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.





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