devoxx4kids lego workshop
TRANSCRIPT
Devoxx4KidsLego Kids Workshop
Stephen Chin
Java Community Manager
JavaOne Content Co-Chair
@steveonjava
LeJOSHow it works on the EV3
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
EV3 Motors
EV3 Sensors
Color and Light Sensor
High frequency
sound waves
Measuring mode Vs Presence Mode
Ultrasonic Sensor
Infrared Sensor
Remote Control
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/
Lego Duke Segway
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
Windows USB ConnectionStep 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
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
Creating a New LeJOS Project
> Go to "File" > "New" > "Project…"
> Choose a LeJOS EV3 Project
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
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();
}
}
Stephen Chintweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour
Hacking Time!
Parts you will need Step 1
Assemble Brace
Step 2 Completed Brace
Assemble Brace
Parts you will need Step 1
Build Base
Step 2 Completed Base
Build Base
Motor parts Snap them on partially
Assemble Motor
Take motor and base And connect them like this
Assemble Motor
Foot parts Step 1
Add a Foot
Step 2 Add the Foot to the Base
Add a Foot
Assembled Foot and Base
Add a Foot
Lock parts Partially insert the red attachers
Add a Lock
Attach the lock Push down the red attachers to secure
Add a Lock
Tower parts Step 1 – push the rod all the way through
Construct the Tower
Step 2 Attach the Tower to the Base
Construct the Tower
Completed Tower
Construct the Tower
Fan Motor parts Step 1
Build the Fan Motor
Completed Fan Motor
Build the Fan Motor
Light Sensor parts Step 1
Construct the Light Sensor
Completed Light Sensor
Construct the Light Sensor
Fan Blade parts Step 1
Assemble the Fan Blades
Fan Blade, Light Sensor, and Fan Motor Completed Fan
Assemble the Fan
Assembled Wind Turbine
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
Gear Box parts Step 1
EC: Gear Box Construction
Completed Fan with Gear Box
EC: Gear Box Construction
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);
}
}
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);
}
}
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);
}
}
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
Stephen Chintweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour
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