Do Atmega328 chips have pseudo-unique IDs?
The Atmega328 does not come with a hard coded UID (unlike the XMEGA and the Atmel 32-bit devices)

From what i understand you want to use some kind of unique ID for dressing purposes. I can think of some options that may meet your requirements.


Select a unique address by setting some external jumpers on dedicated I/Os.
Program a UID to flash or EEPROM during production.
Interface an external chip that provides a UID.
Make the address configurable by software (UART debug interface for example).