FYI: About serial number of Mega and Tiny devices

[soosp]

See the knowledge base article of Microchip about serial number of Mega and Tiny devices: https://microchip.my.site.com/s/article/Serial-number-in-AVR---Mega-Tiny-devices

[ricaun]

That's interesting, at the time I didn't find an official doc about the meaning of the Signature Byte.

The library was based on this old datasheet that has 9 bytes of Serial Number. This is the full article: https://loranow.com/uniqueid/

If you look at the MCU.md is using the same Signature Byte.

Byte Address --------- Description
0x0E --------- Lot Number 2nd Char
0x0F --------- Lot Number 1st Char
0x10 --------- Lot Number 4th Char
0x11 --------- Lot Number 3rd Char
0x12 --------- Lot Number 6th Char
0x13 --------- Lot Number 5th Char
0x14 --------- Reserved
0x15 --------- Wafer Number
0x16 --------- Y-coordinate
0x17 --------- X-coordinate

I'm glad I did it right, thanks for sharing.