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5th Annual
Robofest 2004
Informational Meeting
Mar. 20, 2004
Chan Jin Chung
Ali Khazaal
Jason Lo
Computer Science
Lawrence Technological University
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Agenda
• Introduction to Robofest and Game Rules
 Go to www.robofest.net and click on
Announcement link
 Tech Resource link
• 9:15am: NQC Installation and Basics
• 10:45am: Java, LeJos, Eclipse setup
• Announcements
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NQC installation
• You must install RIS or RoboLab software
to install the drivers for your IR tower.
• Tech Resource or CD-ROM given today
• Bricxcc 3.3.7.7
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NQC
• NQC complier – David Baum
• Brick Command Center (bricxcc) – IDE
tool
• Tutorial: www.robofest.net TechResource
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The first NQC program
task main()
{
OnFwd(OUT_A);
OnFwd(OUT_B);
Wait(400); // 4 sec
OnRev(OUT_A+OUT_B);
Wait(400);
Off(OUT_A+OUT_B);
}
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Control Structures
•
•
•
•
•
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repeat(n)
while
if
if else
do while
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Using variables
#define TURN_TIME
int move_time;
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// define a variable
task main()
{
move_time = 20;
// set the initial value
repeat(50)
{
OnFwd(OUT_A+OUT_C);
Wait(move_time); // use the variable for sleeping
OnRev(OUT_C);
Wait(TURN_TIME);
move_time += 5;
// increase the variable
}
Off(OUT_A+OUT_C);
}
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Sensors
task main()
{
SetSensor(SENSOR_1,SENSOR_TOUCH);
OnFwd(OUT_A+OUT_C);
until (SENSOR_1 == 1);
Off(OUT_A+OUT_C);
}
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A Simple Line Following
#define THRESHOLD 40
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task main()
{
SetSensor(SENSOR_2,SENSOR_LIGHT);
OnFwd(OUT_A+OUT_C);
while (true)
{
if (SENSOR_2 > THRESHOLD)
{
OnRev(OUT_C);
Wait(10); // make smooth movement
until (SENSOR_2 <= THRESHOLD);
OnFwd(OUT_A+OUT_C);
}
}
}
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Why Java?
• Write once, run anywhere
• Professional OO software development
• AP exam from C++ to Java, 2004-
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Install Java, LeJos, and Eclipse!
Acknowledgement: Based on web page created by Jason Chien-Tai and updated
by Tim Cahoon, a robofest coach
1. Install RCX or Robolab software to install the drivers
for your Infrared Tower. RCX v1.X only supports the
serial tower. RCX 2.x supports both the serial and USB
versions of the Tower (You can skip this step if you have
already installed RCX or Robolab)
2. Download Java J2SE SDK from
http://java.sun.com/j2se/1.4.2/download.html
Install the program by running it. This may take 4-5
minutes to install. (Windows 98 users may need to use
the older 1.3.x version if there errors
installing the newest version)
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3. Dowload leJOS from
4.
5.
6.
7.
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http://lejos.sourceforge.net/download.html
(Start with Version 2.xx)
Extract downloaded leJOS ZIP file to a directory
(eg.C:\lejos) When
doing the unzip, specify unzip to C:\. The zip file will
build the lejos
directory for you.
Download eclipse from
http://www.eclipse.org/downloads/index.php
(With Latest Release Start with Version 2.xx)
Extract downloaded eclipse ZIP file to a directory (eg.
C:\eclipse)
When doing the unzip, specify unzip to C:\. The zip
file will build the eclipse directory for you.
Download the following zip-bundle
org.lejos_1.0.2.zip
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8. Unzip it into your eclipse plugin
directory. (The files go into
c:\eclipse\plugins )
9. Start eclipse by double-clicking eclipse.exe
under C:\eclipse
(Double-click again if eclipse is not started)
HINT: Make a shortcut for eclipse and put it on
your desktop.
10. When eclipse is running, go to the leJOS
preference page, using
Window->Preferences->Lejos page or Lejos>Preferences.
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• Lejos Installation Directory = C:\lejos (where
you installed Lejos files)
RCX comm port = com1, com1, USB (depends
on how infrared tower is connected)
Data Transfer Rate = fast, slow (select fast. If you
have problems try slow)
• If lejos is not listed on the bar (with file, edit,
source, etc..) at the
top of eclipse, the lejos plugins were not put in
the right directory. (
eclipse\plugins is where the files go). Exit eclipse
and redo step 8 again.
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How to write a LeJos Java
Program using Eclispe
• Create a project: File -> New -> Project
• Highlight leJOS Project and click Next (or
double click leJOS Project)
• Type in your Project Name and Click on
Finish
• Create a Java class file: File -> New ->
Other; double click on Class
• Type a Java class name; check public static
void main() and click on Finish
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Compile, download, and run
• Save the file (compile is done)
• Select: leJOS -> firmware download (for
the first time run, takes more than 5 min)
• Select: leJOS -> bytecode download to
download your program
• Press the green Run button to execute
your program
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Announcement
1010
4-3-03:
RCX code and RoboLab
Workshop
4-17-03
Warm-up Competition
at Cranbrook Institute of
Science.
Only for 10 teams
We need referees!
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