Set up the Environment for leJOS NXJ

Required Software

• Software– JDK 1.6– leJOS NXJ– USB driver for NXT

• Mindstorm nxt USB driver • Libusb

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leJOS Installation

• The following instructions are written for Windows XP.

• Extract lejos_NXJ_win32_0_6_0beta.zip to your desired directory. (ex: C:\lejos_nxj)

• Execute jdk-6u10-windows-i586-p.exe and install JDK on your computer.

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leJOS Installation cont’d

• Install mindstorm nxt USB driver• Execute libusb-win32-filter-bin-0.1.12.1.ex

e to install the USB driver• For Vista user, you need additional steps

– Right click on this file. Select Properties | Compatibility Click the "Run this program in compatibility mode" box and select "Windows XP (Service Pack2)" from the drop down list.

– Right click again and select "Run as Administrator". Follow the installation instructions. Run the test program will list the usb devices plugged into your computer, but not new devices.

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Environment variable

• 控制台 >系統 >進階 >環境變數• NXJ_HOME: Your leJOS directory

(ex: C:\lejos_nxj)

• JAVA_HOME: Your JDK directory(ex: C:\Program Files\Java\jdk1.6.0_07)

• You can reference pictures on the next page

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Environment variable cont’d

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Environment variable cont’d

• Add Path for JDK and leJOS• C:\lejos_nxj\bin;C:\Program Files\Java\jdk1.6.0_07\bin

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Flash the firmware

• NXT must be plugged into the USB and turned on first.

• Press the reset button (at the back of the NXT , upper left corner) for more than 4 seconds. Your NXT will audibly tick when it is firmware update mode.

• 開始 >執行 >cmd– Command: C:\lejos_nxj\bin\nxjflash

Then the firmware will be updated.

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Flash the firmware cont’d

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First program

• Open Notepad and enter the following code:

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First program cont’d

• Open cmd and cd to the directory containing your HelloWorld.java (ex: cd C:\lejos_nxj\code)

• Compile: nxjc HelloWorld.java• Upload to NXT: nxj –r HelloWorld

– Without –r, the program will not run after uploading and you can run it on NXT yourself.(Make sure NXT is turned on before uploading)

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Lab1

• Reference the first program and write a program to show all the student numbers of your group members.

• NOTE: You can turn off the NXT by pressing the orange and dark gray buttons (ENTER + ESCAPE) together.

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