Lego Mindstorm EV3 -> Java8, LeJOS and Gradle with taste of Maven
Img.1. - Let's turn on the LegoBrick again and make remote project based on Gradle
The previous post about Lego MindStorm EV3 has been focused on its installation. I've touched how to install JavaJDK setup Wifi on LegoBrick + small sample "hello world" project. This blog post is about setting up little more advanced project. The simple HelloWorldGradle Remote project uses:
The legoBrick, connected to the WiFi, is possible to access remotely without problem using Java Remote Method Invocation, shortly RMI.
RemoteEV3 ev3Brick = new RemoteEV3(EV3BRICK_IP);
ev3Brick.setDefault();
Before we start working on the sample source code we create Gradle project. We can randomly choose the project as HelloWorldGradle. Important is to setup Gradle property file "build.gradle" correctly
jar library "ev3classes" is very important! This library creates the gateway into the lego hardware by using RMI because EV3 acts as the RMI Registry. You need to create it by yourself.
This library can be created by maven with usage of maven-assembly-plugin. The final *.jar file can then easily imported into the local maven cache. Now we are ready to remotely access our Lego MindStorm robot and in our case let him to play some short song.
RemoteEV3 ev3Brick = new RemoteEV3(EV3BRICK_IP);
ev3Brick.setDefault();
Audio soundProcessor = ev3Brick.getAudio();
List tones = new ArrayList<>(asList(0,1,2,3,4,5));
tones.forEach(tone -> {
soundProcessor.systemSound(tone);
});
The sample LejOS remote project HelloWorldGradle is available here (GITHub). Enjoy !
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