Additional pps-gpio

[Achim Gratz]

Hal Murray via devel writes:
> You can build your own with PPS by adding a few wires to the combination of a 
> GPS breakout board and a USB-serial with breakout on the serial side.  There 
> is at least one USB-serial chip available on a breakout that polls at 1/4 ms. 
>  I'll look up part numbers that I'm using if anybody is interested.

Thanks, but I already have plenty of those.  For a moment I was hoping
that the NaviSys USB stick and puck I bought earlier would be able to
send PPS over USB, but that's not the case (they are both using the
built-in USB interface that uBlox provides).  The puck does have a PPS
output that I need to break out (PPS is not officially supported in that
model so the driver circuit is missing, but that gives me a convenient
location to solder the wire to).  The stick has no convenient way to
open the case, so I'll probably leave it alone.


Regards,
Achim.
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