Precision Timekeeping Fuckery

How it works

Services

• gpsd
• chrony
• telegraf
• influxdb
• grafana-server
• syslog-ng

Testing

Status (Everything)

• bash ~/Precision-Timekeeping-Fuckery/full_status.sh

Status (Services)

• bash ~/Precision-Timekeeping-Fuckery/status_services.sh

Test PPS

• sudo ppstest /dev/pps0

Logs Stuff

Chrony Logs

• sudo tail -f /var/log/chrony/tracking.log
• sudo tail -f /var/log/chrony/statistics.log
• sudo tail -f /var/log/chrony/measurements.log

Telegraf Logs

• sudo tail -f /var/log/telegraf/telegraf.log

Grafana Logs

• sudo tail -f /var/log/grafana/grafana.log

Influxdb Logs

• sudo tail -f /var/log/syslog

Root Crontab Logs

• sudo tail -f /var/log/root-crontab.log

Setup

Requirements

1. Raspberry Pi 4+
2. A timing specific GPS module
3. I2C RTC Module
   1. battery for RTC Module
4. Jumper wire to wire it up

Wiring

Pins and Wiring Guide

OS

1. Raspberry Pi OS 64 bit lite
   1. Raspberry Pi imager
   2. Configure in imager
      1. hostname: grandmasterclock
      2. enable ssh
      3. ssh key
      4. username
      5. password
      6. locale
      7. keyboard

Software (Auto)

WILL REBOOT IN BETWEEN EACH COMMAND

1. curl -s https://raw.githubusercontent.com/PrincessPi3/Precision-Timekeeping-Fuckery/refs/heads/main/time_fuckery.sh?nocache=$RANDOM | $SHELL
2. git -C ~/Precision-Timekeeping-Fuckery pull && bash ~/Precision-Timekeeping-Fuckery/time_fuckery.sh
   1. each reboot run the above command a total of four (4) times
3. https://grandfatherclock:3000
   1. default login: admin and admin
      1. set new password
   2. data sources->add new->influx db
      1. name "influxdb1"
      2. query languagew: influxql
      3. http
         1. url: http://127.0.0.1:8086
         2. timeout seconds: 3
      4. database: Chrony_Stats
      5. user, pass: blank
      6. save and test
   3. Dashboards->New-Import
      1. Upload Garfana-Visualization.json raspi-config Run raspi-config
4. Interface Options->Serial Port
   1. Would you like a login shell to be accessible over serial?
   2. Would you like the serial port hardware to be enabled?
5. Interface Options-I2C
   1. Enable Yes
6. Advanced Options 1. A1 Expand Filesystem

Clients

Windows

1. Open the Control Panel and navigate to the Date and Time settings.
2. Click on "Internet Time" and then "Change settings".
3. Enable the option to "Synchronize with an Internet time server".
4. Choose a time server from the available list or enter a custom one.
5. Click "OK" to save the changes.

Links

Helpful Guide https://austinsnerdythings.com/2025/02/14/revisiting-microsecond-accurate-ntp-for-raspberry-pi-with-gps-pps-in-2025/

Old Module

• Chipset https://www.u-blox.com/en/product/neo-f10n-module
• Breakout https://docs.sparkfun.com/SparkFun_u-blox_NEO-F10N/single_page/

Current Module

• Chipset https://www.u-blox.com/en/product/neolea-m8t-series
• Breakout https://www.ebay.com/itm/134243322249

U-Blox Software (U-Center) https://www.u-blox.com/en/product/u-center