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首页LEGO Mindstorms Java编程入门指南：实战技术教程

LEGO Mindstorms Java编程入门指南：实战技术教程

Beginning

Robotics

Programming

Java

LEGO

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"《使用Java进行LEGO Mindstorms入门机器人编程：技术在行动》是一本由Wei Lu编著的专业书籍，专为那些想要踏入机器人技术领域并利用LEGO Mindstorms平台学习编程的读者设计。本书旨在通过Java编程语言引导读者探索和实践机器人技术，将理论知识与LEGO Mindstorms硬件相结合，让学习者在实践中提升技能。本书的特点在于其互动性和实用性，它适合初学者，无论是否有编程背景，都能从基础的编程概念开始，逐步深入到编写控制机器人运动、感知环境和执行任务的代码。作者使用清晰易懂的语言，配合LEGO Mindstorms套件的操作指南，帮助读者理解并应用面向对象编程、传感器读取、逻辑控制等核心概念。书中不仅包含了大量的实例和项目，还涵盖了如何使用Java API来操控机器人的电机、颜色传感器、超声波传感器等组件，以及如何处理数据、实现远程通信和连接无线设备。此外，读者还能学到如何利用软件工具如Arduino IDE进行编程，以及如何将程序部署到LEGO Mindstorms EV3控制器上。版权方面，本书受法律保护，所有权利归Wei Lu所有，包括翻译、复制、再版、改编、传播和存储等，除非得到出版商明确许可。书中提及的商标、标志和图像仅用于编辑目的，以展示相关产品，并尊重知识产权。通过阅读《使用Java进行LEGO Mindstorms入门机器人编程》，读者不仅可以提升编程能力，还能培养创新思维和问题解决能力，为未来在人工智能、物联网等领域打下坚实的基础。这是一本既适合个人自学，也适用于学校或培训机构教学的优秀资源。"

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CHAPTER 1 ■ INTRODUCTION TO LEGO MINDSTORMS AND LEJOS

Lego Mindstorms NXT

• JVM for NXT Brick

• leJOS API for NXT brick

• leJOS PC Communications

• leJOS JavaME Communications

• leJOS Tools

Lego Mindstorms RCX

• JVM for RCX Brick

• leJOS API for RCX brick

• leJOS PC Communications

• leJOS Tools

In this book, we are focused on the most recent Lego Mindstorms product: that is, Lego Mindstorms

EV3. Typical official packages provided by leJOS for the EV3 brick are illustrated in Table

1-1 . These packages

allow you to manage the EV3 brick, sensors, and actuators, as well as some other pieces of EV3 hardware.

Table 1-1. EV3 brick packages

Package Description

lejos.hardware To support EV3 hardware

lejos.hardware.ev3 To access EV3 hardware

lejos.hardware.lcd To access EV3 LCD

lejos.hardware.motor To access EV3 motors

lejos.hardware.port To access EV3 ports

lejos.hardware.sensor To access all the sensors that are supported on the EV3

lejos.hardware.video To access video devices

Table

1-2 lists packages that offer support for some robotics problems, such as localization and

navigation.

Table 1-2 . Robotics/AI packages

Package Description

lejos.robotics.localization Localization support

lejos.robotics.mapping Support for maps

lejos.robotics.navigation Navigation classes

lejos.robotics.objectdetection Object detection classes

ejos.robotics.subsumption Support for subsumption architecture

CHAPTER 1 ■ INTRODUCTION TO LEGO MINDSTORMS AND LEJOS

All leJOS releases have documentation on the packages in the format of Javadoc. Details on the

packages provided in leJOS EV3 can be found at:

http://www.lejos.org/ev3/docs/ .

Figure

1-2 shows the leJOS EV3 development documents .

Figure 1-2. leJOS development documents

JDK Installation

The leJOS project is based on Java technology, so you need to install the Java Development Kit (JDK) current

release on your local computer. The JDK release can be found at:

http://www.oracle.com/technetwork/

java/index.html

A Java Runtime Environment (JRE) is not sufficient, as it does not allow you to compile Java programs.

leJOS EV3 only works with a 32-bit version of the JDK and JRE , so even if you have a 64-bit system, you

should select a 32-bit version of the JDK. Also leJOS EV3 has been tested with JDK versions 1.7, and thus Java

7 is recommended in this book. As an example, the following steps show you how to install JDK using the

Java JDK installer called jdk-7u45-windows-i586.exe .

CHAPTER 1 ■ INTRODUCTION TO LEGO MINDSTORMS AND LEJOS

INSTALLING THE JDK

1 . Double-click the file jdk-7u45-windows-i586.exe , and you will see the screen

shown in Figure 1-3 . Then, click the Next button.

Figure 1-3. Step 1 of the JDK Installation

2 . Install the JAVA JDK to the path C:\Program Files (x86)\Java\jdk1.7.0_45 ,

choose all components, and click the Next button, as illustrated in Figure

1-4 . It will

then install JDK components that you chose.

CHAPTER 1 ■ INTRODUCTION TO LEGO MINDSTORMS AND LEJOS

3 . Click the Close button, as shown in Figure

1-5 . The JAVA JDK is then successfully

installed on your computer at: C:\Program Files (x86)\Java\jdk1.7.0_45 .

Figure 1-4. Step 2 of the JDK installation

Figure 1-5. Step 3 of the JDK installation

4 . Once you have installed the J2SE SDK on your computer, it is necessary to check

that you can compile and execute any java program.

CHAPTER 1 ■ INTRODUCTION TO LEGO MINDSTORMS AND LEJOS

Testing the JDK Installation

Open a Shell console on your computer, and type the command Java :

• Java : Java command used to execute Java programs

• Javac : Java command used to compile Java programs

The reason to perform the first test is because you need to check that your operating system recognizes

the command java , which is used to execute Java programs. If the shell console returns the options to use

the command, as shown in Figure

1-6 , then the test is a success.

Figure 1-6. Test running the java command

The second test is necessary to know if your operating system recognizes the command javac , which

is used to compile your programs. Type javac on your keyboard and check the message. If your system

doesn’t recognize the command, then you have to update environment variables in your computer system.

Right-click on your "My Computer" icon and select properties . Click on the tab advanced options . When you

click this command, you will see a new window where you can update the variable path. This path is used to

execute commands directly from a Shell keyboard.

On the tab Advanced options tab, click on the Environment variables button, as shown in Figure

1-7 .

The path variable is located in the System variables area. Find the variable path , and click the Update button.

Path variables may have many statements because they are used by many applications.

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