Raspberry Pi - Read unique ID of a Raspberry Pi

Normally, all data on a Raspberry Pi is located on the inserted SD card. This has the advantage that you can simply insert a ready-to-use SD card into another Raspberry Pi. If, for example, your Raspberry Pi is damaged, all you have to do is insert the SD card into workable hardware and you can continue.

But what if you want to clearly identify the hardware used - i.e. the mainboard or the hardware of the Raspberry Pi? A serial number would be very helpful.

Unfortunately there is no special serial number for the Raspberry Pi hardware. But what can be read is the serial number of the CPU. And since this is permanently soldered to the rest of the hardware and is very difficult or impossible to replace for most people, it can be used as a serial number to identify the Raspberry Pi board.

How you can read the serial number of your Raspberry Pi or its CPU is described in the following article.

Safety instructions

I know the following notes are always kind of annoying and seem unnecessary. Unfortunately, many people who knew "better" have lost eyes, fingers or other things due to carelessness or injured themselves. Data loss is almost negligible in comparison, but even these can be really annoying. Therefore, please take five minutes to read the safety instructions. Because even the coolest project is not worth injury or other trouble.

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Helpful articles:
Before you start with this article, you should have prepared a Raspberry Pi so that it can be accessed via the network and controlled via SSH.

The following articles describe what needs to be done to prepare the Raspberry Pi.

In the following lists you will find all the parts you need to implement this article.

Required tool:

1xScrewdriver set  Buy at Amazon
1xSD card reader  Buy at Amazon

Required material:

1x Raspberry Pi  Buy at Amazon
1x Raspberry Pi power supply  Buy at Amazon
1x Raspberry Pi case  Buy at Amazon
1x Micro SD card 64GB  Buy at Amazon

Log in to the RaspberryPi via SSH

To start, you must first log in to the Rasp Pi with Putty via SSH. How to do this is in the article RaspberryPi - Control the RaspberryPi via SSH described.

After entering your username and password you can enter the first commands.

Read out the ID or serial number of the CPU of the Raspberry Pi

The CPU serial number is included in the information about the CPU. These can be read very easily with the following command.

So just give the command:

cat /proc/cpuinfo

into the console of the Raspberry Pi.

You will then be shown the following information about the Raspberry Pi's CPU.

The second line from the bottom also contains the serial number, which is unique for each Raspberry Pi.

With this command you can get all the information about the CPU including the serial number. But what if you just want to see the serial number?

To only get the serial number, you can combine a few commands.

For example, enter the following command.

cat /proc/cpuinfo | grepSerial | cut -d ":" -f2

The CPU information is thereby retrieved, the serial number is filtered out and output.

Read out the ID or serial number of the Raspberry Pi with Node Red

With Node Red you can automate the retrieval of the serial number and then process it directly.

For example, you could use the serial number to uniquely identify each Raspberry Pi using Node Red.

View of the Node Red Flow in the configuration interface.

You can find the Node Red code in the Nerdiy Git repository at the following link:

How you can import this into your Nod eRed environment is in the article NodeRed - import and export node code described.

More articles on the topic

In the following categories you will find further links on the subject of Rasperry PI and Node Red.

Have fun with the project

I hope everything worked as described for you. If not or you have questions or suggestions please let me know in the comments. I will then add this to the article if necessary.
Ideas for new projects are always welcome. 🙂

PS Many of these projects - especially the hardware projects - cost a lot of time and money. Of course I do this because I enjoy it, but if you think it's cool that I share the information with you, I would be happy about a small donation to the coffee fund. 🙂

Buy Me a Coffee at ko-fi.com       

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