JCrete Embedded Java Workshop

JCrete Embedded Java Hacking Stephen Chin Java Technology Ambassador JavaOne Content Chair @steveonjava

Java and 3G in a Tiny Package > Cinterion EHS5

http://upload.wikimedia.org/wikipedia/commons/3/3d/Cloud_forest_Ecuador.jpg

= Have Java With Your Dessert Raspberry Pi

Chalkboard Electronics Touchscreen  10" or 7" Form Factor  Connects via HDMI/USB  Tested with JavaFX 8  10% Exclusive Discount: G1F0U796Z083

How to Setup Your Pi > Step 1: Install Linux > Step 2: Download/Copy Java 8 for ARM > Step 3: Deploy and Run JVM Language Apps http://steveonjava.com/ javafx-on-raspberry-pi-3-easy-steps/

Electronic Safety! > Unplug from wall before wiring > Get rid of static by touching a metal surface > Don't touch exposed wires/metal > Never remove/insert SD Card while power is on 11

What Comes in Your Lab Kit 1. Touch Screen 2. SD Card 3. Keyboard 4. Yellow Box:  Power Adapter  LVDS Cable/Board  Raspberry Pi Model B  Mini-USB Cable (power) Please Save All the Packaging for Later

Hooking Up the Pi (Part A) 1. Insert the SD Card in to the Pi  Will appear upside down when looking at the top of your Pi 2. Insert the HDMI board into the Pi's HDMI jack 3. Connect the Pi power to the HDMI board  Use the Micro USB Cable (short one) 13 Important: Connect everything before plugging into the wall

Hooking Up the Pi (Part B) 4. Slide the LCD cable into the back of the display  Side with gold connectors goes up  Be careful, the connector is fragile! 5. Hook up the USB keyboard 6. Connect the USB end to one of the Pi's USB host ports  This provides touch input 14 Verify connections and plug into power now

Is it Working? > Should get a bunch of flashing LEDs to indicate booting  Boot takes approx 30 seconds > The LCD screen should light up  Might be dim if the light sensor is obstructed > And you will should see a Linux boot screen with lots of text

Logging In At the login prompt type your username: > pi And enter the password: > raspberry

Running the JavaFX Sample Application Change directory to the project folder > cd MaryHadALittleLambda Run the build script > ant

Hacking the Code Run the nano text editor: > nano src/sample/MapObject.java Save your changes: > Control-O Enter Exit Nano: > Control-X Compile/Run: > ant

Mary Had a Little Lambda Project > Open-source project to demonstrate lambda features > Visual representation of streams, filters, and maps 20 https://github.com/steveonjava/MaryHadALittleLambda

Stuff to do… > Changes to MaryHadALittleLambda:  Change the number of sheep  Make the rainbow have different colors  Change the fox size to be fatter/skinnier  Add new graphics (additional image files under images/extra) 21 camel.png lion.png greendragon.png cow.png Brownbear.png

Wiring LEDs > Wire the elements in series:  Connect the long end of the LED to GPIO  Connect the short end of the LED to the resistor  Connect the resistor to Ground To GPIO To Ground 23

Using a Breadboard > Pins are connected horizontally in the center > The edges are connect vertically > No current passes the center line 24

Pi Cobbler > Connects your Pi to the Breadboard > The white line is Pin 1 > Connect it in the center top of your Breadboard 25

Pi4J > The samples are located in /opt/pi4j/examples > Compile the samples by typing "./build" > Instructions for running the samples are printed out at the end of the build > Pi4j needs root access to use GPIO (use "sudo") 26

ControlGpioExample 27 > Demonstrates Controlling Pins:  pin.low()  pin.toggle()  pin.pulse(duration, blocking) > Try creating your own pattern! sudo java -classpath .:classes:/opt/pi4j/lib/'*' BlinkGpioExample

Wiring Buttons > Connect a circuit across two legs > While the button is pressed…  The legs numbered 1 and 2 are connected  The legs numbered 3 and 4 are connected 28

ListenGpioExample 29 > Demonstrates Listening to a pin:  addListener(pinListener) > Change the message/action when a button is pressed! sudo java -classpath .:classes:/opt/pi4j/lib/'*' ListenGpioExample

BlinkGpioExample 30 > Use LEDs and Buttons together! sudo java -classpath .:classes:/opt/pi4j/lib/'*' BlinkGpioExample

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

High frequency sound waves Ultrasonic Sensor Measuring mode Vs Presence Mode

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

Bluetooth Pairing > Make sure your Lego is turned on > Open "Devices and Printers" from the Start menu > Click "Add a device" > Select the Lego brick > After pairing, right click on the new device and choose "Connect using" > "Access point"

Eclipse Setup > Open Eclipse > Go to "Preferences" > Click on leJOS EV3 > Change the brick name to "10.0.1.1" 41

Creating a New LeJOS Project > Go to "File" > "New" > "Project…" > Choose a LeJOS EV3 Project 42

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) 43

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

Assemble Brace Parts you will need Step 1

Assemble Brace Step 2 Completed Brace

Build Base Parts you will need Step 1

Build Base Step 2 Completed Base

Assemble Motor Motor parts Snap them on partially

Assemble Motor Take motor and base And connect them like this

Add a Foot Step 2 Add the Foot to the Base

Add a Foot Assembled Foot and Base

Add a Lock Lock parts Partially insert the red attachers

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

Construct the Tower 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

Build the Fan Motor Fan Motor parts Step 1

Build the Fan Motor Completed Fan Motor

Construct the Light Sensor Light Sensor parts Step 1

Construct the Light Sensor Completed Light Sensor

Assemble the Fan Blades Fan Blade parts Step 1

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

Wind Turbine Wiring > Port A – Medium Moto  Power Fan > Port B – Large Motor  Rotate Wind Turbine > Port 1 – Light Sensor  Track Ambient Light 66

EC: Gear Box Construction Gear Box parts Step 1

EC: Gear Box Construction Completed Fan with Gear Box

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

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