Arduino NTP server

This is a work-in-progress that will eventually allow the Arduino to act as an NTP time server using time data from GPS satellites.

Prerequisites

• [Arduino Mega2560 or equivalent] 1
• [GPS shield] 2 with appropriate [GPS module] 3 that outputs NMEA data. Tested with EM-406.
• Ethernet shield.

Setup Guide

• (optional) Solder wire from INT jumper on bottom of Ethernet shield to pin 48. Comment out ETH_RX_PIN in config.h if not done.
• Solder 1PPS output from GPS to pin 49. GPS Shield currently comes with this unattached on the PCB.
• Solder GPS RX/TX pins to the appropriate Serial1-3 pins. By default, GPS RX/TX is on pins 18 and 19, respectively, but this can be changed in config.h.
• Assemble board and shields. GPS should be on top, Ethernet in the middle and the Mega2560 on the bottom.
• Open sketch in the Arduino IDE.
• Verify that everything in ArduinoNTPd/config.cpp and config.h look okay.
• Upload sketch to board (right arrow button at the upper-left).

Licensing

New BSD license.

Unit testing code on PC

$ cd test; sh runTestApps.sh
Current time (seconds since 1900): 3579060209