Hi,

This lib works like a Charm with ESP32 C3 except that all my device's low MAC are minus 1
original MAC is 84:F7:03:3B:49:ED
given Mac by the library is 84:F7:03:3B:49:EC

This is always the same with all my chip

Thanks for making this library available.

On the SAMD51 platform, the addresses to use are as follows:

#define SERIAL_NUMBER_WORD_0	*(volatile uint32_t*)(0x008061FC)
#define SERIAL_NUMBER_WORD_1	*(volatile uint32_t*)(0x00806010)
#define SERIAL_NUMBER_WORD_2	*(volatile uint32_t*)(0x00806014)
#define SERIAL_NUMBER_WORD_3	*(volatile uint32_t*)(0x00806018)

My board is a Feather M4; it can be detected by having ARDUINO_FEATHER_M4 defined, but there may be better/other ways of doing this (not sure if there is a SAMD21 vs SAMD51 definition).

Hello
I have arduino Nano.
How can I make the ID read when the chip is powered and compare it with the ID written in the code.
Thank you.

I tested in with a bunch of cheap chinese arduino nanos (Atmega328pb) and 2 of them resulted have the same UUID.

I've tried the examples on a nano 33 IoT and is not working. none.

Hi,

Maybe I'm doing something wrong but when trying your code ov pro mini 3V3 I'm always getting FF DF FF DF FF FF FF FF any clue?

extern ArduinoUniqueID _UniqueID; wastes RAM.
Usually, you need to check ID just once. And no need to have it globally.
Please, fix it.

After flashing a few dozen Mega2560 I stumbled on duplicate serial numbers.

Thank you for your library, i have tested it and got unique addresses for Arduino Mega. I have attached the unique address generated by your library, it is about 9 byte. I want to know how i can use the unique ID to address the Arduino. I'm doing a project that has many arduino and they are all controlled by another arduino which acts as a central control. How do i use the unique ID to send message or request data from a particular arduino board?.
Thank you

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

This should be copied in reverse since the architecture is little endian

	id[i * 4 + 0] = (uint8_t)(pdwUniqueID[i] >> 0);
	id[i * 4 + 1] = (uint8_t)(pdwUniqueID[i] >> 8);
	id[i * 4 + 2] = (uint8_t)(pdwUniqueID[i] >> 16);
	id[i * 4 + 3] = (uint8_t)(pdwUniqueID[i] >> 24);

Arduino has changed the definition of the Mbed core for RP2040 of ARDUINO_ARCH_MBED_RP2040 to ARDUINO_ARCH_RP2040

Thanks

It would be a good idea to add to the library: LGT8F328P-LQFP32 MiniEVB

Hi all,

I understand that this library is helping to read the unique ID of the MCU but I wanted to ask theoretically that we can write to the unique ID as well like to change it? Is it possible?

Please let me know.

Thanks,
AKshay

Loading this lib and selecting the new UNO R4 Minima lists the examples as incompatible.
Is there any way to get a unique ID from the UNO R4?
Using ethernet-shields it's very important to have a unique MAC adress. I did this on AVR in code using the unique ID from the board. That makes it easy not to forget generating a "unique" MAC when using more than one ethernet shield.

I read something that native USB support requires unique IDs. The UNO R4 has native USB like many other non-AVR-devices. So maybe there is a "native" arduino command for that?

Any ideas?
Thanks

Nice useful library.
Had a quick look at the code and noticed that you can have the same deviceID for different device types.
By adding type information - could be an enum of supported types - the uniqueness can be multi processor.

reserving 2 bytes for the type would allow you to add a new device type every day for 160-180 years

Tested on an Arduino Micro the ArduinoUniqueID example tries to send serial data before comms are established and ends up sending nothing! Adding <while (!SerialUSB);> just after serial.begin fixed this issue for me :)
This issue also occurred for the ArduinoUniqueID8 example but the ArduinoUniqueIDSerialUSB example already had it and works all good!

If PlatformIO is used as the compiler for an Arduino sketch the 2nd time the include file is used it causes a compilation issue.
expected ')' before '.' token Line 51

This is not seen under Arduino IDE as it creates a single source code file before it compiles.