Select File -> New -> Project -> leJOS -> leJOS EV3 Project .
Flash the image onto your microSD card using software like BalenaEtcher. Insert the card into the and boot it up. Connect the
LeJOS (pronounced like the Spanish word for "far") is a compact Java Virtual Machine (JVM) designed to replace the standard firmware on LEGO Mindstorms bricks (EV3 or NXT), allowing you to program advanced robots using Java. It offers a robust alternative to LEGO's block-based programming, supporting complex features like preemptive threads, exceptions, and extensive sensor libraries. This guide focuses on , the modern standard for the EV3 brick. 1. Prerequisites and Setup Hardware: LEGO Mindstorms EV3 Brick Go to product viewer dialog for this item. , microSD card (2GB - 32GB). Software: Java JDK (preferably 8), Eclipse IDE, and the download . Installation: Download the latest SD card image. Select File -> New -> Project -> leJOS -> leJOS EV3 Project
to your computer via USB to configure networking (Wi-Fi is recommended). 2. Development Environment Setup (Eclipse) Use Eclipse for Java Developers.
Ensure the leJOS libraries are included in your project build path. 3. Your First Program ("Hello World") Connect the LeJOS (pronounced like the Spanish word
Right-click your project -> leJOS -> Upload and Run on EV3 . 4. Core Concepts & API LeJOS, Java for Lego Mindstorms / Books
In Eclipse, go to Help -> Install New Software , and use the leJOS update site (found on the leJOS wiki) to install the plugin. Core Concepts & API LeJOS
Create a new Java class and use the following code to display text on the screen: