When you have written these files to the card, safely remove it, put it in the EV3 and boot the EV3. The file is available at You will need to create a free Oracle account, if you do not have one. You should then unzip the lejosimage.zip file from the leJOS home directory to the root directory of the card, and download and copy the Oracle JRE. If your card does not have a FAT32 partition, you can use a partition utility to reformat it as FAT32, or write the sd500.img file in the sd500.zip file (which is part of the distribution) to the disk as an image file (using dd or a disk image writing utility). SDXC cards are not supported by the EV3 hardware. The card itself should be at least 1GB and no more than 32GB. To do this you need an empty SD card with a FAT32 partition of at least 200MB. To get the source for the SD card Linux system, you should go to the Git ev3sdcard repository.Īfter you have installed leJOS on your PC, you will need to create an SD card. The development source of leJOS is available in the file. To use the leJOS samples you should import the samples.zip file into Eclipse. You can also set LEJOS_EV3_JAVA_HOME if you want leJOS to use a specific version of the JDK. LeJOS home directory and include the bin directory on your PATH. ![]() To use the command line tools, you should set the environment variables EV3_HOME to point to the If you are not an Eclipse user or do not want to use the plugin, see for an alternative way to create runnable jar files and upload them to the EV3. Setting to the directory that you unpacked leJOS to (the leJOS home directory). If you are using Eclipse, you can install the Eclipse plugin, and set the EV3_HOME preference There is a step by step guide for Mac OS X provided by a leJOS user here: If you're using Linux or Mac OS X, then download a file named leJOS_EV3_.tar.gz from the leJOS EV3 download page and unpack it. To install leJOS on Microsoft Windows, see ![]() We recommend that you use the following program to format the card: Even if the card is new it is worth using this program as SD cards sometimes have hidden partitions on them which can cause problems with the EV3. The card needs to be formatted with a FAT32 partition. To install leJOS you will need a blank SD card of at least 2GB and no more than 32GB.
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