This document provides information about using Lego EV3 robots with LeJOS, including how to set up the software and connect to the EV3 brick from Windows. It describes the hardware components of the EV3 brick and various sensors. It also includes steps to build a wind turbine project with a fan, light sensor, and motors to rotate the turbine and fan. Code examples are provided to control the motors and read the light sensor.

1. Devoxx4Kids
Lego Kids Workshop
Stephen Chin
Java Community Manager
JavaOne Content Co-Chair
@steveonjava

2. LeJOS
How it works on the EV3

3. The Heart of the EV3
> TI Sitara AM1808
 ARM9, 300Mhz
> 64MB RAM / 16MB Flash
> Analog to Digital Converter
> 4 Motor Ports
> 4 Sensor Ports
> Bluetooth / USB
> MicroSD

4. EV3 Motors

5. EV3 Sensors

6. Color and Light Sensor

7. High frequency
sound waves
Measuring mode Vs Presence Mode
Ultrasonic Sensor

8. Infrared Sensor

9. Remote Control

10. Getting Started with LeJOS
> Micro SD Card (> 2GB)
> Compatible WIFI adapter
 NetGear WNA1100
 EDIMAX EW-7811Un
> Linux (or a Linux VM)
> Details here:
Creating Your SD Card
http://sourceforge.net/p/lejos/wiki/Home/

11. Lego Duke Segway

12. Windows USB Connection
Step 1: The wrong driver gets installed, so we need to fix this in the
Device Manager
13Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

13. Windows USB Connection
Step 2: In Device Manager, find your EV3’s RNDIS device. It is
under Network Adapters > USB Ethernet/RNDIS Gadget.
14Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

14. Windows USB Connection
Step 3: Double-click it and select the Drivers tab. Click Update
driver… to change the driver.
15Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

15. Windows USB Connection
Step 4: Select Browse my computer for driver software.
16Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

16. Windows USB Connection
Step 5: Click Let me pick from a list of device drivers on my computer.
17Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

17. Windows USB Connection
Step 6: Uncheck the box that says Show compatible hardware. In
the Manufacturer list, pick Microsoft Corporation (in Windows 8,
pick Microsoft). In the Network Adapter list, pick Remote NDIS
Compatible Device. Then click Next.
18Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

18. Windows USB Connection
Step 7: Windows thinks we don’t know what we are doing, but really
we do, so click Yes.
19Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

19. Windows USB Connection
Step 8: When it is done installing, click Close.
20Credit to the ev3dev team for the great screen captures and writeup: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/?tabs-0=windows-7-8

20. Eclipse Setup
> Open Eclipse
> Go to "Preferences"
> Click on leJOS EV3
> Change the brick name to
the IP address of your brick
 (default is 10.0.1.1)
21

21. Creating a New LeJOS Project
> Go to "File" > "New" > "Project…"
> Choose a LeJOS EV3 Project
22

22. Create a Class File
> Create a new class ("File" > "New"
> "Class")
> Give it a package (e.g. sample)
> Give it a name (e.g. LCDTest)
23

23. Simple LeJOS Application
public class EV3FirstProgram {
public static void main(String[] args) {
LCD.clear();
LCD.drawString("First EV3 Program", 0, 5);
Button.waitForAnyPress();
LCD.clear();
LCD.refresh();
}
}

24. Stephen Chin
tweet: @steveonjava
blog: http://steveonjava.com
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25. Parts you will need Step 1
Assemble Brace

26. Step 2 Completed Brace
Assemble Brace

27. Parts you will need Step 1
Build Base

28. Step 2 Completed Base
Build Base

29. Motor parts Snap them on partially
Assemble Motor

30. Take motor and base And connect them like this
Assemble Motor

31. Foot parts Step 1
Add a Foot

32. Step 2 Add the Foot to the Base
Add a Foot

33. Assembled Foot and Base
Add a Foot

34. Lock parts Partially insert the red attachers
Add a Lock

35. Attach the lock Push down the red attachers to secure
Add a Lock

36. Tower parts Step 1 – push the rod all the way through
Construct the Tower

37. Step 2 Attach the Tower to the Base
Construct the Tower

38. Completed Tower
Construct the Tower

39. Fan Motor parts Step 1
Build the Fan Motor

40. Completed Fan Motor
Build the Fan Motor

41. Light Sensor parts Step 1
Construct the Light Sensor

42. Completed Light Sensor
Construct the Light Sensor

43. Fan Blade parts Step 1
Assemble the Fan Blades

44. Fan Blade, Light Sensor, and Fan Motor Completed Fan
Assemble the Fan

45. Assembled Wind Turbine
46

46. Wind Turbine Wiring
> Port A – Medium Moto
 Power Fan
> Port B – Large Motor
 Rotate Wind Turbine
> Port 1 – Light Sensor
 Track Ambient Light
47

47. Gear Box parts Step 1
EC: Gear Box Construction

48. Completed Fan with Gear Box
EC: Gear Box Construction

49. Making the Wind turbine turn
public class WindTurbine {
public static void main(String[] args) {
EV3MediumRegulatedMotor fan =
new EV3MediumRegulatedMotor(MotorPort.A);
fan.setSpeed(1500);
fan.setAcceleration(150);
fan.backward();
Delay.msDelay(10000);
}
}

50. Making the Tower spin
public class WindTurbine {
public static void main(String[] args) {
EV3LargeRegulatedMotor base =
new EV3LargeRegulatedMotor(MotorPort.B);
base.setSpeed(80);
base.rotateTo(-90);
base.rotateTo(90);
}
}

51. Checking the Ambient Light
public class WindTurbine {
public static void main(String[] args) {
EV3ColorSensor light =
new EV3ColorSensor(SensorPort.S1);
float[] sample = new float[1];
SensorMode mode = light.getAmbientMode();
mode.fetchSample(sample, 0);
LCD.drawString("Light = " + sample[0], 0, 4);
Delay.msDelay(5000);
}
}

52. Putting it all together…
> Can you write a program that will:
1. Rotate the fan in a circle
2. Check the ambient light while rotating
3. Move back to the brightest angle
4. Spin the fan
http://commons.wikimedia.org/wiki/Wind_generator#mediaviewer/File:Eolienne_et_centrale_thermique_Nuon_Sloterdijk.jpg

53. Stephen Chin
tweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour

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