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A project to learn Java and create software for Mindstorms Robots using hardware supported by EV3Dev & the LeJOS way.
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ev3dev-lang-java/ev3dev-lang-java
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README.md
EV3Dev-lang-Java is project to learn Java and create software for Mindstorms Robots using hardware supported by EV3Dev & the LeJOS way.
For non Linux computers use:
In Lego Mindstorms ecosystem, the default solution to develop Java software for Lego Mindstorms was LeJOS but now exists one alternative, EV3Dev-lang-java a Java project running on the top of EV3Dev.
Lego Mindstorms ecosystem is a nice educational way to learn Java programming in general and Robotics in particular . Now, it is possible to install a complete Linux distro in the third generation of the product and others companies like Mindsensors & Dexter Industries has released products which interact with Sensors & Actuators from Lego ecosystem and that boards can use the Power of the popular board Raspberry Pi 3
But, with the help of EV3Dev , it is possible to have the same Linux experience for multiple boards. So. why not develop a Java library for that Linux Distro? The answer is EV3Dev-lang-java . The project, takes the good things of both worlds: EV3Dev with the complete linux experience and LeJOS with the rich local navigation stack and the remote support in the future.
What Debian versions are supported with this library?
The library has support for Debian Jessie & Debian Stretch . In this release, we have finished the support for Debian Stretch for EV3 and you could use OpenJDK 11, or OpenJDK 15 and it is amazing!
If you need to use any Raspberry Pi Boards, I recommend to use the stable EV3Dev Debian Jessie release.
What is the hardware platforms supported in this project?
Using the same Java objects, it is possible to deploy the software for Robots on EV3 Brick, Raspberry Pi 3 with BrickPi 3 & PiStorms.
| # | Element | EV3 P-Brick | Raspberry Pi 3 Model B+ |
|---|---|---|---|
| 1 | Hardware | EV3 Brick | BrickPi+, BrickPi3, PiStorms |
| 2 | SoC | TI Sitara AM1808 | Broadcom BCM2837B0 |
| 3 | CPU | 1× ARM926EJ-S @ 300MHz (max 456MHz) | 4× ARM Cortex-A53 @ 1400MHz |
| 4 | RAM | 64 MB LPDDR | 1024 MB LPDDR2 (900 MHz) |
| 5 | USB Host | 1× USB 1.1 (without onboard hub) | 4× USB 2.0 (from onboard hub) |
| 6 | Year | 2010 | 2018 |
The project has been designed with the following solution in mind:
| # | Layer | Option 1 | Option 2 |
|---|---|---|---|
| 1 | Platforms | BrickPi BrickPi3 PiStorms | EV3 |
| 2 | OS | Debian Jessie | Debian Jessie/Stretch |
| 3 | JVM | OpenJDK 15 | OpenJDK JRI 11 / 12 / 13 / 14 / 15 |
| 4 | EV3Dev Kernel | 4.4.47-19-ev3dev-rpi2 | 4.14.71-ev3dev-2.3.0-ev3 |
| 5 | ev3dev-lang-java | 0.7.0 | 2.4.12 |
Note: At the moment, we will maintain the whole solution until the next LEGO Mindstorms product estimated for next January of 2022.
Features included in the whole project
Java features
- OpenJDK Java 11/12/13/14/15 support for EV3 Brick, Brickpi+/PiStorms + Raspberry Pi 3
- Java profiling tools Support (Oracle mission control & JConsole)
- Logging support based on SLF4J
- Centralized logs with Kibana
Platform features
Lego Mindstorms features
- Regulated Motor Support
- Unregulated Motor Support
- Sensor Support (EV3 sensors)
- Sounds Support
- EV3 LCD Support
- Automatic installation of OpenCV
- eSpeak TTS (Text to speech) Support
- LeJOS Sensor filter Support
- LeJOS local navigation stack Support
- RPLidar A1/A2 (2D Lidar) Support
- OpenJDK for EV3: A custom OpenJDK JRI/JDK (9,10,11,12) build for EV3
- EV3Dev-lang-java: Low level integration with EV3Dev
- lejos-commons: LeJOS interfaces & utilities
- Installer: A set of Bash scripts to automate some operations with your brick
- Template project: A Gradle project ready to test the project
- Examples: A repository with several examples about the usage of this project
- lejos-navigation: LeJOS navigation stack
- Usb Devices: A library to use Arduino, Grove Sensors, GPS, IMU, LIDAR, and more devices.
- ROS: A library to publish Sensor data to ROS for SLAM purposes
Review the backlog to follow the features in course:
Take a look the documentation to use the project:
and use this easy template project with examples to use the project in a quick way:
Take a look the following repository to learn how to use this project:
Architecture decision record (ADR)
- LeJOS: http://www.lejos.org/
- LeJOS Git: http://sourceforge.net/p/lejos/ev3/code/ci/master/tree/
- LeJOS Forum: https://lejos.sourceforge.io/forum/search.php?keywords=ev3dev&sid=8642d9d1b361bcfdcdeabb26db89e632
- EV3Dev: http://www.ev3dev.org/
- EV3Dev // Getting Started: http://www.ev3dev.org/docs/getting-started/
- EVEDev // Linux Kernel Drivers: http://docs.ev3dev.org/projects/lego-linux-drivers/en/ev3dev-jessie/
- Dexter Forum: http://forum.dexterindustries.com/search?q=java
- AdoptOpenJDK CI: https://ci.adoptopenjdk.net/view/ev3dev/
- OpenJDK: https://openjdk.java.net/
About
A project to learn Java and create software for Mindstorms Robots using hardware supported by EV3Dev & the LeJOS way.
Lego mindstorms with java
Java for LEGO® Mindstorms® EV3
LEGO® Mindstorms® EV3 can run the ARMv5 port of Java SE Embedded with just a few simple steps. This page will help point you to all the resources you need to get started!
- See a video of Java SE Embedded on LEGO® Mindstorms® EV3.
- Guide on how to run Java on Lego EV3 via leJOS wiki (not affiliated with LEGO® or Oracle).
- More information about Java on LEGO® Mindstorms® can be found at the leJOS community site (not affiliated with LEGO® or Oracle).
- The leJOS community is working on enabling LeJOS on MINDSTORMS EV3. Oracle is making our Java implementation available here to support their efforts. For now, please consult the leJOS forums for status and updates.
- If you’re feeling adventurous after reading up some of the above links, Download either the Java SE Embedded 8 update 6 ARMv5 port or Java SE Embedded 7 Update 71 ARMv5 port (see below).
- Java SE Embedded 8 update 6 enables developers to create customized JREs using the JRECreate tool. Starting with Java SE Embedded 8, individual JRE downloads for embedded platforms are no longer provided. To get started, download the bundle below and follow instructions to create a JRE that suits your application’s needs.
Oracle Java SE Embedded version 8 Update 33
Product / File Description
File Size
Download
Oracle Java SE Embedded version 7 Update 75
Product / File Description
File Size
Download
More Information
NOTICE
LEGO, the LEGO logo, MINDSTORMS and the MINDSTORMS logo are trademarks of the/sont des marques de commerce de/son marcas registradas de LEGO Group. ©2014 The LEGO Group.
Lego mindstorms with java
Java for LEGO® Mindstorms® EV3
LEGO® Mindstorms® EV3 can run the ARMv5 port of Java SE Embedded with just a few simple steps. This page will help point you to all the resources you need to get started!
- See a video of Java SE Embedded on LEGO® Mindstorms® EV3.
- Guide on how to run Java on Lego EV3 via leJOS wiki (not affiliated with LEGO® or Oracle).
- More information about Java on LEGO® Mindstorms® can be found at the leJOS community site (not affiliated with LEGO® or Oracle).
- The leJOS community is working on enabling LeJOS on MINDSTORMS EV3. Oracle is making our Java implementation available here to support their efforts. For now, please consult the leJOS forums for status and updates.
- If you’re feeling adventurous after reading up some of the above links, Download either the Java SE Embedded 8 ARMv5 port or Java SE Embedded 7 Update 51 ARMv5 port (see below).
- Java SE Embedded 8 enables developers to create customized JREs using the JRECreate tool. Starting with Java SE Embedded 8, individual JRE downloads for embedded platforms are no longer provided. To get started, download the bundle below and follow instructions to create a JRE that suits your application’s needs.
Oracle Java SE Embedded version 8
Product / File Description
File Size
Download
Oracle Java SE Embedded version 7 Update 60
Product / File Description
File Size
Download
More Information
NOTICE
LEGO, the LEGO logo, MINDSTORMS and the MINDSTORMS logo are trademarks of the/sont des marques de commerce de/son marcas registradas de LEGO Group. ©2014 The LEGO Group.