aureq / rpi-ntp-gps

GPS based NTP server on a Raspberry Pi 2

warning

This repository is merely usable as it's just a brain dump of my own work. Use at your own risk.

hardware

• Raspberry 2 (Could worrk on Raspberry 1 and Raspberry 3)
• RTC DS3231
  • LiR 2032 or CR2032
• Ublox neo 6M
  • GPS antena and SMA patch cable
• TFT Screen 480x320 3.5" for Raspberry 1 (Adafruit)
• Ethernet cable (Wi-Fi should be fine too)
• 5v - 2.5A power supply

hardware setup

• RTC DS3231

  • Insert the battery into the RTC module
  • Remove the diode if using a non-rechargeable battery (CR2032) from the RTC module
  • Connect the RTC to the I2C bus (SDA and SCL)
  • Connect SQW to GPIO 22
  • Connect VCC pin to 3.3v and GND pin to GND

• Ublox Neo 6M

  • Connect TX to UART0_RXD
  • Connect RX to UART0_TXD
  • Connect PPS to GPIO 4
  • Connect VCC pin to 3.3v and GND pin to GND

• TFT Screen 480x320 3.5"

  • Install screen on top of rPi header

Notes

In /boot/config.txt, it may be necessary to tweak the order for dtoverlay=pps-gpio,gpiopin=22 and dtoverlay=pps-gpio,gpiopin=4. /dev/pps0 should be linked to the GPS device on GPIO 4.

software

• NTPSec
  • INSTALL
• Lighttpd

software setup

• apt-get purge fake-hwclock
• apt-get install build-essential cpufrequtils fbi git i2c-tools lighttpd lsof pps-tools rrdtool -V
• mkdir /var/www/html/ntp/
• mkdir /var/lib/ntp/rrd/