[time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd
Gary E. Miller
gem at rellim.com
Wed Nov 9 05:52:21 UTC 2016
Yo Hal!
On Tue, 08 Nov 2016 21:13:05 -0800
Hal Murray <hmurray at megapathdsl.net> wrote:
> strykar at hotmail.com said:
> > Would this do the trick? -
> > http://www.banggood.com/8-Channel-Logic-Level-Tran
> > slator-Converter-Bi-Directional-Module-p-1023173.html
>
> Not likely.
>
> The normal RS-232 level shifter chip includes an inverter. (No good
> reason, just historical, but with a long history.)
Who cares if the PPS is inverted?
> I can't understand the schematic on the part Gary suggested. I'd use
> something like this:
> https://www.sparkfun.com/products/11189
I admit to not spending a lot of time on my suggestion. Yours may well
be better.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem at rellim.com Tel:+1 541 382 8588
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