OpenCV (Open Source Computer Vision Library) is a software library focused on real-time computer vision applications. It's used for image processing, object detection, and machine learning, crucial for the AI in our LEGO sorting machine.

What programming language should I use?

Python is highly recommended due to its extensive libraries for machine learning and computer vision, such as OpenCV and TensorFlow. It's also relatively easy to learn, making it ideal for beginners.

How much will this project cost?

The cost can vary depending on the components you choose, but you can expect to spend anywhere from $100 to $300. The Raspberry Pi, camera module, and servo motors are the most significant expenses.

Do I need prior experience with machine learning?

While prior experience is helpful, it's not strictly necessary. There are many online resources and tutorials that can guide you through the process of training a machine learning model for LEGO brick recognition.

What type of camera is best for this project?

The Raspberry Pi Camera Module V2 is a popular and affordable option. It provides good image quality and is easy to integrate with the Raspberry Pi. However, you can also use a USB webcam if you prefer.

How accurate can a LEGO sorting machine be?

The accuracy of your sorting machine will depend on the quality of your AI model and the precision of your sorting mechanism. With careful training and calibration, you can achieve a high level of accuracy, but some errors are inevitable.

Can I sort LEGO Technic pieces with this machine?

Yes, you can sort LEGO Technic pieces, but it may require more sophisticated image recognition techniques and a more complex sorting mechanism due to their unique shapes and features.

Programming

Building an AI LEGO Sorting Machine: Raspberry Pi + OpenCV Tutorial

Brick by Brick Editorial Team 6 min read 5 views

Last Updated: November 26, 2025

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Imagine sorting your LEGO collection with the precision of a robot! This article explores building an AI-powered LEGO sorting machine using a Raspberry Pi and OpenCV, a powerful computer vision library. We'll break down the process, discuss necessary components, and highlight LEGO sets perfect for testing your new creation. Whether you're a seasoned programmer or a LEGO enthusiast eager to dive into the world of robotics, this tutorial will guide you through the exciting intersection of AI and LEGO.

Why Build a LEGO Sorting Machine?

Why spend hours manually sorting through your mountain of LEGO bricks when you can automate the process? Building a LEGO sorting machine is a fun and challenging project that combines your love for LEGO with the exciting fields of computer science and robotics. This project not only saves you time and effort but also provides a hands-on learning experience in areas like image recognition, machine learning, and hardware integration. Plus, the satisfaction of watching your robot accurately categorize your LEGO collection is unparalleled. It's a great way to organize your collection, making it easier to find the pieces you need for your next MOC (My Own Creation – a custom LEGO design).

Components for Your AI LEGO Sorter

To embark on this ambitious project, you'll need a few key components. Here's a breakdown:

Raspberry Pi: The brain of your operation. A Raspberry Pi 4 or 5 is recommended for its processing power. Consider the Raspberry Pi 4 Model B with 4GB or 8GB of RAM for optimal performance. Raspberry Pi 4
Camera: A Raspberry Pi-compatible camera module to capture images of the LEGO bricks. The Raspberry Pi Camera Module V2 is a popular and affordable choice. Raspberry Pi Camera
Servo Motors: For physically sorting the LEGO bricks. You'll need multiple servo motors to control the sorting mechanism. Consider using micro servo motors for smaller bricks. Micro Servo Motors
LEGO Bricks: Of course! You'll need a diverse collection of LEGO bricks to train and test your sorting machine. Sets like the LEGO Classic sets are a great starting point, offering a wide variety of colors and shapes.
Software:
- Raspberry Pi OS: The operating system for your Raspberry Pi.
- Python: The programming language used to control the machine.
- OpenCV: A powerful open-source computer vision library for image processing and object detection.
- TensorFlow/Keras (Optional):
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- Trevi Fountain (21062):
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- Notre-Dame de Paris (21061): The Notre-Dame de Paris set released in 2024, can be used to test the LEGO sorter machine. With its array of colors, it is an ideal set to use in the sorter. Find it here: on Amazon.
LEGO Classic Sets

These sets offer a wide range of basic bricks in various colors and sizes, making them ideal for training your AI model to recognize different brick types.
- LEGO Classic sets are perfect for building up your LEGO collection and providing a diverse range of bricks for your sorting machine. LEGO Classic sets
LEGO Art Sets

LEGO Art sets often contain a large number of small, colorful tiles, which can be challenging for a sorting machine but also provide a great opportunity to test its precision.
- The LEGO Art Project - Create Together features a collaborative art set that can be built in multiple ways.
What to Consider When Buying

Before diving into this project, here are a few things to keep in mind:
- Your skill level: This project can be quite challenging, so it's important to have some experience with programming and electronics.
- Your budget: The cost of the components can add up, so set a budget before you start.
- The size of your LEGO collection: If you have a large collection, you'll need a more robust sorting machine with more sorting bins.
- The types of LEGO bricks you want to sort: Some LEGO bricks are more difficult to sort than others, so consider the complexity of your collection when designing your machine.
Conclusion

Building an AI LEGO sorting machine is a rewarding project that combines your passion for LEGO with the exciting world of computer science and robotics. By following this tutorial and using the right components, you can create a machine that will save you time, organize your LEGO collection, and provide a valuable learning experience. So, gather your LEGO bricks, fire up your Raspberry Pi, and get ready to build!

Build an AI LEGO sorting machine using Raspberry Pi & OpenCV! Learn the components, steps, & best LEGO sets for testing. Automate your LEGO organization today!

LEGO, sorting machine, Raspberry Pi, OpenCV, AI, machine learning, robotics, LEGO Architecture, Neuschwanstein Castle, Trevi Fountain, The White House

Discover how to build an AI-powered LEGO sorting machine using a Raspberry Pi and OpenCV. This comprehensive tutorial covers components, step-by-step instructions, and recommended LEGO sets for testing.