10 MHz reference Signal Generator using Arduino Nano

This is a project for a 10 MHz GPS Disciplined Oscillator (GPSDO) designed around an Arduino Nano. It provides a highly accurate and precise 10 MHz signal that can be used to improve the accuracy and precision of other laboratory devices (arbitrary waveform generators, signal generators, VNAs, spectrum analyzers, etc.). It uses a GPS one-pulse-per second (1PPS) signal from an inexpensive module.
The download has files for the enclosure as well as all files to build the GPSDO. Files include schematic, BOM (parts list), PCB files, Arduino sketch file (source code), label artwork, operating instructions, etc.

Arduino hobbyist may find some interesting code examples in this source code such as:

Multiple operation pushbutton (short and long press)
Using a Analog input for a pushbutton
Creating custom characters for LCDs
Creating a histogram on a 4-line, non-graphical LCD
Statistics code for rolling calculation on 64 bit numbers
Using the watchdog timer to monitor external events
Combining PWMs for higher resolution
Simple boxcar filtering
Disabling specific interrupts
Formatting large numbers for display (adding commas and decimal points)
Writing data periodically to the EEPROM to minimize wear
Using a bi-color LED on a single I/O line

Note that the main enclosure incorporates a RJ45 Keystone Socket that I borrowed from pyr0ball ( https://www.thingiverse.com/thing:2395315 )

The LCD enclosure can be found at:
https://www.thingiverse.com/thing:4589751

A GPS enclosure used on this project can be found at:
https://www.thingiverse.com/thing:4592527
or
https://www.thingiverse.com/thing:4633005

This was featured on EDN.com : https://www.edn.com/simple-gps-disciplined-10mhz-reference-uses-dual-pwms/

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