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Introduction to LEGO NXT robotics and Robot Sumo for

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1 Introduction to LEGO NXT robotics and Robot Sumo for
CJ Chung Associate Professor of Computer Science Founder and Director of Robofest Lawrence Technological University

2 This program is possible thanks to:
a grant from Detroit Auto Dealers Association (DADA) Charitable Foundation Fund, which is a fund of the Community Foundation for Southeast Michigan. For more details, check out a press release at:

3 Schedule First Workshop Day (3 hours) Second Workshop Day (3 hours)
Third Workshop Day (2 hours) Meetings with your school staff/teachers to improve your sumoBot (3 hours x 2 meetings suggested) Official Competition at your school to select one team to advance to the World Robofest Championship on April 26. General public to be invited.

4 Workshop First Day (3 hours)
Introduction to Robotics Introduction to Robofest and Robot Sumo Introduction to Lego NXT Introduction to NXTG Basic programs Motors Wait Turns

5 Introduction to Robotics
What is a true robot? autonomous robot with an on board computer Mechanical, electrical, and computational components Six fundamental components of a robot A brain or brains – computer Body: physical chasses that holds other pieces Actuators: motors, hydraulic pistons, pneumatics Sensors Power sources Communication mechanism

6 What is Robofest? 100% Autonomous Affordable
Challenging: Unknown problem No direct adult help allowed during the competition Qualifiers and a World Championship Various categories including Robot Sumo Two divisions: 5th – 9th grade: Jr. Division 9th – 12th grade: Sr. Division

7 RoboSumo Push the other robot out of the Sumo ring

8 Specifications Junior Division Senior Division Sumo ring diameter
Junior Division Senior Division Sumo ring diameter 77 cm (30 inches) 122 cm (48 in) Maximum robot mass 1kg (2.2 lbs) 2 kg (4.4 lbs) Maximum robot width and length 23 cm (9 inches) 30 cm (11.75 inches) Maximum robot height no limit Robot type Any; Lego Mindstorms or NXT recommended. any

9 Why Sumo? The most popular robot competition in the world
Integrator in Science Education – Math, Logic, Computers, Mechanics, and Physics Good for rookie teams Fun Motivator

10 Unknown Problem in Robofest Sumo
How to start is unknown Need sensor(s) Teams must bring a computer to program the unknown parts

11 Introduction to Lego NXT
Brain – RCX micro computer Body: Lego Technic pieces Actuators: up to 3 motors Sensors: Light, touch, US, Sound, etc. Power source: 9V (six AA batteries or rechargeable battery pack) Communication mechanism: USB or Blue Tooth

12 Introduction to “SB2 (Sumo Bot 2)”
Left motor: A Right motor: C Touch: 1 Light: 3 Ultra Sonic (distance): 4

13 Introduction to NXTG Programming
Please go through Getting Started and Software Overview after this class

14 First NXT program: Go forward for 2 sec. and stop
Let’s name the program first Click on Go >> button You’ll see a programming palette (canvas)

15 First NXT program using SB1: Go forward for 2 sec. and stop (2/3)
Click on Move button Drag and drop the move block to the canvas

16 First NXT program using SB2: Go forward for 2 sec. and stop (3/3)
Change parameters for the Move Port Direction Steering Power Duration Next Action Block Configuration Panel

17 How to run your first program (1/2)

18 How to run your 1st program (2/2)
If “Found New Hardware” pops up, just follow the instruction Click on “Download” button Recommended to un-plug the cable from the Bot Press the orange button 4 times (Turn on, My files, Software files, Run your program entitled go2stop)

19 How to rerun the program
Check the program name on the LCD Press the orange button just once again

20 How to stop the program Gray button

21 First NXT Program: Go forward for 2 sec. and stop (Review)

22 Do not forget: Save your programs Meaningful file (program) names
Use comments

23 2nd Program: ForwardBack
Go Forward 2 rotations Wait 3 seconds, then Backward 1 rotation

24 Go Forward 2 rotations, Wait 3 seconds then Backward 1 rotation – ForwardBack

25 Making Turns Turn left Spin left Face left stop Left wheel Right wheel

26 Turn90Left – Using a Motor Block!
Forward 2 rotations, Turn Left 90 Degrees, and Forward 2 rotations

27 Forward 2 rotations, Turn Left 90 Degrees, and Forward 2 rotations – Turn90Left

28 How do we make to turn 90 degrees?
Timer? Trial errors Let’s do the math!!! Width of the robot: 14 cm Diameter of the wheel: 5.5 cm Perimeter of the wheel: 5.5 cm x pi = 17.27 23.55 / = Travel distance needed: (14 x 2 x pi) / 4 = cm Number of rotations needed? 21.98 / = 14 cm

29 How about 180 degree turns using a motor block?
Forward 2 rotations, Turn Right 180 Degrees, and Forward 2 rotations 14 cm What is the rotation value for the Motor Block? 1.27 x 2

30 “Spin” 180 degrees using Move/Steering
Forward 1 rotation, Spin right 180 degrees Forward 1 rotation Travel distance needed: (14 x pi) / 2 = cm 14 cm Number of rotations needed? 21.98 / =

31 Spin180right

32 Class Challenge: A Simple Maze
Start line box box Place a business card as a target point to reach

33 Online Resources great tutorial on how to program in NXTG with more information than you could ever want about LEGO robots and programming; a great place to ask questions

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