Question relating Atmega8a-au

Hello, Guys
by the way, I have some pcs of atmega8a-au then want to use them but I have a question please:
atmega8a-au is has unique id?

The MiniCore core supports the atmega8.

how to read unique id of atmega8a-au ?
another question for atmega8a-au is it has real unique id I mean each chip different id?

I do not think it does. Read the datasheet.

A quick search for "unique", "identifier", and "GUID" show no results that indicate that the chip has an identifier.

That was my conclusion as well when I did a search.

How about these models atmega88-au & atmega168-au?

Nothing like that in the ATmega48A/PA/88A/PA/168A/PA/328/P datasheet.

Also checked the ATmega16U4/ATmega32U4 (Leonardo/Micro). No luck there either.

You can easily add a unique identifier by adding a DS18B20 temperature sensor. It's a OneWire device with a 64-bit globally unique address.

good idea :slight_smile:
is there any code for read address from ds18b20 & compare it with variable?

// Include the libraries we need
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

// arrays to hold device address
DeviceAddress MyID;

   Setup function. Here we do the basics
void setup(void)
  // start serial port

  // locate devices on the bus
  if (!sensors.getAddress(MyID, 0))
    Serial.println("Unable to find address for Device 0");
    while (1) {} // No DS18B20. Freeze here


void loop(void) {}

// function to print a device address
void printAddress(DeviceAddress deviceAddress)
  for (uint8_t i = 0; i < 8; i++)
    if (deviceAddress[i] < 16)
    Serial.print(deviceAddress[i], HEX);

tested code then address I got as : 287A9E459218027C
so next step how compare address iwith variable if correct can print right and if not correct print wrong?

const byte DesiredAddress[8] = 
{0x28, 0x7A, 0x9E, 0x45, 0x92, 0x18, 0x02, 0x7C};

boolean CheckAddress(DeviceAddress addr)
  for (int i=0; i<8; i++)
    if (addr[i] != DesiredAddress[i])
      return false;
  return true;

thanks for your help :slight_smile:

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