I use Arduino Pro Mini. As I know, every MCU has a number. Different MCU has different number. How to get it ?

  • You should also know that not everything you know is so. – James Waldby - jwpat7 Dec 15 '16 at 20:45
  • Do you mean, every (single) chip has a unique number? Or does every type of chip have a signature? – Nick Gammon Dec 16 '16 at 7:15
  • @NickGammon I mean every single chip has a unique number. – lanse7pty Dec 16 '16 at 7:20

Arduino Pro mini is based on Atmega328 which does not have a unique ID. It has only device signature which you can read if you turn on Show verbose output during upload in Arduino IDE's File > Preferences.

  • But as I know , every Microchip have a unique number. – lanse7pty Dec 16 '16 at 5:09
  • Really? Where is this documented? – Nick Gammon Dec 16 '16 at 7:14

Could you be confusing the term micro-chip (often applied to any tiny, programmable electronic device) with the manufacturer named "Microchip" (who make the PIC series of micro-controllers, among many other products)? Microchip (the company) does make a line of products that have individually unique IDs. Most manufacturers do not provide unique IDs in their micro-controller devices, and AVR's Atmega 328 series devices do not have unique ID's.

  • Thanks, I understand you. Because I seemly remeber STM32 and 51 has unique ID, so I think 328 has too. – lanse7pty Dec 17 '16 at 5:30

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