[time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

[Chris Albertson]

The MAX3223 chip does exactly what you need.  It converts 3.3 volt serial
to RS232 levels.

You can buy just the chip and add a few passives to a perf board and make
what you need or buy a little PCB with the parts already soldered down like
this
http://www.ebay.com/itm/RS232-To-TTL-Converter-Module-Serial-Module-DB9-Connector...
<http://www.ebay.com/itm/RS232-To-TTL-Converter-Module-Serial-Module-DB9-Connector-3-3V-5-5V-Arduino-/172283748577?hash=item281ce960e1:g:Zq0AAOSwx2dYCwXH>

It is actually cheaper to buy the little PCB then to buy the parts to make
one

On Tue, Nov 8, 2016 at 7:23 PM, STR . <strykar at hotmail.com> wrote:

> >The signals on the DB9 connector are at RS232 levels, your GPS module is
> likely 3V3 CMOS, you will need to make a level translator if you wish to
> use a standard PC >RS232 serial port.
>
> Would this do the trick? - http://www.banggood.com/8-Channel-Logic-Level-
> Translator-Converter-Bi-Directional-Module-p-1023173.html
> I'll get some 3.3 and 5 V power supplies too.
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-- 

Chris Albertson
Redondo Beach, California