[time-nuts] Lady Heather coming soon to a Linux box near you...

[Nick Sayer]

Rather than use the Hat, you might consider just using the breakout board and just using hookup wires to connect it up. Connect up the Vin pin to +5, ground to ground, TX and RX to the serial port pins and the PPS pin to GPIO 18. That’ll save you $5, if nothing else.

Add

dtoverlay=pps-gpio,gpiopin=18

to config.txt, comment out the getty on ttyAMA0 in inittab, use dpkg-reconfigure to set up GPSD on /dev/ttyAMA0.

At that point, ppstest should see the PPS output and gpsmon should be able to see the GPS.

I believe it’s still the case at this point that you need to build a custom ntpd with support for the GPIO PPS driver, as it’s not turned on by default in the Raspberry Pi distro.

I did something very similar (wired the same, but I had made my own “cap” - not quite a hat - board for the GPS) to make my Pi Zero public NTP server.

> On Apr 22, 2016, at 12:36 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> paulswedb at gmail.com said:
>> As I recall there was work using the Pi 1 to make a ntp server and that
>> could use a simple gps receiver dedicated to the system. Its installation
>> was pretty simple. 
> 
> Adafruit sells a GPS HAT.  Some soldering required: the 40 pin header comes 
> loose.
> 
> Uputronics has one if you are in Europe.  It's slightly different.
> 
> 
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