To encode the Hardware Revision number, so that we know what the version numbers of the main PCB is and is available to the Microcontroller. Arduino Post Hardware Version Numbers
we use the "ArduinoUniqueID" Arduino library, to give us the Unique ID serial number of the Arduino we are using. Arduino Post Arduino Serial Number4 Comments
It is helpful to know when the firmware on the device was compiled, it can be displayed on a screen, or sent viewed over serial. Arduino Post Projects Storing when an Arduino sketch was Compiled7 Comments