NTP Server aims to be a stratum 1 level, with:

• RaspberyPi 2
• GPS module with PPS output
• Kernel PPS module usage into NTP server
• based on Debian 8 (creation of projet on June 26, 2016 : ok, it's a long time ago... but still working :-) )

Image & Video in docs directory

LICENCE

You can use, and/or modify freely, BUT, you have to share here any changes (through an issue and/or a push request). You're not allowed to use for commercial purposes in any way.

Building

So, GPS module is connected like:

• TX pin on the RX serial console of the rpi
• PPS pin plug on the GPIO 18

LED display parts are connected like:

• RED led on the GPIO 5
• YELLOW led on the GPIO 13
• GREEN led on the GPIO 26
• =>GPIO are configured as pull-down mode for those pins.

To install, you have to:

• Create a basic debian image on a SDCard
• insert into and start your Rpi
• configure your network, I suggest you to set it in static
• update and install git
• clone the repo
• add pps-rules
• add specific conf from cmdline
• add specific conf from config.txt
• add module
• link rc.local
• apply iptables rules v4 and v6 (for now, I blocked all ipv6, but I know I'll have to change that)
• add symlink
• remove ntpd
• download ntp sources, then compile/install with configure-ntpd.sh => this is to add PPS kernel support
• install ntp.conf
• reboot and check : when you're GPS is synchronised (cat /dev/gps0 and check RMC/GGA frame), you should have a cross in front of 127.127.20.0 and a 'o' in front of 127.127.22.0

Keywords

ntp gps pps server stratum 0 1 raspberry pi gpio ntpd linux